General Motors Company

Anti-Condensation Coatings for Exterior Lighting Applications - Issue 2; English
 N GMW16508

Annotation

Material Description. This specification covers the qualification requirements for a clear anti-condensation coating to be used on the inside surface of the outer lens of an exterior lamp assembly. The coating shall prevent or disguise all traces of moisture buildup on the inside of the outer lens.

Material qualified to this standard is based on the anti-condensation coating performance. Coating technology is unique to each coating supplier. The material description of each coating technology is required at the time of approval.

These coatings are part of a total coated product system and must meet the requirements set forth in this specification and those shown on engineering drawings.

Initial approval of an anti-condensation coating per this specification must be evaluated and approved for each substrate.

This specification shall be used in conjunction with the Approved Paint on Parts System (APOPS), a section of GM Approved Materials Source List, which identifies approved substrate, cleaning, and coating combinations

Note: GM APOPS is required for the Production Part Approval Process (PPAP) of the exterior lamp assembly.

Types. Anti-condensation coatings to this specification were developed for the following substrates:

• Type A: Polycarbonate (PC) substrates, maximum cure temperature (thermal exposure) of 120 °C. (e.g., GMW16729)

• Type B: Poly(methyl methacrylate) (PMMA) substrates, maximum cure temperature (thermal exposure) of 80 °C. (e.g., GMW16335)