scope:

Material Description. This specification covers the basic requirements for fluorocarbon post treatments. It is supplied in black color unless otherwise specified. The coating system is free of hexavalent chromate, with no hexavalent chromate in the final product per GMW3059 requirements, GMW3034 will be used as a referee test. The coating can be applied over any combination of zinc phosphate, zinc plate, iron phosphate, or grit blast pretreatments. Substrate pretreatment requirements, where they exist, are to be shown separately on drawings or applicable documents.

Symbols. Not applicable.

Applicability. This coating is suitable for simple formed metal parts, castings, clips, and other ferrous parts which are not adversely affected by baking temperatures in the range of 150 °C to 190 °C. These coatings may also be used to reduce friction and wear on material surfaces or as an anti-scuff type finish. This specification covers three (3) thicknesses of coatings (8 μm, 13 μm and 18 μm). The thickness is specified on the part drawing by a suffix code as listed in Table 1, and Section 8 of this document. This coating is not recommended for use on threaded fasteners. Consult GM Fastening Engineering for suitable alternatives.