GMW GMW14668 PDF

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

Material Description. This standard is intended for the following applications: 

Interior (Code A). Interior applications do not require the use of discontinuous chromium or multiple layer nickel systems. For interior applications non-discontinuous chrome (r) is permissible. 

Type 1: Standard interior usage. 

Type 2: Applications where higher coating thicknesses are required and/or performance requirements are not met with Type 1 (e.g., door handles, manual shifter decor rings, or bezels, may require Type 2). This must be indicated on the part drawing including the required thickness. 

Type 3: Small parts such as radio control knob bezels. These parts do not require full plating approval per GMW16193, but only require demonstration of plating performance per this specification at Production Part Approval Process (PPAP). Refer to Appendix B, Figure B3, for geometry limitations.

Note: If no interior type is listed on the detail drawing, Type 1 is assumed. 

Exterior (Code B). For exterior applications, discontinuous chromium plate, microporous (mp) or microcracking (mc), in addition to a multiple layer nickel system, shall be used.

Type 1: No stone chipping exposure on a vehicle. 

Type 2: With stone chipping exposure on a vehicle. 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 impingement of straight line projection from tire). 

Type 3: High corrosion service conditions (wheel claddings and caps); includes stone chipping. 

Type 4: High corrosion calcium chloride resistant (Russian mud) chromium.

Note: If no exterior type is listed on the detail drawing, Type 2 is assumed. 1

Symbols. Not applicable. 

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