GMW GMW18630 PDF

This specification covers the qualifications and performance requirements for flexible, exterior, one-component (1K), solventborne basecoat/1K solventborne clearcoat topcoats for use over plastic substrates, typically thermoplastic olefin, over a bake latitude of approximately (115 to 135) °C ((240 to 275) °F). This topcoat system is not intended for use on large exterior surfaces such as fascia, spoilers, and rocker panels on vehicles produced for the North American market.

Note: Nothing in this standard supercedes applicable laws and regulations.

Note: In the event of conflict between the English and domestic language, the English language shall take precedence.

Purpose/Material Description.

Basecoat (BC) components of these systems are typically 1K (solvent) acrylic/melamine. Clearcoat (CC) components of these systems are 1K (solvent) technologies with varying cross-linking chemistries, but typically acrylic/melamine. Typical volume solids as sprayed are typically (35 to 50)% for BCs and (45 to 60)% for CCs. Each combination of specific BC and CC shall be tested and approved as a BC/CC system. The individual components are not interchangeable and are approved for use only with combinations of BC/CC of the total paint system which was used in the qualification testing. It shall also be compatible with specific adhesion promoters and/or primers used with specific plastics. This specification shall be used in conjunction with the GMW14797, Approved Paint on Plastics Systems (APOPS), a section of GM Materials Approved Source List (GMMASL) which lists approved substrate, cleaning, priming, and topcoat combinations.

Symbols.

Not applicable.

Applicability.

These topcoats are designed to be applied over an approved adhesion promoter or baked primer. All thermoplastic polyolefin substrates using GMW18630 shall be applied over an adhesion promoter (9984808 or GMW18415) or flame treatment per GMW16133.

Remarks.

None.