GMNA GM7400M PDF

This standard provides a system for specifying significant properties of commonly used plastics, including unpigmented and pigmented, unfilled and filled products. It is intended to apply to parts (not resins) primarily as used in the automotive and related industries. It is also intended to be used either as the sole descriptor of a material or within the body of a specification covering the common standard characteristics required wherein additional specialized requirements are detailed.

Material Description. It is based on the principle that plastics should be described, insofar as is possible, in terms of specific performance characteristics desired in the molded part and that an infinite number of such descriptions can be formulated by the use of one or more standard statements (based on standard tests) each designating a quality level of a property or characteristic. Thus, users of plastic parts can, by selecting different combinations of performance characteristics, specify different combinations of properties desired in various parts.

Material Identification.

Marking Of Parts. Parts shall be marked using the latest version of ISO 11469. For example, polycarbonate would be indicated as follows:

> PC