This SAE Recommended Practice provides test methods and requirements to evaluate the suitability of plastic materials intended for optical applications in motor vehicles. The tests are intended to determine physical and optical characteristics of the material only. Performance expectations of finished assemblies, including plastic components, are to be based on tests for lighting devices, as specified in SAE Standards and Recommended Practices for motor vehicle lighting equipment. Field experience has shown that plastic materials meeting the requirements of this document and molded in accordance with good molding practices will produce durable lighting devices.
The changes provide for the use of controlled forward light scattering plastic materials, herein referred to as Diffusing Plastic Materials. Diffusing Plastic Materials can not be evaluated for durability using the conventional "increase of haze" methodology since measurement of haze as diffusing materials are not within the scope of ASTM D 1003. This new evaluation methodology is limited to Diffusing Plastic Materials only and requires a more stringent maintenance of luminous transmittance. All other existing testing and requirements remain unchanged for all materials. No changes have been made or allowed in the 2009 revision for transparent plastic materials. New definitions have been incorporated as necessary.