GMW GMW14668 PDF

This specification covers basic requirements for copper-nickel-chromium electroplated plastic parts, including assemblies.

Material Description. Platings to this specification are intended for interior (code A) and exterior (code B) applications with two levels of corrosion protection. For exterior applications, discontinuous chromium plate microporous (mp) or microcracking (mc), in addition to a multiple layer nickel system, shall be used. Interior applications do not require the use of discontinuous chromium or multiple layer nickel systems. For interior applications non-discontinuous chrome (r) is permissible. Exterior plastics plated to this specification are further subdivided into application types: Type 1 which receives little or no stone chipping exposure on a vehicle, and Type 2 which is exposed to significant chipping. Type 2 includes significant surfaces of plated plastic parts attached to forward-facing vehicle areas or to vehicle areas subject to self-generated stone chipping (as defined by ≥ 15 degree impingement of straight line projection from tire). If no type is listed on detail drawing, Type 2 is assumed. Type 3 is a Very Severe Service specific to wheel clads and caps.

For MATSPC and Approved Paint on Plastics Systems (APOPS) Trim transmittal approval, as a new supplier of a given finish to GM, all testing shall be performed in an accredited laboratory. Laboratory accreditations to ISO/IEC 17025 are acceptable. If another laboratory is planned to be used that is not ISO/IEC 17025 approved, it is the responsibility of the supplier submitting the technology to receive approval to use the laboratory, from the GM Engineer who is responsible for approving the specific technology, before any testing. Using a non accredited lab may also require testing in two different labs, whereby one lab must be independent. Generally, the unaccredited laboratory must be in a facility that has a Quality System approval to ISO/TS 16949. For Part Production Approval Process (PPAP) Testing, tests performed outside of GM are to use a lab from an organization that is either third party registered to ISO/TS 16949 or has laboratory accreditations to ISO/IEC 17025. Include a scope of accreditation or a scope of activity from the auditor with the test data.

Symbols. Not applicable.

Typical Applications. This type of finish shall be principally used for decorative purpose. Bright and other (e.g., satin, brushed, dark, or grained) appearances for interior and exterior plastic applications, as defined by styling and specific appearance standards.