Foam Types

[Name]| TXL-752 | [Date]

Foam Types DIFFERENT KIND OF FOAMS AVAILABLE TILL DATE

DIFFERENT TYPES OF FOAMS

CLOSED CELL FOAM

1. Ethafoam (Polyethylene) : Polyethylene foam, strong, resilient,

lightweight, flexible, solid extruded,

medium density (220-as)/high

density (600), closed-cell foam.

Uses: Shock absorbing, vibration damping,

insulation, impervious to most chemicals, Closed

foam, and as a material for cushioning components

in packaging applications for loading up to 17.5

kPa(220-as), 69kPa(600).

Formulated with anti-static properties to safely

protect sensitive electronic equipment during

shipment and storage, outstanding dimensional

stability and recovery characteristics that provide optimal cushioning protection against repeated impacts, it is

ideal for cushion packaging and is used in many computer and electronics application.

Physical properties Direction Value (220-as) Value(600)

Density 35.2 kg/m3 96.1 kg/m3

Static Decay Rate < 2 sec

Compression Set Vertical < 20% (50% compr.) < 15% (50% compr.)

Compressive Creep

(1000 hrs @ 23 c)

Vertical < 10% (17.5 kPa) < 10% (69 kPa)

Thermal Stability (ISO 2796)

< 2% < 2%

Thermal Conductivity

24 c / -5 c

Vertical .42 / .37 (W/m K) .42 / .37 (W/m K)

Water Absorption < 3% by volume < 1% by volume

Tensile Elongation Average 50% 55%

Tensile Strength @ Peak Average 220 kPa 552 kPa

Tear Strength Average 1.75 N/mm 5.3 N/mm

Volara (Cross-linked Polyethylene foam):

Flexible closed-cell polyethylene foam

that is cross-linked by means of a unique

electron irradiation process. This results in a

continuous smooth surface foam with a fine cell

structure and excellent mechanical properties.

Good mechanical properties at low densities, low

water absorption and vapor transmission,

excellent thermal insulation, excellent chemical

resistance, smooth aesthetically pleasing surface.

USES: cap seals, medical tape, sports padding

Physical properties

Direction Value (2 pcf) Value (4 pcf) Value (6 pcf)

Density 1.8-2.2 pcf 3.6-4.4 pcf 5.4-6.6 pcf

Compression Set 28 18 14

Thermal Stability (ISO 2796)

M

CM

-2%

-1%

-1.5%

-0.7%

-1.0%

-0.7 %

Thermal Conductivity

21 c

.25 (W/m K) .30 (W/m K) .32 (W/m K)

Water Absorption (lbs/sq. ft. of cut surface)

.04 .04 .04

Elongation To Break M

CM

124 %

88 %

177 %

126 %

203 %

140 %

Tensile Strength @ Peak

Average 60 psi 123 psi 177 psi

Tear Resistance (lbs/inch)

M

CM

6

11

15

24

24

35

- = shrinkage M=machine direction, CM = Cross section machine direction

Rebonded Flexible Foam (moulded polyurethane):

Bonded foam, or rebound, is a moulded polyurethane product made from pieces of shredded flexible polyurethane foam held together with a binder. It relative high density and excellent resilience make it suitable

for applications including vibration sound damping,flooring, sports mats, cushioning, packaging and carpet

underlay.

Density kg/m3 60 300

Tensile strength kPa 40 150

Elongation at break % 40 90

CLD hardness at 10 % compression

at 20 %

at 30%

4 20

5 50

15 - 150

Neoprene foam:

Due to the superb air tight and water tight properties of expanded Neoprene foam (also known as neoprene sponge) it is generally used within the automotive, electronic and construction trades.

Its properties also make it suitable for requirements including thermal insulation on items such as garage door

seals.

Closed cell structure making it impermeable to air and water and therefore an ideal material for sealing against air and/or water.

Outstanding aging properties and will not go brittle over time.

Very durable and relatively cheap.

Flexible material.

Good UV, ozone, sunlight and oxidation resilience.

Flame retardant.

Good resistance to oil and many petroleum derivatives and chemicals.

Density: lb./ft3 (g/cm3) 6 + 2 (0.096 + 0.032) Hardness 45 + 5

Compression Deflection 25%psi (kPa) 3.5 + 1.5 (24 + 10)

Compression Set %

Good UV resistance.

Good mechanical properties.

Wide temperature range.

Cellular Structure Closed Cell

Shore Hardness .02 g/cc

Compression Deflection (00 scale) 5-9 psi

Compression Set (50%) 25% max

Water Absorption 5% max

Linear Shrinkage 10 days / 23 C 3% max

Elongation at Break 90 % minimum

Tensile Strength 65 (min) lb/in

Max Use Temperature -40 to 100 C

Air & UV Resistance Good

Ozone Resistance Very Good

EVA Foam (Ethylene vinyl acetate):

Light weight, shock resistance and high elasticity, odorless, good mechanical strength, excellent chemical resistance, high buoyancy, low water absorption, good acoustic properties.

USES: athletic padding, thermal insulation, thermoformed protective covers, a variety of other uses which require good chemical or water resistance.

Physical

Properties Units 2 lb 4 lb

VS

Foam

9115

VS

Foam

9125

VS

Foam

9135

VS

Foam

9145

VS

Foam

5555

VS

Foam

5565

VS Foam

5575

Firm

6 lb

Firm

9 lb

Hardness Duro 'A' ---- --- 15-25 20-30 30-40 40-50 50-60 60-70 70-80 34-45 45-55

Density lb/ft3 1-3 3-5 5-7 8-10 11-13 13-15 14-17 16-19 19-23 5-7 8-10

25%

Compression

Deflection

psi 3 5-10 10-15 20-30 30-40 50-60 -- -- -- 40 50

Compression

Set

% of

Original 15 10 10 10 10 10 7 7 7 25 20

Tensile

Strength psi 30 50 180 225 350 375 375 450 480 150 300

Ultimate

Elongation percent 150 150 250 300 300 350 175 200 150 50 50

Die C Tear lb/in 10 15 25 35 50 60 60 75 90 40 50

Water

Absorption lb/sq ft

Tensile Strength Psi 25 minimum

Compression force 25% deflection Psi 1.5-3.0

Compression Set 50% 35 maximum

Temperature range F -40 to 220

Water Absorption 10% max

Thermal stability (% change in length, 7 days @ 220F)

10% max

Thermal conductivity BTU-IN .290 max

Ozone Resistance Pass

Silicone Sponge:

Made from gum based polydimethylsiloxane (PDMS).Expansion process creates the closed cell sponge structure, creating compressible air pockets.

Wide operating temperature - Silicone sponge has a temperature range of -100F to 500F (-73C to 260C).

Water sealing - the closed cell structure allows for good water sealing with relatively low compressive forces.

Compression set resistance - Silicone offers excellent compression set resistance (ability to rebound to original thickness), especially at higher temperatures, compared to most rubber material. Low compression set silicone sponges are available for even better performance than general purpose grades.

UV and ozone resistance - Silicone products have excellent UV and ozone resistance due in part to their inorganic backbone. This provides long term performance.

Rugged - When silicone is required, silicone sponge parts offer better toughness as compared to silicone foam products.

Outdoor gasketing - Considering all the above benefits, silicone sponge is a good material choice for outdoor environments, from the Arctic to the desert.

Flame retardant silicone sponge (R10400 M):

Property Unit Value

Density Lbs./ft3 (kg/m) 35 (560)

Compression Deflection Psi (kPa) 10 (69)

Elongation % 250

Tensile Strength Psi (kPa) 100 (690)

Compression Set % 10

Tear Strength ppi (kN/m) 20 (3.5)

Water Absorption % 1

Operating temperature F (C) -100 to 500 (-73 to 260)

SILICONE SPONGE OR SILICONE FOAM? WHAT IS THE DIFFERENCE?

Silicone foam is manufactured from a low viscosity liquid silicone which is cast on a smooth liner and cured

through inline ovens. Silicone foam can be supplied as an open cell, closed cell or combination of both, open

and closed cell material.

Silicone sponge, on the other hand, is mixed and calendared on a rubber mill then cured via inline ovens or

stationary mold press.

Silicone foam is typically lighter in density, compresses with less force and has a lower compression set than

silicone sponge. Both products have good sealing properties, however the sponge has higher tensile strength

and the foam has better flame resistance.

Composite foam:

Honeycomb:

Polypropylene Honeycomb: Tough and durable, strong impact resistant, resistant to moisture, high

sound and vibration attenuation.

Aramid (Nomex) Honeycomb: Aramid fiber paper is an excellent lightweight non-metallic core material.

Nomex offers excellent resiliency, low density, corrosion

resistance, flame retardancy, and good compressive strength

to weight ratio.

Kevlar honeycomb: Better than Nomex,

particularly in compressive strength.

Carbon-fiber Honeycomb: Carbon fiber can also be used as a core material; however cost is high. Limited to space application, e.g. Satellites, where weight saving is critical and thermal expansion need to be

kept at a minimum.

Metal honeycomb: Various metal are used according to the application and property needed,

Aluminum is common metal. The compressive shear strength of aluminum honeycomb are excellent.

Foams: Foam cores produce extremely lightweight composite structures. High density foam cores provide greater resistance to

compression and crush, as well as provide damage tolerance from

impact. Low density foam cores with carbon-fiber face sheets,

Airex foam core: Airex is a closed cell, cross-linked polymer foam, which is lightweight and has good impact strength.

Depron foam core: Depron is an inexpensive, non-structural foam. A Depron carbon fiber foam core laminate has excellent strength

and stiffness in bending; however, lacks the compressive strength and

crushing resistance of a structural foam core.

Divinycell foam core: Divinycell foam core is a medium density structural foam with very high strength, often used for heavier duty applications where lighter density foams may not work. In particular,

Divinycell H100 is an excellent damage tolerant foam, and is ideal for applications that require resistance to

impact and local crushing.

Wood

Balsa wood: Balsa wood, when used as a core material in composite fabrication, offers a very high strength and stiffness to weight ratio. End grain balsa

provides exceptionally high shear, tensile and compressive strengths for its weight.

Balsa is also a renewable resource, with typical balsa trees maturing to 90 feet in

seven years.

Birch plywood: Birch plywood is higher density than balsa wood, providing a durable final product

with excellent compressive strength, resistance to local crushing, and machinability.

OPEN CELLED FOAM

Dry fast foam (polyurethane foam):

Dry fast foam is an outdoor foam which has open cell structure and is perfect for areas

where cushions get wet. Dries almost

immediately after exposure to: rain, salt spray,

melting snow, morning dew, washing, or other

type of moisture and humidity. Large, open pores

permit maximum water drainage and air

circulation, allowing use quickly after being wet

or even saturated. Dryfast foam formula is anti-

microbial and help suppress microorganism

growth, common in damp area.

USES: outdoor furniture, boat or marine

cushions, pool, filtering for whatever is exposed

to large amount of water.

50 ILD EZ-Dry Foam

Pore size 35 ppi

Density 2.0 lbs./ft3.

Tensile 8 psi

Elongation 25 %

Tear 2 lbs./in

Compression Set 50% 15 %

Properties:

Compression set max : Vinyl/nitrile>Volara>Neoprene>EPDM>Ethafoam>Dry foam>EVA>Silicone Sponge

Tensile Strength :EVA>Silicone sponge>Volara>Neoprene=Ethafoam>rebonded>EPDM>Vinyl/Nitrile>Dry

foam

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Foam Types