GMW GMW16750 PDF

Material Description. All types of foams described in this specification are polyurethane open cell foam based on polyether or polyester chemistry. For molded, cast, and slab polyurethane foam for sound absorbing applications that will not see a continuous temperature environment over 121 °C, or short term temperature over 149 °C, refer to GMW14196: Polyurethane Foams for Acoustic Applications. For elastomer polyurethane foams for sealing and vibration handling applications with densities of 210 kg/m³ to 270 kg/m³ and minimum of 15% bio-renewable and a minimum of 25% post automotive shredder residue, refer to GMW16515: Flexible Expanded Material for Air, Dust, Water Sealing and Noise Vibration Handling Applications. For slab/sheet polyurethane foam for Engine Compartment Sound Absorber (ESCA), refer to GMW16869.

Symbols. Not applicable.

Applicability. The polyurethane material specified in this standard is recommended for use as follows.

• Automotive high-temperature acoustical applications or as a decoupler.

• Gasket for vibration damping and vibration and shock insulation.

• Air, dust, water seal and/or light seals.

• Squeak and rattle applications.

• Seal and gasket applications.

• Energy absorber and interior trim applications.

This specification segments these polyurethane materials into seven types. The seven types are based on material performance and product application, and they do not address the actual part design. These standards are to be considered minimum compliance. Optimum conditions for maximum product performance may require values different than those shown in the specification, but this will be program and part specific.

Remarks.

Recycled or Alternate Materials. Recycled polyurethane materials or bio-based materials may be used for parts under this specification. Prior to incorporating recycled or bio-based materials into a finished product, the supplier shall provide data to GM Materials Engineering showing that no decrease in performance or durability will occur due to the use of the recycled polyurethane materials or bio-based materials.