Standard Specification for
Pressboard for Electrical Insulating Purposes1
This standard is issued under the fixed designation D 4063; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 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.
1.2 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.
1.3 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.
1.4 The maximum thickness available will differ with the
type and the manufacturer. The maximum sheet size will differ
with the thickness, type, and manufacturer.
1.5 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.
2. Referenced Documents
2.1 ASTM Standards:
D 1305 Specification for Electrical Insulating Paper and
Paperboard—Sulfate (Kraft) Layer Type2
D 1711 Terminology Relating to Electrical Insulation2
D 3394 Test Methods for Sampling and Testing Electrical
Insulating Board3
2.2 IEC Standards-Publication:
641-3, Specification for Pressboard and Presspaper for Electrical Purposes–Part 34
3. Terminology
3.1 Definitions:
Click below to download Astm D 4063 – 99 pdf free
[wpdm_package id=’27085′]
Click here to download Astm D 4062 – 99 (Reapproved 2003) Pdf Free Download