ASTM A976-03(2008)

    Standard Classification of Insulating Coatings by Composition, Relative Insulating Ability and Application

    SUPERSEDED (see Active link, below)


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    1. Scope

    1.1 This document classifies insulating coatings for electrical steels according to their composition, relative insulating ability, and functionality. The purpose of this classification is to assist users of insulating coatings by providing general information about the chemical nature and use of the coatings, as well as to provide important data concerning limits to their use, that is, relative insulating ability, punchability, temperature stability, weldability, and fabricability. Specific surface insulation resistivity values for each coating are not included in this classification. The user is referred to the flat-rolled electrical steel specifications noted in 1.2 should more detailed information concerning surface insulation resistivity values be required.

    1.2 This classification is to be used in conjunction with the various specifications for flat-rolled electrical steels under the jurisdiction of Committee A06, including Specifications A 345, A 677, A 683, A 726, A 840, and A 876. However, in those instances in which the coating descriptions and characteristics differ between this classification and any of the specifications, this classification shall supersede the specification.

    1.3 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.

    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A340 Terminology of Symbols and Definitions Relating to Magnetic Testing

    A345 Specification for Flat-Rolled Electrical Steels for Magnetic Applications

    A677 Specification for Nonoriented Electrical Steel Fully Processed Types

    A683 Specification for Nonoriented Electrical Steel, Semiprocessed Types

    A717/A717M Test Method for Surface Insulation Resistivity of Single-Strip Specimens

    A726 Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types

    A840 Specification for Fully Processed Magnetic Lamination Steel

    A876 Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types

    A937/A937M Test Method for Determining Interlaminar Resistance of Insulating Coatings Using Two Adjacent Test Surfaces


    ICS Code

    ICS Number Code 01.040.25 (Manufacturing engineering (Vocabularies)); 25.220.01 (Surface treatment and coating in general)

    UNSPSC Code

    UNSPSC Code 31380000(Magnets and magnetic materials)


    DOI: 10.1520/A0976-03R08

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