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.)ar:~2i?f[~ 1249 Part 12 ~ ,;)-_;:J-~?' ..-- ­

""'Thq tftic;:kness of a pane of glass·shall be measured, to en accuracy of 0.01 ml'J1. at thecentre of each of the four edges of the pane. Each measurementtaken shall be within the limit

de'/iations s:lecified. The thickness of cast glass shall be measured using ~a mi­crometer wi~h 50 mm diameter platE;.:l. .

• If"there are fetcntion polnts onthe panes necessitated by the manufacturing prclcess, measurements shall, not be taken

,- dir~ctly aUh!r:Se points." ."'-. ­

4.2 'L-;ngtti'~ad-:~~~-: /

Table 2. Length lind width , .Le!'lQ'll afIdwidth of ~nes Llrnlt deviation

Up to 500 ±1·)

Over' 500 up to 1000 :I: 1.5·)

Over 1 000 up to 1500 :f:2

. Over 1 500 up to 2500 ...

; pver2500 up to 3000

·;::..Qver3000 Up to 3500

Over 3500 ~.'-

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=3

±4

:1:5

'

*) Umit deviations of ±2 mm for glassthickness of 8 mm and more. '

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. · ·:~:.,?tL' .. :;.-. '. .I~ ;~'.~~:~~:~!.,t~in~ to~:ze I--A rect~'ng~l~r pane of 9.iass which is to be square must I· inscribea rectangle of the maximum permissible size (dashed

:; I .. line) andcfrcumscribe a rectangle of the minimum permis­! t:' I· sibl~;~~~:,(c:~ai.J;lljneHCf.figure 1).

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~. .: _. ..' .! I Permitted form .l l~1::'i~··11

i L ~:.:....~~~.....: :. Minimum permissible size IL ::.II

Figure 1. Example of a rectangular pane

The maximum' and minimum, permissible siies' are deter­mined with allowan.ce being made for the same tolerances (ct. table 2) on the nominal size of the glass pane. Cutting to size of glass ofother geometrical shapes shall be based on the principle outlined .above.

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4.~ Straightness y/';. Out-of-straightness of a pane is a function of its' thickness, Us

.J Out-of-straightness can occur along the edge of a pane over relatively short sections.-Overa section 300 mm long, the per­missible out-of-stralqhtness, h'hshall be 0,3 mm for all glass

•types except cast glass.It shall be measured usingastraight­edge at. a distance of 25 mm from the edge of the pane,

300

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Straightedge

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4.4.1 Out-of-straigll,tness measured over the length / ot the pane . V

Table 3. Straightness tolerances

Nominal Straightness tolerance, Glass type .thlckness to. related jo length

as In table 1 of pane

Clear floal! polished plate

4 . and

5

6 "

to 15

4 to 15

6

1,0% '

i 0,3%

1,0%'

Clear floatl polished plate

-" '

Sheet. cast end other types

Surface-coated .to, . - 0,3% 15 - ~

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The pane of glass shall be placed in almost vertical position between two blocks and the greatest distance between the curve of the pane surface and the notional chord at the edges, h,•shall be measured on the concave side of the pane using a straig~tedge. i .

Straightedge '\

j . \ r,

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Glass edge

Rgure 2. Meas,urement of out-at-straightness hi

4.4.2 Straightness measured over a 300 mm long section

length andwidttl'and the ratio of both, a distinction being' madebetween out-Of:straightness measured over the length

..otthe paneand,thatmeasured over a 300 rnrntonqsection. Measurement of out-of-stralqhtness h2 .Figure 3. ... - ~~'~·;''':'~:'''':'':''''~l''~:.':' ~.~.~. ',' " ..•...••• _ ~"''''''. '" ~ u.. ':ge:eo

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'·1· \:ti D1N1249Part 12 Page 3 :;'

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.. 4.5 Drilled panes 8 Retention points The diameter of drilled holes in panes shall be not less than Depending on the production process used by the manufac­

· their thickness. turer,lt may stili be possible to see where glass has been held in position. These points of retention shall preferably be ·Ja6le 4. Hole diameter located on one of the shorter sides.

· . ,- ­Nominal diameter . ...

Umit deviations

4 to 20 ±1 .. Ov~;'26 'lip-to ''',00

-±2

Over'1oo Manufacturer to be consulted.

s Texture

In cast glass with a linear texture, the lines shall be parallel to the long edge of the glass unless otherwise agreed.

10 Anisotropy if, under certain conditions, toughened glass is looked at in, polarized. light, polarization fields may be visible, the pattern

5 Designation , they produce on the glass'being characteristic of toughened

Designation of toughened glass (ESG}, 1600 mm wide and 2800 mm long, and with a nominal thtckness of 6 mm: Toughened glass DIN1249-ESG -6-1600-2800

6 Work on glass 6.1 Edgesi i

I i Panesshall, as a minimum, have no sharp edges (cf. DIN1249 Part 11).

J ..........

6.2 Drilling holes and cutting out Drilling holes and cutting out is only permitted prior to the glass being prestressed.

i 6.2.1 Holes The minimum distance of a hole edge from the glass edges and from other hole edges shall be twice the glass thickness. If there' ar~ more than four holes in any configuration, the manufai:turer shall be consulted regarding minimum distances. If ahole is drilled in the corner-of a pane so that a . hole edge is 'less than 35 mm from the glass edge. the cor­responding distance from the other edge shall be at least 5 mm greater.

The limit deviations on distances shall be on the lines of table 2.·1

,I 6.2.2 Cutting out , I The many possibilities of cutting out cannot be dealt with f,a~ here. The extent and location of cutting out shall be subject to

~~~ agreement with the manufacturer.

. 7' sample panes Given the wide. variety of glass and pane types, the size of sample,panes shall be subject to agreement with the manu­facturer.

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Table.S;: Num.ber and size of fragments In DIN 52349 testI ,

glass.

11 Physical requirements 11.1 Resistance to fracture

If toughened glass is tested as'specified in DIN 52349. the number, size and length of fragments shall be not more than given in table ~.

11.2 Bending strength When tested as specified in DIN 52303, toughened glass shall be found to have a minimum bending strength as given in table 6. '

j .... Table 6. Minimum bending strength or c- r,.I'

~)-

". ,~I~ss' type

Clear f1oaUpolished plate

Cast, sheet and other types

Surface-coated (clear f1oaUpolished plate, with coating on surface and in tension zone)

Surface-coated (clear floaUpolished plate, with coating on surface and in compression zone}

MinirrfumNomlnal,c; bendingthickness ~.~

as in table f. .strength-).

4 to 15

4 to 15

ln N/mm2 ,

.. 120

90

'75

6to 15

I 120

*} Defined here as the minimum bendlnq-stress result­ing in a probability of failure of 5 % for a ~5 % con-.· fidence level.

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Minimum number '\ Maximum area Nominal of fragments. of largest fragment, thickness. ~Iass type (over 10 cm X 10.cm in cmzas In table 1 test area)

"

Clear float/polished plate . 15 25.4 and 5

Clear float/polished plate "',, 30 15.6 to 15

Cast, Sheet and other types 15 254 to 15

SUrface coated. 306 to 15 . 15

Maximum length of longest fragment,

incm.

.. :18

12

18

12

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..-!i' ; . o'ag~J4,D1N 1249 Part 12

12~ Marking

Each pane of toughened glass shall be indelibly marked with at least the following: DIN 1249-ESG

The marking shall be visible on installed panes uncer normal conditions.

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. Standar~s. referred to , DIN 1249' Pail 'f-Glass.for use in building construction; sheet glass; dimensions

, DIN, 1249 Part 3 Glaes'for us-e in building construetlon: clear float and polished plate,glass; dimensions

DIN 1249 Part 4 Glass for use in bUilding construction; cast glass; dimensions

. DIN '1249 Part 11 Glass for use in building construction; work on giass edges , DIN 1259 Part 2 Glass products; terminology

DIN 52303 Part 1 Methods of testing flat glass for use in building construction; determination of bending strength with speci­mens suppo:ted ..t two points

DIN 52 349 Testing of glass for use in building construction; fracture pattern

• International Patent Classification

i,(') 03 B 27/00 ,-c.06 B 3/00

E 04 C 2/54

G"01 821/00

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