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ASTM D 4063 Document Information:
Title
Standard Specification for Pressboard for Electrical Insulating Purposes
ASTM International
Publication Date:
Nov 10, 1999
Scope:
This specification covers pressboard for electrical insulating
purposes, manufactured from kraft,
cotton, or kraft and cotton pulps. This board is intended for
dielectrical or structural purposes
in transformers and other electrical apparatus.
Electrical insulating boards are most commonly referred to (and will
be referred to herein) as
pressboard. Other terms used for pressboard include transformer board,
fuller board, and presspan.
This specification covers pressboard having a nominal thickness of
0.030 to 0.315 in. (0.8 to 8.0
mm). For thinner material refer to Specification D 1305.
The maximum thickness available will differ with the type and the
manufacturer. The maximum sheet
size will differ with the thickness, type, and manufacturer.
Pressboard shall normally be plied wet without pasting. Unless
specified by the purchaser, this
specification does not include pressboard comprised of two or more
sheets that have been laminated
together using an adhesive.
NOTE 1 - The materials described in this specification are similar to
corresponding types of
pressboard described in IEC Specification 641-3, Sheet 1, Types B.0.1,
B.2.1, B.2.3, B.3.1, and
B.3.3.
Keywords:
- ash
- board
- calendered
- chlorides
- compressibility
- cotton
- density
- dielectric strength
- kraft
- moisture
- precompressed
- pressboard
- shrinkage
- tensile strength
- thickness
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