Specification for pressboard and presspaper for electrical purposes - Part 3: Specifications for individual materials - Sheet 2: Requirements for presspaper, types P.2.1, P.4.1, P.4.2, P.4.3 and P.6.1 - Supplement 1: Comparison of the types
电气用纸板和纸张规范第3部分:单项材料规范活页2:P.2.1、P.4.1、P.4.2、P.4.3和P.6.1型纸张的要求补充1:类型比较