General Motors Company

Authentic Decorative Interior Trim Materials - Issue 1; English
 N GMW17538

Annotation

This specification is a raw material and component performance specification that covers the requirements for decorative authentic trim such as real wood trim and carbon fiber trim, as well as components made of decorative authentic materials. These materials are limited to areas where low levels of ultraviolet radiation and lower interior temperatures are experienced. This is based upon current chemistry limitations. The material used shall be processed to produce components of a quality such that all requirements of this specification are met.

Material Description. These materials are multilayer constructions where the decorative layer is protected with a topcoat and manufactured to a substrate. Some parts manufactured from these materials may require an aluminum, fiberglass, thermoplastic or approved equivalent layer incorporated into the lamination or as a substrate. This may help a formed part retain its shape, act as an anchor for metal mounting studs, or aid in the prevention of warpage or splintering upon impact. The bond between these layers must remain intact in all of the tests, and each unique composite shall be tested to the part construction portions of the specification.

The finish shall be a wear and soil resistant polyester, polyurethane, acrylic, or approved equivalent. The back and non-visible edges shall be sealed in a manner that will effectively prevent moisture absorption.

Certain applications such as post applied veneers, may require the use of a pressure sensitive adhesive on the side opposite the decorative veneer. If an adhesive is required, the adhesive must be uniform across the surface to which it is applied and shall be pressure sensitive over a temperature range of 0 °C to 55 °C. To protect the adhesive and facilitate handling, the adhesive mass shall be covered with a release liner which can be readily removed when the material is to be applied. The liner must adhere to the part during shipping and storage but must separate cleanly without loosening or removing adhesive.