GB/T 19264.3-2003
Specification for pressboard and presspaper for electrical purposes Part 3: Specifications for individual materials--Sheet 1: Requirements for pressboard,type B.0.1,B.2.1,B.2.3,B.3.1,B.3.3,B.4.1,B.4.3,B.5.1,B.6.1 and B.7.1 (English Version)