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Flexible, compressible COHRlastic silicone closed cell sponge is designed for high-performance gasketing, thermal shielding, vibration mounts and press pads. It is available in six constructions.
R10470, a general-purpose silicone sponge, can be used in most applications.
R10480 has extremely low compression set and maintains its resiliency even under extended compression.
R10460 is flame retardant.When held in a vertical position and exposed to a 2,000 °F flame for 12 seconds, there is no residential flame and less than a 10 second afterglow. Like R10480, it is especially resistant to compression set.
R10450 silicone sponge with fiberglass reinforcement is a unique construction. It has the compressibility of sponge, plus dimensional stability in the X-Y direction. The absence of stretch contributes to the consistent size and shape of die cut parts and eliminates outward extrusion under pressure.
R10490 fluorosilicone sponge rubber can be used as a gasket where it is necessary to contain fluids that would degrade normal silicone sponge and solid materials (special order basis).
R10404 closed-cell conformable silicone rubber sponge is designed for use where both conformability and heat transfer are necessary, such as between printed circuit boards and heat sinks, decal transfer or applying heat activated adhesives.
Unit of Measure

Test Method Water Absorption

N/A D1056

Water Absorption

N/A Less than 5 %

Dielectric Strength

N/A 145 V/mil

Thermal Conductivity (Average)

N/A 2.6 x 10-4 x (cal·cm/ºC·cm·s) 0.75 BTU in/h·ft2 ºF

Specific Heat

N/A 0.3 BTU/lb/ºF
Linear Thermal Expansion1 N/A 1.8 x 10-4 in/in/ºF

Outgassing (NASA Testing)

N/A Less than 1% weight loss (after 24 h at 257 ºF in vacuum)

Width/Sheet Size

N/A 36 x 36 in


N/A Red


N/A 1/8 ±1/32 in3/8 ±3/64 in1/2 ±3/64 in3/16 ±1/32 in1/4 /+3/64 to –1/32 in

Test Method Compression Deflection

N/A D1056
Compression Deflection2 N/A 5 psi

Test Method Tensile Strength

N/A D412

Tensile Strength

N/A 50 psi

Test Method Elongation

N/A D412

Elongation at Break

N/A 75 %

Test Method Compression Set

N/A D1056

Compression Set (Compressed 50 % for 22 h at 212 ºF)

N/A 5 %

Test Method Density

N/A D3574


N/A .012 lb/in
  • 1 Room temperature to +350 ºF
  • 2 Compressed 25 % at room temperature