scope:

Material Description. This specification covers silicone foam materials used for sealing various components within vehicles. These silicone foam materials are recommended for applications where the normal temperature range is -55 °C to +200 °C. Materials can be produced in continuous roll, sheet or cast bun blocks.

Material Class and Type. Products qualified to this specification shall be identified by Class (cell structure) and Type (compression force deflection ranges per ISO 3386-1 at 25% compression).

Material Class Definition.

Class l: Open Cell Foam

Class II: Closed Cell Foam

Material Type Definition.

• Type 0: This is a very low modulus (ultra-soft cellular) foam, which can be easily compressed and used as noise isolation and as an air, dust and fluid seal.
• Type 1: This is a low modulus (soft cellular) foam, which can be easily compressed and used as noise isolation and as an air, dust and fluid seal.
• 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.
• Type 3: This is a firm modulus (firm cellular) foam, which can be easily compressed and used as noise isolation and as an air, dust and fluid seal.
• Type 4: This is a very firm modulus (extra-firm cellular) foam, which can be easily compressed and used as noise isolation and as an air, dust and fluid seal.

Certain applications may require the use of an adhesive. If an adhesive (ADH) is required, an ADH suffix shall be added after the basic specification and type number (e.g., GMW16392 Class II Type 2 - ADH). If an adhesive is specified, the adhesive backed material shall meet the requirements of GMW16443, see Table 2.

Symbols. Not applicable.

Applicability. This material is used as a primary seal for air, dust and automotive fluids where exposure to high temperatures and/or low compression set is required.

Remarks. Not applicable.