Silicone Structural Glazing

7/30/2019 Silicone Structural Glazing

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SILICONE STRUCTURAL

GLAZING MANUAL


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IMPORTANT INFORMATION

Th t ctd h d d th d D C

ch d d t cct. H, c cdt d thd

dct yd ct, th t h t d

ttt ct tt t tht D C dct

y tcty y cc ct. D C ty

tht th dct t t ct cct. Y c dy ch ch ty td t d ch c ct

y dct h t th th td.

Dow Corning speCifiCallY DisClaims anY oTHer express or

implieD warranTY of fiTness for a parTiCular purpose or

merCHanTabiliTY. unless Dow Corning proviDes You wiTH

a speCifiC, DulY signeD enDorsemenT of fiTness for use,

Dow Corning DisClaims liabiliTY for anY inCiDenTal or

ConsequenTial Damages. suggesTions of use sHall noT be

Taken as inDuCemenTs To infringe anY paTenT.


3/52

Silicone Structural Glazing Manual

Contents

Introduction.......................................... 5 Project Review.............................................5

D r ...........................................5

stt d mt a ...............5

Product Quality............................................5Jt pt d st act .5

qty Ct ..........................................5

Dctt ...........................................5

Dow Corning Product Offering........... 6 Structural Glazing Silicone Sealants ...........6

Dow Corning 993 Structural Glazingsc st ..........................................6

Dow Corning 895 Structural Glazingsc st ..........................................6

Insulating Glass Silicone Sealants ...............6Dow Corning 3362 it g

sc st ..........................................6

Dow Corning 3793 it g

sc st ..........................................6

Weatherproong Sealants ............................7Dow Corning 756 sms

bd st .........................................7

Dow Corning 791 sc

Weatherproong Sealant ............................7Dow Corning 757 s Hyd d

Weatherproong Sealant forphtctytc C g ........................7

Dow Corning 797 sc

Weatherproong Sealant ............................7 Cleaners and Primers ...................................7

Dow Corning r-40 C .......................7

Dow Corning 3522 C st

Ccttd ..............................................7

Dow Corning 1200 os p ...................7

Dow Corning p C ..............................7

Dow Corning p p ...............................7

Project Review...................................... 8

Dow Corning Project Support .....................8 Product Recommendation ...........................8

D r ...........................................8

stt d mt a ...............8

adh Tt....................................8

Ctty Tt .............................9

n-st Tt ..................................9

oth lty Tt .......................9

s s ................................9

wty .................................................9

Project Workow Diagram ........................10 Structural Glazing Design .........................11

e Tchc a (eTa) .......11

European SG Project ChecklistCct Coins ................................11

Structural Glazing Joint Dimensioning .....12Structural Glazing Terminology...............12

stct bt ......................................12

Thickness .............................................12Structural Glazing Joint Dimensioninggd ................................................12

wdd d g D ...........14

stct bt Cct

wdd d g D ...........14

Th Dtt ...............................14Glueline Thickness Calculation forTh Dtt ...............................14

Ddd ..............................................15

stct bt Cct

Ddd.........................................15Structural Glazing System Types .............16

4-Sided Structural Glazing...................162-Sided Structural Glazing...................16Slope Glazing.......................................16

std g .......................................16U-Prole Systems ................................16Tt v syt ............................16

oth syt Ty .................................17

stct g syt......................17

stct attcht n-g

mt ..............................................17

Protective Glazing................................17stt d mt stct

Glazing Applications................................18

D C e adh/Ctty gd.............................18

Aluminium Proles ..............................18st st ......................................18

ltd g...................................18


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Contents

Ctd, sd d Ttd g ......18

s-C d

ey-t-C g .............................19

Gaskets and Rubber Materials .............19

Product Quality .................................. 20 General considerations ..............................20

mt t d hd ..................20

sh ...................................................20Factory vs. Site Glazing ...........................20Jt pt d

st act ..................................20

qty Ct ........................................20

One-Component Sealants ..........................21st Tt d Cdt .......21

Skin-over time/elastomeric test................21 Two-Component Sealants..........................22

st Tt d Cdt .......22

T-Ct D et

gd ................................................22

Surface Preparation and Sealant Application....................................24

stt C pcd ..................25

n-p stt .........................25

p stt .................................25

st Cdt ..........................25

Masking................................................25T-cth c thd ..................25

stt p pcd....................26

pc th p ......................................27Site Glazing Considerations.....................27

Sealant Application and Quality Control Procedures .................................................28

st act pcd .................28

st C rt ......................28

Site Glazing Cure Requirements..............28Factory Glazing Cure Requirements........28Reglazing Procedures...............................29

Reglazing Due to Glass Breakage........29

Reglazing Due to System Failure ........30qty Ct Tt pcd ..............31g Cdt ........................31

st pdct qty Ct .....31

g Tt ...........................................32

Buttery Test......................................33s T Tt ...................................34

m rt Tt...............................35

adh d C

qty Ct Tt ...........................36

p adh Tt .............................37

H-pc Tt .......................................38

Deglaze Test .........................................41 Documentation ..........................................42

pdct d qty Ct adt .....43

mtc .............................................44

European SG Project Checklist................45SG Project Testing Submission ................46st pdct qty Ct l..47

st adh qty Ct l

(p adh Tt) ................................48

st C qty Ct l

(H-pc Tt & etc Tt) ...........49st adh d C qty

Control Log (Deglaze Test)......................50 Dow Corning Construction Sales Ofces..52


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Introduction

Silicone structural glazing is a method utilizing ac dh t ttch , t, th

t t th tct d.

wdd d th ct d th d

td th , thh

th tct c t t th tct

th d. Th c t t t

dh d ch tty th d

subjected to windload and thermal stresses.

Structural glazing (SG) is a high performancect d t c t

t th ct. oy c

t hch h dd d ttd

specically for structural glazing applicationshd d. Th Dow Corning tct

glazing sealants recommended for this applicationare identied in the next section of this manual.echDow Corning structural glazing sealant has

td e Tchc a(eTa) thh ddt tt ccd t

the current European structural glazing standard:e Tchc a gd (eTag

002). The sealants also have a CE mark whichdct cty t e hth, ty

d t tct t.

Th tdd t dc th

d d Dow Corning c

sealants in structural glazing applications. Thecdt d th d

th c Dow Corning t

structural glazing projects for over 30 years.Because structural glazing projects differ ind d, t d ct

t, th ct dd

tt. Dow Corning Tchc

sc e t t y

your specic project needs.

The success of every structural glazing project isddt th t th d

, t d Dow Corning.

Successful structural glazing projects contain thefollowing elements:

Project Review

Design ReviewDow Corning t d th

structural joint design on every project.

Substrate and Material Approval

Dow Corning t tt d

t tht ctct th tct c

sealant. Specic project testing will be requiredyDow Corning t c.

Product Quality

Joint Preparation and Sealant Application

Dow Corning joint preparation, sealant handlingd t ct cd t

cty d.

Quality Control

Dow Corning ty ct cd t

d.Dow Corning t th t

th dt chty ct .

Documentation

qty ct cd d t t

dctd y t h.

qty ct tt dd th

Dctt ct th .

i t ct th , ch

th tt t dcd t dt.


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Dow Corning Product Offering

Dow Corning t hh

c c t. ech t

developed and tested for a specic applicationd hd y d tdd

specically approved byDow Corning.Specic product information is available at.dc.c.

Structural Glazing Silicone Sealants

Th Dow Corning c t

offered for structural glazing applications:

Dow Corning 993 Structural Glazing

Silicone Sealant

Dow Corning 993 Structural Glazing Siliconest t-ct, t c, t-

c c t tdd tct

d , t d th t.

wh cd t ct -ctc t, th t c t

Dow Corning 993 cd dct

of structurally glazed curtainwall units.Dow Corning 993 hh d t th

ct dh t d t.

Dow Corning 993 h td e

Tchc a (eTa) d ddt

tt ccdc th th ct e

structural glazing guideline ETAG-002. Thedct h td Ce- d

th .

Dow Corning 895 Structural Glazing

Silicone Sealant

Dow Corning 895 Structural Glazing Siliconest -ct, t-c

c t tdd tct d

, t d th t.Dow Corning895

hh d t th ct dh

t d t.Dow Corning895 h

td e Tchc a(eTa) d ddt tt ccdc

with the current European structural glazingd eTag-002. Th dct h

td Ce- d th .

Insulating Glass Silicone Sealants

Th Dow Corning sc st

d t ct.

Dow Corning it g sc st cdd t t

which are structurally glazed withDow CorningStructural Glazing Silicone Sealants.Dow Corning

it g sc st dd

d tdd t ct

y d hd d tct

glazing adhesives. For more information on the c t t

ct, t th Dow Corning

it g m hch t

.dc.c.

Dow Corning 3362 Insulating Glass

Silicone Sealant

Dow Corning 3362 it g sc

st t-ct, t c, t-

c c t tdd

secondary seal in dual glazed insulating glasst. Dow Corning 3362 it g

st h td e Tchc

a (eTa) d ddt tt

ccdc th th ct e tct

glazing guideline ETAG-002. The product has td Ce- d th .

Dow Corning 3793 Insulating Glass

Silicone Sealant

Dow Corning 3793 it g sc

st -ct, t-c

c t tdd cdy

seal in dual glazed insulating glass units.


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Dow Corning Product Offering

Weatherproong Sealants

Dow Corning oe a ull lne o hgh peoance

sealants for weatherproong applications. Following

a e decpton oDow CorningWeatherproong

sealant. Thee ealant ae degned and ntended to

weatherseal building joints and should never be used as

structural glazing adhesives. For more information on

the proper use of silicone sealants in weatherproong

applcaton, pleae ee to the Dow CorningBuilding Envelope Weatherproong Manual which

avalale at www.dowconng.co.

Dow Corning 756 SMS Building Sealant

Dow Corning 756 sms buldng sealant a one-

coponent, low odulu, and neutal-cung lcone

sealant designed specically for weathersealing

o entve utate uch a natual tone and

alunu panel yte whee the aethetc

peoance o the ealant potant. Th ealant

degned to e non-tanng on natual tone and

to attact le dt and atophec contanant

than conventonal lcone uldng ealant.

Dow Corning 791 Silicone

Weatherproong Sealant

Dow Corning 791 Silicone Weatherproong Sealant

a one-coponent, low odulu, neutal-cung

silicone sealant with a faster skinning time for

geneal weatheealng applcaton.

Dow Corning757 Si Hybrid based

Weatherproong Sealant for

Photocatalytic Clean Glass

Dow Corning 757 Si Hybrid based Weatherproong

sealant a one-coponent, low odulu ealant

degned o weathe ealng o hydophlc and

photocatalytc clean glae.

Dow Corning 797 Silicone

Weatherproong SealantDow Corning 797 Silicone Weatherproong Sealant

a one-coponent, low odulu, neutal-cung

lcone ealant wth a longe toolng te o

geneal weatheealng applcaton.

Cleaners and Primers

Dow Corning c d

that are developed specically for use withDow Corning t. i tc,

specic cleaner or primer will be required for thec t t ch t dh t

specic substrate. For general substrate cleaning

d cdt, t th Dow Corning e adh/

Ctty gd hch t

.dc.c.

Dow Corning R-40 CleanerDow Corning r-40 Cleane a pecally oulated

t d dd t c d t

proles used in structural glazing applications.

Dow Corning 3522 Cleaning Solvent

ConcentratedDow Corning 3522 Cleanng solvent Concentated

a cleane degned o the olvent pugng o two-

coponent ete x equpent ued n tuctual

glazing and insulating glass production. This product

doe not contan halogenated olvent and ha een

specically developed to digest cured silicone

ealant peent n equpent hoe and xe.

Dow Corning 1200 OS Primer

Dow Corning 1200 os p -tchc ttt dd th

Dow Corning t ty ct.

Dow Corning Primer CDow Corning p C -t chc

ttt dd td d

tc c t t t dh

dt.

Dow Corning Primer PDow Corning Primer P is a one-part lm forming dd tt

th ct.


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Project Review

Dow Corning Project Support

Dow Corning t t

y th t t th d d

Dow Corning Structural Glazing Sealantsfor your project. All structural glazing projectst d d d yDow Corning

on a project-by-project basis. Only throughct th cd cdd

th Dow Corning stctAdhesion Limited Warranty for your project. For th c t,

t th Dow Corning Project Workow Diagramt th ct.

Product Recommendation

Dow Corning will make a project specic productcdt c th t h

been taken:

Design Review

Dow Corning must review the structural glazingjoint design for every project. A European SGProject Checklist should be completed for eachproject. A joint dimensioning calculator and SGProject Checklist are available at Dow CorningCoins hch c ccd thh

Dow Corning p. p ctct y c

Dow Corning Construction Ofce for moreinformation. A European SG Project Checklist dd th Dctt ct th

.

Dow Corning t dt ch sg

joint dimensioning. If a standard aluminiumprole manufacturer system is used, the system c dd. Dow Corning h

cc t th d dt t c

prole manufacturers.

All non-standard SG joint designs must beprovidedelectronically using .jpeg, .pdf, .doc, .dwg or.t t t [email protected].

D dt y d t th

E-fax number: +32 27 06 50 59.

Dow Corning will review your SG Project

Checklist and SG joint dimensioning within three(3) working days if provided electronically and inth dcd .

Substrate and Material Approval

Dow Corning t tt d

t hch ctct th tct c

t. i tc, t y

ttd thh th yt ct

and project specic testing is not required for

. f ct cdt t th Dow Corning e adh/

Ctty gd hch t

.dc.c.

Adhesion Testing

st dh th t ctc

components of a successful structural glazingproject. Dow Corning t ytt y t ct

cc. Dow Corning tycy

tht tt ch tt

(aluminium prole, enameled glass, coated, tc.) dd t th Dow Corning

st Tt lty dh tt.

a tt tt hd

dcd dtc t tt

used in the actual structural glazing production.it th ty th sg ct t

tht tt t t

Dow Corning tt. u ct

tt, Dow Corning d ttdct cdt, c t d

priming recommendations. Testing takes four (4)weeks from receipt of samples.


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Project Review

Compatibility TestingIncompatible glazing accessories may causet dct d/ t dh

. Dow Corning must approve all glazingccy t y t ct

cc. Dow Corning tycy tht

representative samples of each material (gaskets,spacers, backer materials, setting blocks,

tc.) dd t th Dow Corning stTt lty ctty tt.

it th ty th sg ct t

tht tt t t

Dow Corning tt. u ct

tt, Dow Corning d tt

product recommendation. Testing takes four (4)weeks from receipt of samples.

Non-Stain Testing

Dow Corning tt tt

t dt t t c t

resulting from the migration of uids into thett. Dow Corning tht

tt th tt

(t, , t dt)

dd t th Dow Corning st Tt

lty -t tt. u ct

tt, Dow Corning d tt

product recommendation. Testing takes six (6)weeks from receipt of samples.

Other Laboratory Testing

Dow Corning y d -tdd tt

ch ytc tt H-c tt

dct . i ch c, c

y chd. p t th

project, please contact your local Dow CorningConstruction Ofce for a service fee schedule.

SampleSubmission

f t c tt t,

t t tt thhDow Corning

Cotct indty syt (Coins) hch

c ccd thh Dow Corning p

t. p ctct y cDow Corning

Construction Ofce for more information. AStructural Glazing Project Testing Submission

f th Dctt ct th . Tt hd t t

the following location:

Dow Corning s.a.

pc idt

Z C

b-7180 s

Attention: Sealants Testing Lab

Warranty

Dow Corning offers a project specic StructuralAdhesion Limited Warranty for projects usingth Dow Corning 993 Structural Glazingsc st Dow Corning 895 stct

Glazing Silicone Sealant. Please contact yourDow Corning Construction Ofce for moret th t . T

t ty, th t t

completed:

1. Dow Corning t t t hch ctct th Dow Corning

Structural Glazing Sealant for adhesion andctty

2. Dow Corning t t th

structural glazing joint design

3. a dy ty ct t

ttd d d yDow Corning.

4. Th t t t th ty

thhDow Corning Coins.


10/5210

DC dctt d

ty t d tyt sg act th ty

requirements are satised.


Project Review

Project Workow Diagram

sg act ct tyt DC Coins. Ctd

qC ttd t DC.

sg act ct st

pdct, adh d C

qty Ct pcd

td sg m. rt

dctd qty Ct d

Tcty l

sg act ct sg t

cc thDow Corning

e sg m. rcdd

c t d t

ct cd d

d dct.

Dow Corning tt tt

dh, ctty d -

t. Dow Corning d tt t th sg act

within four (4) weeks with specicc t cd

sg act ct

sg s s DC

Coins. rtt tt

ttd t

Dow Corning dh,

ctty d -t tt

Dow Corning sg d d

d.Dow Corning

tt dd t sg act

th th (3) dy

t ttd DC Coins

SG Applicator completes SG ProjectChecklist via DC COINS to DowC .

SG Applicator identies aluminumsystem name or provides SG jointdt ctcy e- t

Dow Corning.

Dow Corning d dc

t d/ dt sg

act t dct d

ty ct cd t

cc th DC t.


11/5211


Project Review

Structural Glazing Design

Guidelines for the design of structural glazingjoints are provided in this section. The guidelinesdd d Dow Corning t

experience in structural glazing. Not all design d th d.

Dow Corning Tchc sc e

t h th d dsealant user in proper SG joint design.

it th ty th d

and sealant user to conrm that the informationdd t Dow Corning cct d

ct.Dow Corning dt d

make project recommendations only as they relatet th tct c t. oth ct

yd th ct th t ct,

ch c th dty

th , th ty th yt

d d yt ct.

European Technical Approval (ETA)

Dow Corning td t cy th ct

e gd dcd t

e stdd Tchc gd ..

(eTag 002 gd e Tchc

Approval for Structural Sealant Glazing Systems(ssgs) pt 1.) f tt tht td

th d,Dow Corning will make specicproject design recommendations. If the systemsmanufacturer seeks compliance with ETAG 002 th t tdd, Dow Corning c

d cdt th t hch

cy t ty th d

tdd.

European SG Project Checklist Calculator

in COINSa thh Dow Corning p

Website is the project management systemcd Cotct indty syt

(Coins). wth Coins e sg

Project Checklist calculator which can be usedto calculate and submit an SG joint design for

Dow Corning. D ch d, dd, d

ty td t th cct. Th cct

will provide immediate conrmation if thespecic design parameters entered comply with

Dow Corning sg d. Th cct

h dt hth d t eoTa

Guidelines. Once the information is conrmedas OK, the project parameters can be submittedt Dow Corning . a tt

dd y Dow Corning

within three (3) working days. For access toDow Corning p d t

Coins, ctct y cDow Corning

Construction Ofce.


12/5212


Project Review

Structural Glazing Joint Dimensioning

A structural glazing joint must be properlydd th t t ct tdd.

If a joint is improperly designed, the sealantt y c tty c

failure. Therefore, all SG joint dimensioningt d yDow Corning.

Structural Glazing Joint Dimensioning

Guidelines

f d tht y

Structural Glazing projects. Dow Corning treview and approve all SG joint dimensioning.ay ct t th d c y

d y y Dow Corning Tchc sc

e.

The minimum structural joint bite shall be asdtd y th stct bt Cct wdd d g D.

The minimum structural joint thickness shallbe as determined by the Glueline ThicknessCct Th Dtt.

The minimum structural bite shall be asdtd y th stct bt Cct

Ddd.

The structural bite must be a minimum of 6 d th cct.

The glueline thickness must be a minimum of6 d th cct.

The structural bite must be equal to or greaterthan the glueline thickness.

The bite-to-thickness ratio should be between1:1 and 3:1.

The SG joint must be able to be lled usingtdd t ct cd.

The SG joint design must allow the sealant t tht t c c d ch

hyc t.

The above guidelines are minimumt d cd y ct

tc.

Structural Glazing Terminology

Structural Bite

stct bt th dth ctct

c th c t th th

d th . Th d dd,

d, ct d, dd d d

th dtt t t cdd

th dtt th tct t

d

Thickness

Thickness is the distance from the panel to theframe. Proper thickness facilitates the installation th t d dcd t t

dt th t t th

glass panel and frame. Thickness in a structuralsilicone joint is often referred to as gluelinethickness.


13/5213


Project Review

GLASS

SILICONE

GASKET

SILICONE

SETTING

BLOCK

CLOSED CELL

POLYETYLENE

BACKER MATERIAL

STEPPED

INSULATING GLASS

UNIT

SPACER WITH

DESSICANT

STRUCTURAL

SILICONE

SEALANT

SILICONE

WEATHERSEALSEALANT

DOUBLE-SIDED

ADHESIVE FOAM

TAPE

POLYISOBUTYLENE

PRIMARY SEAL

SILICONE

SECONDARY

SEAL

GLASSTHICKNESS

STRUCTURAL

BITECONVENTIONAL

INSULATING

GLASS UNIT

ALUMINIUM

PROFILE

Typical Structural Glazing Detail


14/5214


Project Review

Windload and Glass Dimension

Th tct t t dcty

t t th dd th d d

th d th . Th hh th dd

d th th d th , th

t th t tct t d.

Th ct hch ct th

tct t t th

ht d d th d

windload that the structural glazing system must dd t ccdt.

m stct bt () = g sht s D. () wdd (p) 0.5

140,000 p

Glass Short Span Dimension (SSD) is the shorter of the two dimensions of the rectangular glass. f , 1.5 y 2.5 , th ssD 1.5 .

Windload is the maximum wind pressure in Pascal for a return period of 10 years based oneuroCoDes d c t. Th dd y th d t D

C. 1 p = 1 n/2

140,000 Pa (0.14 MPa) is the Maximum Allowable Design Stress for both Dow Corning 993dDow Corning 895.

Maximum allowable design stress is based on the Ru,5 value with a safety factor of 6. The Ru,5value is the probability at 75% that 95% of the population will have a breaking strength aboveth .

Thermal Dilatation

Th dt th t t th

d th tct

sealant joint a shear stress that must be consideredduring the design of the SG joint. The amount ofdt t dd th

d t ( t t), -

tt ch d d th sg

yt. Th t t th

d t th t.

Minimum Glueline Thickness (m) = Thermal Dilatation (m) x E Young (Pa)3 m ad st sh

Thermal Dilatation is the amplitude of differential thermal movement between the glass and.

E Young is Young modulus as determined byDow Corning.Dow Corning 993 h Y d 1.4 mp dDow Corning 895 h Y d 0.9 mp.

The Maximum Allowed Stress in Shear is determined by Ru,5 value as determined in shear.fDow Corning 993 th 105,000 p. fDow Cornin 895 th

140,000p.

Structural Bite Calculation for Windload and Glass Dimension

Glueline Thickness Calculation for Thermal Dilatation


15/5215


Project Review

Deadload

i td sg d, th ddd ht

th td y th tct c

joint. This situation commonly occurs whenstructural glazing is used on monolithic glass.

Dow CorningStructural Glazing Silicone Sealantsc t th ht th dd

t d t cd th d d t

ddd.

Provided the horizontal frame members are asd th tc ,Dow Corning

consider both the vertical and horizontal or longd th th ddd cct. i

the horizontal frame members will not support the d dd, y cd th tc

th cct.

Min. Bite (m) = 2,500 kg/m3 9.81 /2 x Glass Thickness (m) x Glass Dim (m2)[2 x Height (m) + 2 x Width (m)] x Allowable Design Stress for DL

2,500 kg/ m3 is the specic mass of oat glass corresponding to approximately 25,000 N/m3of specic weight.

9.81 m/s2 ct ty The Allowable Design Stress for Deadload (DL) forDow Corning 993 11,000 p. Th

a D st Ddd Dow Corning 895 7,000 p.

If calculation should be compliant with ETAG002 or if the horizontal frame members will notbe supporting the glass or will deect under the deadload of the glass, just consider 2 x Height (m)

th dt th cct.

Structural Bite Calculation for Deadload


16/5216


Project Review

Structural Glazing System Types

Th y dt ty tct

glazing systems available. Common to all of theseyt tht tct c t d

t tcty ttch th t t

th d tct. s th c

ty yt dcd th ct.

4-Sided Structural Glazing4-sided structural glazing is the most commonand usually most cost efcient type of structuralglazing system used in European countries.g td d th

th tct c. 4-dd sg yt

tycy ctd dct cty d

erected at a jobsite.

2-Sided Structural Glazing

2-sided structural glazing systems use structuralc t th d th . Th

th t d th th chcytd t tcty td y

. 2-sdd sg yt ctd

production facility or at the jobsite.

Slope Glazing

Slope glazing is when structural glazing isd d tht t tc. Tyc

slope glazed SG systems are skylights. In suchc, th ht th cdd

the SG joint dimensioning calculations. Forslope glazing applications, European regulations th td ty . itd

slope glazing has also been used successfully onnumerous projects.

Stepped Glass

Many SG systems install the SG joint on thet c th td . i th

yt, th t t dcd

in a step fashion which allows glazing to thetd . m tdt sg yt

install the structural joint to the internal surface th d th t t.

Please refer to Typical Structural GlazingDt 13 tyc

td sg yt.

U-Prole Channel Systems

Th y ty yt tht

t t t ttchd chcy

to the structure by a U-prole in the cavityt th t . Dd

th t th yt, th c t y

or may not be performing as a structural glazingt th d. Th yt t

d yDow Corning Tchc sc

Engineers on a system specic basis.

Total Vision Systems

Tt yt, hch cy d

at the front of a building to maximize vision area,use a glass n to structurally support the vision. i ch c, th 2-dd sg yt y

th tct c h th edge to the glass n. Dow Corning t hd t tcty dd thy

ddt t d.


17/5217


Project Review

Other System Types

Structural Glass Systems

stct g syt, t cd sd

syt btd syt, h d

many high prole buildings. Holes are typicallydd ch c ch d th

ttchd chcy th t

t d. Th yt t tctglazing although they have a similar appearance th t. i ct d, th d

y ttch t th t t

t. i ch d, th t

t h tct ct. i

ty stct g syt, c

t y tt t

ttht th d th c

th t t.

Structural Attachment of Non-Glass

Materials

stct c t c d t ttch

t th th . Dow Corning t

tt d th t t

specic basis. Examples of such materials include

ct t, t depoxy-backed thin stone panels.

Protective Glazing

stct c t cy d

d yt hch dd t tt

th ct t t. i

cases, these systems are also structurally glazed.The use of structural glazing in bomb blasttct d d t d h

been done successfully on numerous projects.i th d, th t y tof a complex glazing system which includes the, d t. Th tct c

t y tt y ch th

t th d t

ct. D t th hyc d

chc t c (.. ctc

t, t dh d dty)

hch c t d t d, hh

c tct c t th

t chc th ct. f

assistance in protective glazing designs, pleasectct y Dow Corning Tchc sc

e.


18/5218


Project Review

Substrates and Materials for Structural

Glazing Applications

it tt th d sg yt

tht th t d. athh

Dow Corning tt d

materials on a project by project basis, certain cdt c dd d

the design phase of the project.

Dow Corning Europe

Adhesion/Compatibility Guide

a t .dc.c th

Dow Corning e adh/Ctty

Guide. This guide summarizes cleaning and cdt Dow Corning

st ty c ctct

t. Th c t

recommendations for specic aluminium prole

ct d ctd, d d ttd dct. a cdd d

specic compatibility recommendations onlaminated glass products, gaskets, tapes and othert. Th d dcy dtd

th t d cdt.

Aluminium Proles

Dow Corning works closely with most of themajor aluminium prole manufacturers in Europe

t y th yt. Dow Corning h t dt dh tt t th

proles from these manufacturers. Aluminiumproles, whether anodized or painted with ayt d ct (ppC), t

chtct d ty (qualanoD

qualiCoaT).

Stainless Steel

st st h d ccy

structural glazing substrate. The stainless steelt chtct d ty d

hd ttd tDow Corning dh

d ctty tt.

Laminated Glass

Some laminated glass which utilizes polyvinylty (pvb) y dt t 6 h

ctct th t c c t.

Th h y thtc cc d

d t ct th c td

in structural glazing applications. For specicctty t d cdt,

t thDow Corninge adh/Ctty gd hch t

.dc.c ctct y td

..

Coated, Spandrel and Tinted Glass

Th y ty ctd, d

d ttd t t th

yt d. Th y tt

cdt th ct . f

specic recommendations, please refer to theDow Corning e adh/Ctty

gd ctct y Dow Corning Tchc

sc e. f th

general recommendations:

Soft coating must be completely removed c t c tct

c t. Th ct d t d

dt tth d dty t

tty th tct d. st ct

are often very difcult for silicone sealant todh t. rd t ct th

c y c t dh

ty t ( c).

Hard coatings are acceptable surfaces forstructural glazing if these products havedttd t tty d t

adhesion has been veried through testing byDow Corning.


19/5219


Project Review

Ceramic enameled spandrel coatingswhich are baked onto the glass during glassdct d hch t d c

ty ct cct c

structural glazing. Some patterned glasses aredifcult to adhere to and must be submitted ty tt y Dow Corning

t .

Tinted glass, like clear oat glass, tempered d ht tthd , cct

for structural glazing. Sandblasted or acid-etched glass may be difcult to adhere to andt ttd tDow Corning tt

t .

Self-Cleaning and Easy-to-Clean Glass

Th ty d

tc t th d

d h ty ct y. fct cdt th ty,

please ask the glass manufacturer and refer to theDow Corning e adh/Ctty

gd ctct y Dow Corning Tchc

sc e.

Gaskets and Rubber Materials

Th y ty t tht

d d d

may not be appropriate for structural glazingct. a ct t

y td th c

plasticizers that may leach into the structuralc d c dct, t d

tty t dh t tt.

Dow Corning cd tt d

of materials on a project by project basis. SomeSG Systems have qualied and pre-tested theirspecic rubber materials. Historically, certain

t ty h t t structural glazing. Following are some generalguidelines for gaskets and rubber materials:

A structural spacer material in direct contactth th tct c t y

ct. mt ch c

t, yth ythy

t ct hh ty

y d pvC t h ttd d

d t cct th ct.

100% silicone polymer extrusions and gasketsd th t ctty th

c t.

Gaskets and setting blocks made of neoprene epDm tycy dc ht cd

c th t. Th

t hd t d ctct

th th tct c t y h

cdt ctct tht h ct

on the performance of the sealant. Projectspecic compatibility testing will determine

th tty th t thct.

Highly plasticized gaskets and extrusionshch c t dh t

d y ctct thDow Corning

stct sc st.


20/5220


Product Quality

Dow Corning t ty

c tt ct ct

ccdc th iso 9001 tdd. Th ct

th tdd t d th t

th cd d cdt

th t, hd, d ty

ct Dow Corning Structural Glazingsc st. a t , y t d,

dtd d cy th cd

d cdt t th th ct

th . i y h t d

y th cd

cdt, ctct y c

Dow Corning Construction Ofce or yourDow Corning Tchc sc e

t th Dow Corning st.

General considerations

Material storage and handling

Dow Corning st t td t th

cdd tt d t.

ec tt t y c

t t dd. st c, dh d

hyc t cd hd th t

t hdd d td y. Th t

t dtd d cdt

th d t

t-ct c t.

Shelf life

Dow Corning st t d th th

ttd h . st tht d yd t

ttd h y t c y t t

hyc t d t t d.

Factory vs. Site Glazing

Structural Glazing fabrication may occur ina production facility or at the job site. Two-

ct tct c t tycy d th ctd t

dct cty.

o-ct tct c t y

d dct cty t

or at the job site. All parties involved with aproject, including the architect, engineer andcontrol bodies must support site glazing for aspecic project. Specic local requirements maynot permit site glazing in some instances. Curerequirements and considerations for site glazing dcd t th ct.

Joint Preparation and Sealant Application

Specic procedures and recommendations onjoint preparation and sealant application ared t th ct. Th cd d

cdt h t

sealant adhesion, cure and joint ll. Ignoringor skipping a step in the process could have and ct th c th tct

c. Th cd hd dtd

d cty d y th t .

Quality Control

a ch qty Ct th

t ctc t cc tct

glazing project.Dow Corningd cdd cdt tht t cty

dtd d d y th t .

Th cd t ct d

. i th Dctt ct th

, Dow Corning d ty ct hch c d y th t .

Dow Corning t y th dt

ch ty ct .

Dow Corning dt dct cty

and make recommendations for improvement ifcy. lt th ct t ctc

d sg dct ct.


21/5221


Product Quality

One-Component Sealants

Storage Temperature and Conditions

Dow Corning 895 Structural Glazing Siliconest t td t tt

+30C. An expiry date is clearly marked on theproduct packaging. Sealant should only be used ifit is within the expiry date shown on the package.

The sealant should be kept in its original unopenedpackage until the sealant is to be used. Sealanthd td d dy t.

Skin-over time/elastomeric test

A skin-over time and elastomeric test should bed c dy d ch t

t t d. Th th tt t

tht th t c y d h tyc

tc t. ay t ch

excessively long skin-over time may indicate thatth t t h h tdat excessively high temperature. Skin-over time y th tt d hdty. Hh

tt d hh hdty c th

sealant to skin-over and cure faster.

Th cd t d

y t d dct.

pdct ty ct cd, ch

dh tt dct t,

dcd t th ct.

1. Spread a 2 mm thick layer of sealant on aythy ht.

2. Every few minutes, touch the sealant lmlightly with your nger.

3. wh th t dh t y

nger, the skin-over time has been reached.If the skin-over time is greater than 2 hours,d t th t d ctct y

Dow Corning Construction Ofce.

4. a th t t c 48 h.

at 48 h, th t th

ythy ht. sttch th t y

t dt hth t h cd t

tc t. a ct

d t c d c. i

th t h t cd y, d t

th t d ctct y Dow Corning

Construction Ofce.

5. rcd t y qty Ct .

a qty Ct

th Dctt ct th .

Th ctd hd td d y Dow Corning

t.


22/5222


Project Quality

Two-Component Sealants

Storage Temperature and Conditions

Dow Corning 993 Structural Glazing Siliconest t td t tt

+30C. An expiry date is clearly marked on theproduct packaging for the curing agent and base.st hd y d t th th

expiry date shown on the package. The sealantshould be kept in its original unopened packagest th t t d. st hd

td d dy t. Ct

c t d t t-tchd.

f ctc t t t th dt

container of material rst.

Two-Component Dispensing Equipment

Guidelines

Dow Corning 993 Structural Glazing Siliconest hh c t, hch

certicated and approved by ofcial authorities andtest institutes for structural glazing applications.py d, th t d ct

-t dh d dty, hch

necessary for structural glazing applications.

Dow Corning 993 Structural Glazing Siliconest cct d

y th t t ch t tdd

c. stt th t tchy th

ct t-ct t

htctd , t d

ch th th dyc ttc .

Th dt ch

t. Th d ch

the market are all different in design, so thereforeDow Corning ty cd tht th

t th d dd y

th t d th

d tc th d t.i ddt t th d th t

, Dow Corning cd tht th

t dtd d c th th

following best practices:

Provide Proper Sealant Storage Conditions

st ct t td th

t cdd t tt

+30C. Sealant can be used at temperatures ofup to +40C. If a sealant container is kept in a

dct cty t tt tthan +30C for one week, replace the material.Ct hd td th

d ct.

Maintain Proper Production Facility

Temperature

at tt th dct cty

must be between +10C and +40C. For bestc, t tt t

+18C to +30C. At colder temperatures,between +10C and +18C, cure rate anddh dt . i hh

temperatures, between +30C and +40C,working time will be shorter.

Avoid Excessively High Humidity

i hh t hdty, th t

cure faster and have a shorter working time.ecy hh hdty (>80%) cd c

t th tt c d dy

affect sealant adhesion. To minimize the damage t th dd t ct,

pails and drums must be kept airtight duringt d t cd th d

t. wh t, th

inside the drum or pail must be ltered and dried(silica gel lters are recommended).


23/5223


Product Quality

Curing Agent Must Be Homogeneous

p t c t th d

t, th c t hd y

ctd d ttd th t

hty. D t ct c

d th c t. l d

d cty c t (stdd & Hv)

are more likely to show separation and should be

d t . Hh cty c t(Hv/ger) d t y

but it should be checked in all cases before use.it cdd t th c t t

th dy th d t chd t

th c t t d-.

Properly Maintain Sealant Dispensing

Equipment

it t tht th t th

ty tht tht th td t ct y.

bc th y dt ct

d t, tc

t d. rt c

to all equipment manufacturers include:

Sealant must be dispensed free from exposuret . Dow Corning 993 Structural Glazingsc st t cd

cd yt t . a

ctd t th t y h

dtt ct th dh

d c th t. a td

d th ch t ct t

be completely bled out or ushed out of theyt t .

Regularly inspect and maintain components th d t. a c

ctd t th t th

is defective or gaskets have hardened or dd t th

yt. wh hh

t th t yt,

regularly check the follower plate to ensuretht t thy d t

blocked by a damaged drum or pail or by adamaged or brittle gasket. Proper maintenanced c th h t

properly mixed sealant. Filters and gasketshd y ctd d cd

cy.

Ensure that there is no contamination oft ct. st t t c

ctct th chy th

equipment. Pumps must be checked fortht d hd t d th

t.

wh t ch

Dow Corning 3522 C st

Ccttd c th

, th t t ctycd t th t t d

ctt th t th t. a

gaskets must be compatible with the cleaningt.

Regularly maintain gaskets. Some gaskets,cy th dct ctct t th t

ct, cd c tt h

c t d .

Deteriorated gaskets must be immediatelycd. p t y t

supplier gaskets and other components, which ct d cdd

th Dow Corning 993 Structural Glazingsc st. Th t

hd d chd

replacement of gaskets. Please contact yourDow Corning Tchc sc e

you need specic recommendations.


24/5224


Product Quality

Surface Preparation and Sealant

Application

Every structural glazing project requires adt d thh cd t tht

tt y cd t t

ct. Th cd hd

followed for every structural glazing application.

fth dct th c, dc cd cdd th t

ct.

1. Inspect tt d t t

. Th t d dct t

tt th t tht

ttd d d y Dow Corning. Th

substrates, i.e. aluminium proles, should d cdt d t dd y

td th.

2. Clean tt cdd th

Dow Corning written approval for the project.Jt c t y c, dy, dt

d t . mt ctt

th c y h d ct

t dh t tt.

3. Prime th c t c t d

y thDow Corning tt th

project.

4. Place the glass or panel to be glazed. Caremust be taken to not contaminate cleanedc d y h dct.

i ctt cc, c t

cd.

5. Apply sealant into the SG joint cavity. Thejoint must be completely lled with sealant.by h th d t t th

joint in a continuous manner, air entrapmentc dd.

6. Tool or strike the sealant joint surface with at dc ch t. Th t

must be pushed into the joint with a tool.

Scooping excess sealant from the joint is notcct t. T h t

that the sealant wets out the joint surfacesand completely lls the joint without airtt.

7. Inspect the nished SG units. Determinewhether the entire SG joints have been properlylled and tooled. Determine wether the SGt td th cdt d

ct hth th t c y.e tht th cdd ty

ct tt d.


25/5225


Product Quality

Substrate Cleaning Procedure

The key to acceptable sealant adhesion is a cleanc. f cd t c

- d tt.

Non-Porous Substrates

n- tt ch d

t cd th t t

ct t.Dow Corning cdth t-cth c thd d t c

- t. Th t-cth c

thd dcd t th ct.

Dow Corning r-40 C cdd

t c - tt.

att t cdd. i t

th th Dow Corning r-40 C t

d, dty th ctd t d

completion of the SG Project Testing Form.Dow Corning will test with your specic solventd. p t, d dtt t

cct c t.

Porous Substrates

p tt ch t, ,

t cct d d

cdd . Th tt

d t cy th

non-structural applications. For speciccdt tt,

t th Dow Corning bd eWeatherproong Manual which is available at.dc.c.

Solvent Consideration

Th t d th ct

cdd d c th

these products. You should always check withth th tt t tht th

c cd d t ct

th ch tt.

Masking

If aesthetics are important, surface adjacent tothe SG joint can be protected by masking. Priorto sealant installation, a masking tape can beapplied to the surface adjacent to the joint. Testth t t t tht t c y

d d d t d th tt.

D ct th t, d t y th

tape to joint surfaces since residual adhesive fromt y h t dh. idty

t th t h d d td,

th t.

Two-cloth cleaning method

Th t-cth c thd

tch t c - c. Th

cth t c tt t

cdd cd d t ct

t cth. C, t, t, t-

cth t d. Th thd ct c th tt th t ttd

cth d y dy th t

c cth. f th cd dcd

in greater detail:

1. Thhy c c

d.

2. p tty c t t

a working container. A clear plastic, solvent-resistant, squeeze bottle works best for this. D t y t dcty

th ct.

3. Wipe the joint surfaces with sufcient forcet dt d ctt.

4. idty dy th t t

c th tt th t c,

dy cth. Th cd cth t thtt th t h td.


26/5226


Product Quality

5. vy ct th cd cth t dt

ctt cty d.

i th cd cth dty, t th

t-cth c thd t th cd

cth c. f ch t

c, tt ch cth t c t

th cth. D t c th th dty

t th cth. f t t, c

d d dty cth ty.

Substrate Priming Procedure

Dow Corning 1200 os p cy

the primer recommended for structural glazingct. Th cd dc

h t y c th

Dow Corning 1200 OS Primer:

1. b , y tht thDow Corning 1200

os p th t ttd h . Th

primer should be stored below 25C in its d ct. Th

should be clear and water-like in appearance.If the primer is milky white in appearance, dot th . rd cd

.

2. Joint surface must rst be clean and dry. Thet hd th

(4) h t th c t. i th

a greater time delay, joint surfaces must becd t .

3. p t t c,

dy ct. D t th 10

minute supply of primer into the workingct. rc d tht th c

th ct dty t d

th . ec th

t thc t c

it to deteriorate and turn milky white in thect.

4. p t th

working container onto a clean, dry, lint-freecloth and gently wipe a thin lm on all jointc . ay y h

t t th c. o c

c dh t th t d

th tt. i t ch d,

powdery white lm will form on the substrate.o t cct ctc d

hd td dty. od

c t cd d d

.

5. a th t dy t th t

evaporates. This typically takes from 5 to30 t dd tt d

hdty.

6. ict th c dy d th

c . a d -porous surface will have a slight haze. If redcd d, th d c

d c. pd c t

d th th t (4) h. ay

c d d t d th

h t cd d d

y t.


27/5227


Product Quality

Placing the Panel

The glass or panel can be placed once the prolesh cd d d cy.

Th c d cd hd

d t th t t th

or panel. Care must be taken to not contaminatecd d d c tht t

d. f t c c dh .

Dow Corning cd th d- t t hd th

is concern about physical contact with the jointc.

Site Glazing Considerations

mt th tt c d

cd dcd y t th t

glazing and factory glazing. Key considerationsfor structural glazing on site include:

Sealant must be stored away from excessiveht. e th t t hh

tt d c th t t

dd d c y.

An application temperature range of+10C to +40C is recommended. At lowertemperatures, the substrate must be kept cdt t. stt

temperatures in excess of +50C willdy ct th c d dh th

t t th tt.

Because environmental conditions cannot becontrolled on a jobsite, joint surfaces must becd d d d th t

cd d d (1) h .

Temporary fasteners must be used to keepthe SG joint stable during cure of the sealant.

Dow Corning 895 requires 1 to 4 weeks c. st c t

is inuenced by the SG joint geometry,tt d hdty. Ty

t y y d c th

t h dd c d dh

A comprehensive quality control programwhich includes the skin-over time, elastomerictt, dh tt, H-c tt d

deglaze test must be followed. Dow Corning c t th dt

ch ty ct

for structural glazing on site.


28/5228


Product Quality

Sealant Application and Quality Control

Procedures

Sealant Application Procedure

Sealant should only be applied in SG jointshch h cd d d y th

cdd cd. st t

d t c, dy, dt- d t-

surfaces and the joint surfaces must be primed ifcdd y Dow Corning for the specicproject. Sealant adhesion may be harmed by animproperly cleaned or primed SG joint. Sealantmust also completely ll the SG joint. Thec th sg yt ddt

having appropriate structural bite. An underlledSG joint may jeopardize the performance of thesg yt.

Th cd dc th procedures to apply sealant:

1. ay t ct t

ct d t.

A positive pressure, adequate to ll the entirejoint, should be used. By pushing the beadof sealant into the joint in a continuous, tt c dd.

2. T th t th ht

skin forms on the sealant. This is typicallyth 5 t 10 t.

3. ad th t t d ch

t d t. Dy t

cdd. D t c t c

th d t cty h t t th

joint causing the sealant to fully wet out thesides of the joint.

4. If the surface adjacent to the SG joint has beenmasked, remove the masking at this time.

Sealant Cure Requirements

a c t hth -ct

t-ct t thc

t t c. i cd ct ccd

joint that is not exposed to atmospheric moisture,t c t tt. st

dh y cc th t d

t c t t hyc t. p

that the tooled sealant joint is fully exposed to thet.

Site Glazing Cure Requirements

Temporary support of adjoining materials must d d th c tct t

site glazing. The SG joint must be static duringc t t t th t t c

d d dh d tth.

Dow Corning 895 Structural Glazing Silicone

Sealant typically requires 1 to 4 weeks or longerto fully cure depending on the joint geometry,tt d t hdty.

Factory Glazing Cure Requirements

Dow Corning 895 Structural Glazing SiliconeSealant typically requires 1 to 4 weeks or longert c dct cty t. C

rate depends on joint geometry, temperature andhumidity. The structurally glazed units must notbe moved to the jobsite until the sealant has fullycd d t c dttd thh ty

ct tt tht th t h chd

dh (100% ch ).

Dow Corning 993 Structural Glazing Siliconest c d ct th 3 t 4

h dd tt d hdty.

Th t y ch dh

(100% ch ) 1 t 3 dy. Th

structurally glazed units must not be moved

to the jobsite until the sealant has fully curedd t c dttd thh ty

ct tt tht th t h chd


29/5229


Product Quality

adhesion (100% cohesive failure). Verication oft c d dh d thh th

dh d/ H-c tt. it

th ty th sg ct t

th tt cd th . Th

cd dcd t dt t

th t ct.

Reglazing Procedures

Glass breakage occurs during all phases of aconstruction project and even long after the buildingis completed. How a system will be reglazed isan important design consideration. The specicprocedures will vary from project to project.Following are general guidelines for reglazing.

Reglazing Due to Glass Breakage

Th cd tht

Dow Corning Silicone Structural Glazing Sealant

was originally used on the project and that the cdt t th

ctct th . i th t

t , ctct yDow Corning

Construction Ofce.

1. ft dt tht th t t

dhd. a dh tt t

performed to conrm that the existing sealanth ct dh (100% ch )

t th . i ct dh tchd, ctct y Dow Corning

Construction Ofce.

2. r t dd . Dd

th d, th y d

ctt d .

3. Cut away the silicone leaving a thin lm(1 t 2 ) t th . Ct

th t t cy. ict th t d,

care must be taken to avoid damage to the nish th tt d th t.

4. i hy d t d th

1 h t ctt th cd t, t

c th t c c

t cy. sc c t

y dh t cd c t,

d c t t

dh t c t. i th t

c t cd, th d

t t t ct th

t.

5. i th t t cty d

d t th , t c th

d. p y

d. p t th

Dow Corning approvals for the project.

6. C d th

tt th . rc th c

cy d t th . it tyt t th t

attached as the sealant cures. Mask the joint cy.

7. Fill the SG joint with a fresh bead of sealant.Tool the joint and remove the masking ifd. p t th t ct

cd dcd th ct.

Inspect the joints to ensure that they are

completely lled and properly tooled.

8. at th t h y cd, th ty

c y d. o-ct

sealant cure may take 1 to 4 weeks or longerdepending on the joint geometry, temperatured hdty.

9. qty ct d dcd t

th t cty d.


30/5230


Product Quality

Some SG systems do not allow easy reglazing ofth dd . Th yt dd

t h th t ct t, cd

th , d d cd tth. i

ch tc, th t ct

guidelines for new factory glazing which isdcd th ct.

In some instances, the structural joint cannot ccd c th h t. wth

yt ch th h th ct

removed and the glass must be set in the eld,it is acceptable to use the following reglazingcd. p ct th y

Dow Corning Tchc sc e

to using this reglazing procedure.

1. r th dd d th

tt dcd t 1 thh 7

ct sc pt dst act.

2. ay t dcty t th . eh

sealant must be applied to comfortably overllthe SG joint once the glass is set on the frame.Th t t th 10 t

t ct. Th t c

the sealant so it sufciently lls the jointsth tt . i

possible, the joint surface should be tooled.

Reglazing Due to System Failure

athh ct yt tct

glazed system is very rare, there are situations,particularly with older SG technology or linkedt ty t ctd th th

tct c, h t sg d

must be replaced. Because these projects can y c, ctct y

Dow Corning Tchc sc e d

th tt d h th

dt.


31/5231


Product Quality

Quality Control Test Procedures

General Considerations

qty Ct th t tt

elements of a successful structural glazingproject and is the primary responsibility ofth sg ct. Th ct th

hd y dtd d cty

d y th t . Th cd dcdt d th ct th

dt ch ty ct

. i th Dctt ct th

, Dow Corning d ty ct

hch y c th dt

ch ty ct y th

t .Dow Corning t y th

dt ch ty ct

program specically for your organization.Dow Corning dt dct cty

and make recommendations for improvement ifcy. lt th ct t ctc

d sg dct ct.

Sealant Production Quality Control

D dct, dc ty ct hd d Dow Corning 993 sc

Structural Glazing Sealant produced through thet-ct d t. Th

tt cd h t th t

y d t th cct t. Th tt

d th cdd cy h

the following table:

Sealant Production

QC Test

Frequency of Test

After Each Pump

Start-Up

After Each

Container Change

Diagnostic

Investigation

g Tt rd1 rd1 rd

Buttery Test rd1 rd1 rd

s T Tt rd rd rd

m rt Tt nt rd nt rd rd

athh Dow Corning 993 Silicone GlazingSealant - Black is most commonly used, thet ht, y ct

colors for special projects. In such cases,

performing tests such as the glass test and buttery

test will be more difcult. Please contact yourDow Corning Tchc sc e

specic quality control recommendations fory htDow Corning 993.

1 Either the glass test or buttery test must be performed at the scheduled frequency. It is not required that bothtt d.


32/5232


Product Quality

Glass Test

Th g Tt cd d t t

th Dow Corning 993 sc stct

Glazing Sealant. This test is performed each time tt- d t th th c t

ct chd. Th

th tt t dt hth th t-

ct d t dty

th t d c t.

f tddDow Corning 993 Black, the sealantbase is white and the curing agent is black.When properly mixed, the nished sealant isuniform black, with no grey or white streaks.i c th t dd

check valve, a clogged hose, a clogged mixer,tc. r t tc h t

t . p ct th

y d t ct

tc d. i y, ht ctcd Dow Corning 993 sc stct

Glazing Sealant is being used, please contacty Dow Corning Tchc sc e

cdt.

T th g Tt mthd, y d

t t c, c hch

ty 10 c 10 c. pc th

c, c t th c,

th t c tth. p t th d th . Th t

dchd t hd th y

inspected for grey or white streaks. The sealantshould appear completely uniform and black.i t t, th tt

t ddt t cd thh

th ch. it th t t ,

t tc y d. i

ddt tc d, ctct

yDow Corning Tchc sc e.

Glass Test: Proper Mixing

Glass Test: Insufcient Mixing


33/5233


Product Quality

Buttery Test

The Buttery Test is a procedure that is similart th g Tt. Th tt d t ch

tt- d t th th c t

ct chd. Th th

tt t dt hth th t-ct

d t dty

th t d c t. f tdd

Dow Corning 993 Black, the sealant base is whiteand the curing agent is black. When properlymixed, the nished sealant is uniform black, withno grey or white streaks. Improper mix can bethe result of a damaged check valve, a cloggedh, cd , tc. r t

tc h t t

. p ct th y d

t ct tc

d.

i y, ht ct cdDow Corning 993Silicone Structural Glazing Sealant is being used, ctct y Dow Corning Tchc

sc e cdt.

f th cd

Buttery Test:

1. fd ht t, ht a4 h.

2. ay d t t th d th.

3. p th ht tth c

the sealant into a thin lm.

p th t d y ct th

t dct

Apply Sealant to

Folded Paper

Press Together

Insufcient Mixing

Proper Mixing


34/5234


Product Quality

Snap Time Test

oc th t thd

by the Glass Test and/or Buttery Test, a SnapT Tt t d. Th tt

d ch t tt- d t

th th c t ct

chd. Th t tt h t dt

th t cct d hth th t

c y. md t hd

like a one-component sealant until the chemicalct t th t d c

agent begins to take place. The sealant will in att t t d t

h tc t.

Following is a procedure for the Snap Time Test:

1. f ct th d

Dow Corning 993 Silicone Structural Glazing

st.

2. Place a small stick or spatula into the sealant.rcd th t.

Every few minutes, pull the stick out of thet. D t t tt th t. a

th t c cd, th t

c ty. oc th t t chy

and snaps back once it is pulled, this is the snapt. rcd th t.

Th s T Tt y dd

tt d hdty. Hh tt

d hh hdty c th t t

t. Cd tt d

hdty cdt th t. o

the following page is a gure which shows thect tt t. s t

y tt t tt dd

h th t ttd. a, th

t t t t t d th

t . Hhy t

cd dct th th

. Th t tt dtt t tht th t d c. i th

t d t c, th th tt

d.

Stick Inserted Before Snap Time

in Cup Snap Time


35/5235


Product Quality

Mixing Ratio Test

Th m rt Tt t tt tht d

yDow Corning dy tt. Th tt

t dt hth th t t th

cdd t 10 t 1 y ht. mt

t-ct c d ch

d t hch th

ratio to be checked. Following is a procedure toperform the Mixing Ratio Test:

1. Pressure valves must be adjusted in such away that the pressure is equalized for bothct.

2. Hd d c dth ch

tt th . o th 10

seconds or at least 3 strokes of both the based c t .

3. wh th t c, th ht th

c t. Th ht t t th t-

ct hd t 9 t 1 d 11

t 1.

it h th c Dow Corning tht

th tt t dy ty ct

tt. it tt th cc th

th th t th t. Th tt

thd y d dtc tt d

with the glass test or buttery test and the snaptt, hd th tt

t . Dow Corning Tchc

sc e t t y

th cc th c

Dow Corning 993 Silicone Structural Glazingst.

Typical Snap Time vs. Temperature for Dow Corning 993 Structural Glazing Sealant

Snap Time vs. Temperature for Dow Corning 993 Structural Glazing Sealant


36/5236


Product Quality

Adhesion and Cure Quality Control Tests

Th dh d c ty ct

tt ddy d tth th t

t dt hth y h cc

structural glazing project. Each test is valuable t y d t cdd t

y ch ty ct .

Dy p dh tt cdd th

daily test to verify sealant adhesion. For anodized tt, th t dh

t dcd t 15 t t

. H-c tt cdd

tt t y cd t t.

Deglazing is a procedure to verify proper sealantdh, c d ty ct dct

t.

Dow Corning th dh d c

ty ct tt d y th t

t th cy cdd th

following chart:

Sealant Adhesion

and Cure QC Test

Frequency of Test

After Each Pump

Start-Up

After Each

Container Change

After Each Substrate

Change

p adh Tt

Dyrd rd rd

p adh Tt

wt

rd (y

anodized aluminium)rd (y

anodized aluminium)rd (y

anodized aluminium)

H-pc Ttatt t p

adh Ttrd1

att t p

adh Tt

H-pc Tt wt

att t p

adh Tt wt

(only for anodized)

rd1 (y

anodized aluminium)

att t p

adh Tt wt

(only for anodized)

Deglaze Testnt gy

rd2nt gy

rd2nt gy

rd2

1 H-pc tt t ch ct ch y t d yDow Corning c.2 Deglaze testing is a valuable test that should be included in every comprehensive quality control program.Deglaze testing may be required for specic projects or if special warranties are requested.


37/5237


Product Quality

SEALANT

BONDBREAKER

TAPE

GLASS OR

ALUMINIUM

SUBSTRATE

SEALANT

BONDBREAKER

TAPE

GLASS OR

ALUMINIUM

SUBSTRATE

Peel Adhesion Test: Cohesive Failure Peel Adhesion Test: Adhesive Failure

Peel Adhesion Testsp dh tt th t ct dy tt

t y t dh t tt. Th

c tt hd d th dy

tt t y dh t t tt.

Th tt hd d tt t

hch th t ctd t h dh t

the following intervals:

After each pump start-up or after extendedbreaks

After a change of the curing agent or basect

For each new lot of substrate

f dct th dh

test:

1. C d th tt cdd

yDow Corning.

2. pc c ythy ht d

breaker tape across the at surface.

3. ay d t d t t t

t ty 20 c , 1.5 c d

and 6 mm thick. At least 4 cm of the sealanthd d th ythy ht

or bond breaker tape.

4. it et to ed a we eh halway wthn

the ody o the ealant. fo et eult, olventclean and pe the ceen to enue good

adheon to the we eh. i we eh not

avalale, elale eult can tll e acheved.

5. at t c, th 4 c t t

hch y th ythy ht. p

the sealant at a 180 angle. Peel back only 1t 2 c t th d

c ddt tt.

6. i th t t th t d

y dd t th tt, th cd

ch . 100% ch

d c th dct tht th tth dh t th th tth

ch.

7. i th t th tt, th

dct 100% dh (

0% ch ).sc t dh

d t, t th tt t

ddt 24 h c. Ct t

100% ch chd. i dh

d t d ctd, ctct y

cDow Corning Construction Ofce

For anodized aluminium and when 100%ch cdd dy cdt,

c th t tt d t

for 15 minutes at room temperature. Take outth t th t d tt

tt cd. 100% ch

t cdt d. i dh d t

d ctd, ctct y c D

Corning Construction Ofce.


38/5238


Product Quality

f ddt cdt

for peel adhesion testing:

Peel adhesion tests must be run on production th ct t tt

or prole.

The substrate should be cleaned exactly they th dct t cd.

The peel adhesion samples must be cured inth tt d hdty tht th

dct t td.

Samples should be tested periodically, 1, 2, 3 dy c

Dow Corning 993. Tt c ccd c

th dh tt h dh

100% ch . fDow Corning 895,

dh tt hd d t 7dy t.

For the wet adhesion test required for theadhesion on anodized aluminium substrate,no specic reconditioning required before the tt.

Local authorities may required specic andadditional testing procedure such as: Once

ch dh, dth tt t dy

t dy d tt th ch

.

Important: SG production units can only be

shipped to the jobsite once full adhesion has

been veried by successful peel adhesion tests

under dry and wet conditions (for anodized

aluminium). 100% cohesive failure required.


39/5239


Product Quality

H-piece Test

Th H-c tt th y tt d t

t t c t. Th tt hd

d c y ct

d c t. i ct chd,

H-piece test should be used to conrm that thet c t cct. i

tc, Dow Corning y t H-

c tt t ch tyct th cd ch

adhesion and deglaze testing are performed at t cy d c tdd

d t d t H-c tt.

Th H-c tt c d dy dh

ty ct tt t c th tt

cctd t , th tt th

cdd dy dh ty ct

tt.

ey t ct chd, H-c

tt hd dcd. s hd

d ct dct tt

(aluminium prole and glass, typically). Thett hd cd d d th

dct t d.

Th tt hd td th

tt d hdty t th

ct dct t.

The rst H-piece sample should be tested when

production units are to be shipped to the jobsite.Th dh tt hd d t y

dh (100% ch ). f

dh tycy cc t 1 t 3 dy

c Dow Corning 993 and 1 to 4 weeks forDow Corning 895, depending on joint geometry,tt d hdty. Dow Corning 895

t h dh d c th ct

dct t th t hd t

the jobsite. If properly cured, the sealant should

h tth 0.70 mp th 100%ch . i t t cct,

cd H-c ddt

tt.

wh dy t cct h

H-c tt d tt t p tt

for anodized aluminium, wet testing must also td t 15 t t t

tt. f dh (100% ch

) d tth 0.70 mp t

chd dy d t cdt.

b dt h th d

H-piece sample:

Tt c d d

block which has been cut to allow a cavity tobe lled with sealant in the dimension shown.The wooden block should be pre-treated with asoap solution or parafn wax to provide a bond-broken surface for the sealant. Alternatively, a

polyethylene bondbreaker tape can be appliedt th d c t ctct th t.A polyethylene U-channel specically designed th tt thd c d. T

H-c hd dcd y

12mm

50 mm

50mm

12 mm

Glass

Silicone

Glassor

Metal


40/5240


Product Quality

ct c t d d

dct. Tt hd td th

cdt th ct dct t.

o hd ttd t th t tht

production units are to be shipped to the jobsite.sty, dh tt hd y

dh (100% ch ) t th

t.

H-c c ttd th th

tt thh th r

sc. a r sc td

th c t tt t c d

dh th ct c t.

The weight applied to the silicone joint is equalt th ht (w) th r sc t

t th t /. Th H-c

hd ttd t t. Th t tth

t t hd 0.70 mp.

Th cd t tth 12 *

50 * 0.7 = 420 n d t th tt c.

This strength corresponds to a load of 42 kg. If ther sc dd t h / t 10,

weight of 4.2 kg should be applied to the plate (W).

Th d hd d

10 cd th dh

ch th H-c. i

rupture occurs, incrementally add 0.5 kg to thec t th H-c t. rcd th d

t t d ct ch d

th tt .

i c c tdd, H-c tt

th Dow Corning 895 Dow Corning 993

hd t tth 0.70 mp

th 100% ch t ct dct

substrates. For anodized aluminium, samect t chd t th 15 t

t t tt. rt

H-c tt hd cdd ty

ct . a cy sg qty

Ct l cdd th Dctt

ct th .

R

W

R = W * b/a

a b

Roman Scale


41/5241


Product Quality

Deglaze Test

Deglazing is a method of quality inspection usedto conrm sealant adhesion, joint ll and qualityin actual SG production units. Deglazing includescomplete detachment of a structurally glazed . oc th

d, th c t ctd

cure, mix, uniformity of ll, lack of bubbles or tt d t tty, t y

sealant adhesion. Deglazing is very useful toproduction personnel as a form of feedback onth c. pdct hd

t d th ct.

icdd th Dctt ct th

manual is a deglaze inspection form. Duringct, th t hd

evaluated:

Measured dimension of the structural bite.Th tct t dtd

in the project review must be satised. Anunderlled joint may affect the performance th sg yt.

Measured dimension of the gluelinethickness.

Adhesion of the structural sealant to the

tt d . st t ch dh (100% ch ) t

tt.

Sealant uniformity of cure and sealant mix.

Lack of air entrapment and bubbles in thet.

Any deciencies observed should be reported in

th sg qty Ct l.

Dow Corningd t th tt thd

tdd ty ct cd. nth

t d ctc tht hd ctd

ch ty ct .

For special warranties and certain projects,Dow Corning y th cd th

ty ct .

Deglazing should be performed as a regularty ct cd dct

t. Th tt c d dy

y dct . addty, th tt

hd y d t h th

dd th d t

be replaced. When replacing the glass, a deglazect c y d. g c

effectively removed using a knife or piano wire.It is best to cut the sealant mid-way in the joint so

tht h t t th d t dh tt t d. a

dh tt, dcd th ,

c d th t.

f cdd cy

deglaze testing to be performed on a project:

1. First Deglaze 1 unit out of rst 10 unitsctd (1/10)

2. Second Deglaze 1 unit out of next 40 unitsctd (2/50)

3. Third Deglaze 1 unit out of next 50 unitsctd (3/100)

4. Through remainder of project, 1 unit of every100 t ctd

f th tc, ctct y Dow Corning Tchc sc e.


42/5242


Product Quality

Documentation

Th t d

ty ct dctt th

project. Dow Corning d th , ty ct tht c

used on their own or as a model for a customizedquality control manual. At completion of a project,

th ty ct t dd tDow Corning ty td.

Dow Corning recommends that projectdctt td t t th th

th ty. Th dct hd

t Dow Corning or local ofcials iftd.

a ch ty ct

SG project should include the following:

SG details that were reviewed and approvedyDow Corning

Dow Corning Project Checklist approvaltt()

Project substrate and materials descriptionsand specications

Dow Corning dh d ctty

tt()

In-house SG production and quality controlcd

Completed sealant production quality controllogs with glass test, buttery test, snap timett d t tt t

Completed sealant adhesion and cure qualityct th dh tt dy d

wet conditions, H-piece test and deglaze testt

Traceability documentation which allows eachdct t t cy ctd t

specic date, time and location of production.a dct t t d tht

they can be specically linked to the qualityct . Th t ch th

building should be marked on the elevationdrawing so that it can be easily identied if

d. Th tcty dctt ctc th t tht d t

be investigated on a project.

Dow Corning t y th dt

ch ty ct .

D pdct d qty Ct adt,

y ch ty ct

td.


43/5243


Product Quality

Production and Quality Control AuditDow Corning will audit the structural glazingdct d ty ct t

y Dow Corning Structural Glazingsc st. D th dt, th t

dct t, ty ct

cd d dctt td.

Dow Corning d cdt

t d th ct th th sg ct. f

th tt t tht

Dow Corning will be evaluating during an audit:

Production Facility Operations and Safety

Cleanliness of the production facility

Production facility temperature and humidity

Proper sealant storage and handling

Properly operating and well maintainedt d t

SG Design and material approved byDow Corning

Proper substrate handling

Compliance withDow Corning cddsealant application procedures: two-clothc thd, , t ct,

t, tc.

Storage and handling of production units

Compliance with reasonable safety proceduresincluding safe handling of ammable materialsd tct t

Quality Control

Compliance with Dow Corning tproduction quality control procedures: glasstest or buttery test, snap time test, mix ratiott

Properly completed sealant production

ty ct

Compliance withDow Corning dh dcure quality control procedures: peel adhesiontest, H-piece test, deglaze test

Properly completed adhesion and cure qualityct

Traceability documentation in accordancethDow Corning cdt

Commitment by management to train d t ch

ty ct .


44/5244


Product Quality

Maintenance and Repair

Structural glazing systems which utilizeDow Corning Structural Glazing Siliconest d t tc.

Dow Corning c t hty

tc t t-t ht, t,

ozone, acid rain and other natural elements.Dow Corning c t h d

ctct ct 40 y dt c t th d

t h h tt dc ddt

c hyc t. Th,

t d ctd tht th ct

c t d ht

-t c dd tht th

correct product has been specied and that thet h d ccdc th

Dow Corning cdt.

pdc ct th t d tct

glazing system is recommended. Some localt y dc ct y

ddt ty. Th tdd d

cy ct t tyc ct

frequency would be as follows:

1t ict - u ct thtt

2d Inspection 1 to 2 years after installation

3d Inspection 5 years after installationd y t 5 y ct

Method of inspection may consist of:

1. Visual inspection of structural glazing systemd tct c t. o y

dct t dh t

hyc ty ch.

2. Hand pressure on accessible sealant joints toy t dh

3. u sg ct cd ch

dcd asTm itt stdd

C1394.

athh c t y d t

tc, c t y

subject to mechanical damage such as vandalismor bird attack. Damaged areas can be repaired with

th c t. p ctctDow Corning th cdt.

sc t y h ch

c t cct

thc t, dt th

ctt. a ch c th t

c y . Th ch d t ct

th c th t. i ch c,

ctt c y d th th

t d d dtt. ad hch cd d th t.

p ctct y Dow Corning Tchc

sc e th tc

d.


45/5245


Product Quality

European SG Project ChecklistA European SG Project Checklist must becompleted for each project. The EuropeanSG Project Checklist can be accessed at

.dc.c. p ctct y

cDow Corning Construction Ofce for moret.

Project Name and Location:

Project Start Datedd//yyyy

ettd Ct Dt

Project Description: s. m sgFacade:

SG System Type: 4 Sided 2 Sided SG System Manufacturer:

Technical Contact: Email:

Phone: Fax:

Architect: Consultant:

General Contractor: IG Manufacturer:

DC Sealant(s) used:

lt g Hht () shtt g Hht ()

lt g wdth () shtt g wdth ()

D wdd (p) Ddd st (Y/n)

oth ld (p)Slope Glazing Angle

from Horiziontal

sd g v g ltd g it g

Total Thickness of

ot p ()

Total Thickness of

i p ()

DC IG Sealant Used: 3362 3793 ig Jt D. ( )

Proles Exposed tootd T. (Y/n)

Max. Prole Temp. (C)

a Steel Prole?

Max. Glas Temp. (C)

Tt DProduction (C)

pd stct btD ()

pd gThickness (mm)

Proles Tested/Approvedby DC? (Y/N) Document ID Number:

sg dt H b st w b st t DC (Y/n)

n/ stdd sg syt

Additional Comments:

993 756791 797895 oth


46/5246


Product Quality

SG Project Testing Submission

s t hd td thh

Dow Corning Coins hch c ccd

t .dc.c. p ctct y

c Dow Corning Construction Ofce for t d cc. Th

information is required with each SG projecttesting submission:

Project Name andLocation:

DC st() t

tested for this project:

C st()

Type (i.e. Anodized) s C lt n

Prole Description

Prole Description

Prole Description

mct Ty (.. Ctd) n/bd C

g Dct

g Dct

mct Dct n/bd C

oth stt

oth stt

mct Dct s n/bd

accy mt

accy mt

Description of sample type and size to be submitted to Dow Corning:

Aluminium or Steel Prole 4 c ty 20 c

Ctd, ed y ttd

3 c ty 20 c 15 c

accy mt (tct c,

gaskets, tapes, setting blocks, etc.)

2 c 2 th ty 10 c

s hd

t t th

address:

Dow Corning S. A. Parc Inustriel Zone C B-7180 SeneffeAttention: Sealants Testing Lab [email protected]

993 895 791 797 756 oth


47/5247


Product Quality

Sealant Production Quality Control Log

Company Name & Location:

Project Name & Location:

Dispensing Pump Type & Location:

Dt TT. &

Hdty

C/a lt

n

b lt

n

g

Tt

s

T

Tt

m

rt

Tt

Tt


48/5248


Product Quality

Sealant Adhesion Quality Control Log (Peel Adhesion Test)




Cleaning Solvent: p

Substrates: Primer Lot Number:

Dt TT. &

Hdty

C/a lt

n

b lt

n

p adh Tt

(% Ch f)Tt

Dy 1

Dy wt

Dy 2

Dy wt

Dy 3

Dy wt


49/5249


Product Quality

Sealant Cure Quality Control Log (H-Piece Test & Elastomeric Test)




Cleaning Solvent: p

Substrates: Primer Lot Number:

Dt TTemp. &

Humidity

C/a lot

numerbse lot

numer

H-piece

Test Dry

H-piece

Test wetet-

c

Tt

Tt

mp %Cf mp %Cf


50/5250


Product Quality

Sealant Adhesion and Cure Quality Control Log (Deglaze Test)




Frame Description: Cleaning Solvent:

Primer: Primer Lot Number:

Base Lot Number: Curing Agent Lot Number:

Glass Description: Frame Number:

Sealant Application Date: Deglaze Test Date:

rt d ot:

Measured SG Bite (Glass): Measured SG Bite (Frame):

Measured Glueline Thickness:

Joint Fill:

Sealant Mix:

Air Entrapment or Bubbles:

Sealant Adhesion to Frame:

Sealant Adhesion to Glass or Panel:

Sealant Cure Uniformity:

Other Observations:


51/5251


52/52

Dow Corning Construction Sales Ofces

uniTeD kingDom, eire,

norDiC CounTries, benelux,

souTH afriCa, miDDle easT

Dow Corning Ltd

Meriden Business ParkC D

ay, Cty, Cv5 9rg, uk

Tel: +44 (0)1676 528 000Fax: +44 (0)1676 528 001

ausTria, germanY,

polanD, swiTZerlanD

& easTern europe

Dow Corning GmbH

rht 34

D-65201 wd, gy

Tel: +49 (0)611 23 71Fax: +49 (0)611 237 603

franCe anD norTH afriCa

Dow Corning France S.A.S.

l bt bd e

D 20

69432 ly, Cd 3, fc

Tel: +33 (0)4 72 84 13 83Fax: +33 (0)4 72 84 13 79

spain & porTugal

Dow Corning Ibrica S.A.

ad D 613 5 t

08028 bc, s

Tel: +34 93 363 69 28Fax: +34 93 363 69 01

iTalY & easTernmeDiTerranean CounTries

Dow Corning S.p.A.

Palazzo TintorettoCentro Direzionale Milano Oltrev C 224

20090 - st, m, ity

Tel: +39 02 98 832 1Fax: +39 02 98 804 83

russia, Cis

Dow Corning Representation Ofce

17/23 Taganskaya Streetmc 109147, r

Tel: +7 495 783 6648Fax: +7 495 783 6652

TurkeY

Dow Corning Liaison Ofce

Halk Sok. Pakpen Plaza No:44 Kat: 1034734 Kozyata, stanbul, TrkiyeTel: +90 (0)216.4677645Fax: +90 (0)216.4673909

www.dowcorning.com

European Technical

Information Center

Dow Corning GmbH

rht 34

D-65201 wd, gy

Tel: +49 (0)611 23 71Fax: +49 (0)611 237 601

Documents

Silicone Structural Glazing