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 (IEC 60641-3-2:2007); German version EN 60641-3-2:2008
电气用纸板和纸.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型纸的要求(IEC 60641-3-2-2007);德文版EN 60641-3-2:2008