指定尺寸和机械性能，并给出测试方法。规定的机械性能包括抗拉强度、伸长率和抗弯曲和扭转损伤能力。未覆盖表面光洁度。

Specifies the dimensions and mechanical properties and gives test methods. The mechanical properties specified are tensile strength, elongation, and resistance to damage in bending and in torsion. Surface finish is not covered.