Parts of GB/T 19264 specify the definition, classification and general requirements to be met of pressboard and thin paperboard for electrical purposes. This section applies to electrical pressboard and thin cardboard.
GB/T 19264.1-2011 Referenced Document
IEC 60641-3 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
GB/T 19264.1-2011 history
2011GB/T 19264.1-2011 Pressboard and presspaper for electrical purposes.Part 1:Definitions and general requirements