Silicone sponge is an excellent material for gasketing applications that require a soft compressible material. It is resistant to extreme temperatures and offers good compression set. It is available in Soft, Medium, Firm, and X- Firm Densities. Medium Density is the most popular. It is available in many colors. Generally the surface has a fine fabric finish on both sides and is available in continuous rolls up to 1/2" thick and sheets up to 2" thick. See attached Sponge Closed Cell price list for standard pricing and product offerings.

The given values are typical properties and are provided for information only. They should not be used to set specification requirements. It is up to the end user to determine whether the material is suitable for the intended application.
Unit of Measure


Cell Structure

N/A Closed

Surface Skin

N/A Fine Fabric


N/A Silicone


N/A Closed Cell Sponge

Density Under 1/4" thick

N/A 0.033 lbs/in³

Max. Density Under 1/4" thick

N/A 0.035 lbs/in³

Density Over 1/4" thick

N/A 0.028 lbs/in³

Max. Density Over 1/4" thick

N/A 0.030 lbs/in³

Compression Deflection

N/A 25 psi

Compression Set, 22 hrs @ 212ºF

N/A 35 %

Max. Compression Set, 22 hrs @ 212ºF

N/A 60 %

Temperature Range

N/A -103 to 450 ºF

UV/ Ozone Resistance

N/A Excellent

Approx. Dielectric Strength

N/A 150 V/mil

Max. Water Absorption

N/A 5 %

Tensile Strength

N/A 300 psi


N/A 250 %

Lead Time

N/A Call or Email Customer Service



  • Extreme High & Low Temperatures
  • High Compressibility
  • Low Compression Set
  • UV / Ozone Resistant
  • Excellent Gasketing Material

Additonal Specifications


  • MIL-STD 670