Standard Historical Last Updated: Dec 31, 2010
ASTM D3955-04

Standard Specification for Electrical Insulating Varnishes

Abstract

This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process. The varnishes are classified according to grades: Grade DA; Grade DO; Grade DM; Grade DS; Grade DW; and Grade DT. This specification covers both flexible and rigid, solvent and solventless insulating varnishes. The insulating varnishes are classified according to thermal classes: Class 130; Class 155; Class 180; Class 200; and Class 220. Quality conformance tests shall be performed to conform to the specified requirements.

Scope

1.1 This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process.

1.2 Varnishes, flexible or rigid, included in this specification are:

Grade DA-Air-dry

Grade DO-Organic solvent containing, baking,

Grade DM-Reactive diluent containing,

Grade DS-Silicone,

Grade DW-Water containing, and

Grade DT-Thixotropic.

1.3 The values given in parentheses are for information only.

Note 1—This specification resembles IEC 60455 in title only. The content is significantly different.

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Details
Book of Standards Volume: 10.02
Developed by Subcommittee: D09.01
Pages: 4
DOI: 10.1520/D3955-04