Soft Silicone Sponge Rubber Sheet | National Silicone

Soft Silicone Sponge

Closed Cell Silicone Sponge Rubber

This low compression set, soft density silicone sponge is ideal for demanding sealing and gasket applications. It is produced with a fabric finish on both sides, is flexible and can handle extreme temperature environments. Our soft silicone sponge offers excellent compression set resistance and can maintain its resiliency under extended compression.



  • Excellent for seals and gaskets
  • High compressibility
  • Low compression set
  • UV/Ozone resistant



Available in – Continuous rolls or cut sheets
Thickness available (in) – 0.0625 to 0.500
Typical roll lengths (ft) – 25 to 100
Typical roll widths (in) – 36
Surface finishing – Fabric impression finish, both sides
Cell structure – Closed cell
Color – Red/orange, grey, black, color matching available



-99°F to +450°F  (-73°C to 232°C)



Compression deflection (25%) psi (kPa) 3-8 (21-55) ASTM D1056
Density < 0.25” thick pcf (kg/m3) 43 (690) max. ASTM D1056
Density ≥ 0.25” thick pcf (kg/m3) 34 (550) max. ASTM D1056
Compression set (22h, 100°C) % 60 max. ASTM D1056
Tensile strength psi (kPa) 33 (225) min. ASTM D412

More information found on the full specification sheet. Go To Datasheets



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