GMW16392 Automotive Silicone Foam | National Silicone

Medium Grade Silicone Foam

Closed Cell Automotive Silicone Foam

This medium density automotive purposed silicone foam is approved and listed for GMW16392 Class 2 Type 2 on the international General Motors MATSPC database. Leveraging 10+ years of experience and engineering capability, we developed a silicone foam fully meeting the demanding GMW standard. In areas such as tensile strength and elongation this product far exceeds any minimum requirements or expectations.



  • Excellent water impermeability under pressure
  • Resistance to long-term environmental conditions
  • Extreme high and low temperatures
  • Low compression set
  • UV/Ozone resistant



  • GMW16392 Class 2 Type 2
  • Rechargeable Energy Storage Systems (RESS)



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



-103°F to +450°F  (-75°C to 232°C)



Properties Unit Requirement Test Method
Compression deflection (25%) psi (kPa) 6-14 (41-97) ISO 3386
Density pcf (kg/m3) 28-31 (450-500) ISO 845
Compression set (24h, 100°C) % (10) max. ISO 6916-1
Tensile strength psi (kPa) 24 (165) min. ISO 1798
Elongation % 50 min. ISO 1798

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


National Silicone GMW16392 Class 2 Type 2


More Information


  • GMW16392 is an automotive specification from General Motors.
  • This specification covers silicone foam materials used for sealing various components within vehicles. These silicone foam materials are recommended for applications where the operating temperature range is -55 °C to +200 °C. Materials can be produced in continuous rolls, sheets, or cast bun blocks.
  • Our material is approved and listed for GMW16392 Class 2 Type 2 on the international General Motors MATSPC database.
  • Material Class II: Closed Cell Foam.
  • Material Definition: Type 2 – This is a medium modulus (medium cellular) foam, which can be easily compressed and used as noise isolation and as an air, dust, and fluid seal.


Rechargeable Energy Storage Systems

  • This silicone foam meets the rechargeable energy storage systems (RESS) requirements for compression set and water impermeability, making it safe to use in electric and hybrid electric vehicles. Best suited for use in fluid and dust seals, vibration isolation and battery cell alignment.




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