ASTM D2457-08 Standard Test Method for Specular Gloss of Plastic Films and Solid Plastics
ASTM D2457-08 塑料薄膜和固体塑料镜面光泽的标准测试方法
Scope：
1.1 This test method describes procedures for the measurement of gloss of plastic films and solid plastics, both opaque and transparent. It contains four separate gloss angles (Note 1):
1.1.1 60-deg, recommended for intermediate-gloss films,
1.1.2 20-deg, recommended for high-gloss films,
1.1.3 45-deg, recommended for intermediate and low-gloss films,
1.1.4 85-deg, recommended for intermediate and low gloss films, and
1.1.5 75-deg, recommended for plastic siding and soffit.