Silicone Sponge UL 94 V-0 | Flame Retardant | National Silicone

Medium Flame Retardant Silicone Sponge

UL 94 V-0 Closed Cell Silicone Sponge Rubber

This medium firm closed cell flame retardant silicone sponge is typically a grey or black color and is rated UL 94 V-0. Passing the vertical burn test, which is more stringent than horizontal test (HB), is seen as a critical safety standard for applications where flame and fire protection is of the highest importance. The material is produced with a fabric impression on both sides, is flexible and offers excellent compression set resistance.



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



  • UL 94 V-0
  • AMS3195



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 – Grey, black, color matching available



-103°F to +450°F  (-75°C to 232°C)



Compression deflection (25%) psi (kPa) 6-14 (41-96) 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) 100 (690) ASTM D412
Flammability V-0 rating UL 94

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



More Information

UL 94 V-0

  • UL 94 V-0 is a safety and flammability standard by Underwriters Laboratories.
  • This material is compliant with the UL 94 V-0 test standard for flammability.
  • The vertical burn test measures the self-extinguishing time of a vertically oriented polymer specimen. The test evaluates both the burning and afterglow times and dripping of the burning test specimen.
  • In order to be rated UL 94 V-0, the burning must stop within 10 seconds, no flame propagation or dripping.



  • AMS3195 is an aerospace material specification is from SAE International Group.
  • The specification covers silicone rubber sponge in the form of sheet, strip, extrusions, and molded shapes.
  • Our medium density silicone sponge sheet is in accordance with the physical property requirements of AMS3195 test standard.
  • This product has been used typically for general applications requiring closed-cell, medium sponge rubber that will be flexible from -103 to +401 °F (-75 to +205 °C), but usage is not limited to such applications. Compression set may be high at the higher temperature.




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