ASTM A976-03
(Classification)Standard Classification of Insulating Coatings by Composition, Relative Insulating Ability and Application
Standard Classification of Insulating Coatings by Composition, Relative Insulating Ability and Application
SIGNIFICANCE AND USE
This classification establishes categories of insulating coatings based on their chemical nature, relative insulating ability, and typical applications. These categories describe general physical and chemical characteristics of the coatings that are useful in making broad estimates of their insulating ability and suitability for various applications.
FIG. 1 Apparatus of Surface Insulation Resistivity Measurement for Franklin Test
FIG. 2 Diagram of Connections for Contacts and Resistors for Franklin Test
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 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.
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Designation: A 976 – 03
Standard Classification of
Insulating Coatings for Electrical Steels by Composition,
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Relative Insulating Ability and Application
This standard is issued under the fixed designation A 976; 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 A 345 Specification for Flat-Rolled Electrical Steels for
Magnetic Applications
1.1 This document classifies insulating coatings for electri-
A 677 Specification for Nonoriented Electrical Steel Fully
cal steels according to their composition, relative insulating
Processed Types
ability,andfunctionality.Thepurposeofthisclassificationisto
A 683 Specification for Nonoriented Electrical Steel, Semi-
assist users of insulating coatings by providing general infor-
processed Types
mation about the chemical nature and use of the coatings, as
A 717/A 717M Test Method for Surface Insulation Resis-
well as to provide important data concerning limits to their use,
tivity of Single Strip Specimens
that is, relative insulating ability, punchability, temperature
A 726 Specification for Cold Rolled Magnetic Lamination
stability, weldability, and fabricability. Specific surface insula-
Quality Steel, Semiprocessed Types
tion resistivity values for each coating are not included in this
A 840 Specification for Fully Processed Magnetic Lamina-
classification. The user is referred to the flat-rolled electrical
tion Steel
steel specifications noted in 1.2 should more detailed informa-
A 876 Specification for Flat Rolled, Grain Oriented, Sili-
tion concerning surface insulation resistivity values be re-
con Iron, Electrical Steel, Fully Processed Types
quired.
A 937/A 937M Test Method for Determining Interlaminar
1.2 This classification is to be used in conjunction with the
Resistance of Insulating Coatings Using Two Adjacent
various specifications for flat-rolled electrical steels under the
Test Surfaces
jurisdictionofCommitteeA06,includingSpecificationsA 345,
A 677, A 683, A 726, A 840, and A 876. However, in those
3. Terminology
instances in which the coating descriptions and characteristics
3.1 Definitions of Terms Specific to This Standard:
differ between this classification and any of the specifications,
3.1.1 interlaminar resistance, n—the average resistance of
this classification shall supersede the specification.
two adjacent insulating surfaces in contact with each other, in
1.3 The values stated in customary (cgs-emu and inch-
accordance with Test Method A 937/A 937M.
pound) units are to be regarded as standard. The values given
3.1.2 stress-relief anneal, n—heat treatment that improves
in parentheses are mathematical conversions to SI units which
the magnetic properties of electrical steel by relieving internal
are provided for information only and are not considered
stresses which are introduced during fabrication of magnetic
standard.
cores.
1.4 This standard does not purport to address all of the
3.1.3 surface insulation resistivity, n—the effective resistiv-
safety concerns, if any, associated with its use. It is the
ity of a single insulating layer tested between applied bare
responsibility of the user of this standard to establish appro-
metal contacts and the base metal of the insulated test
priate safety and health practices and determine the applica-
specimen, in accordance with Test Method A 717/A 717M.
bility of regulatory limitations prior to use.
4. Significance and Use
2. Referenced Documents
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4.1 This classification establishes categories of insulating
2.1 ASTM Standards:
coatings based on their chemical nature, relative insulating
ability, and typical applications. These categories describe
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This classification is under the jurisdiction of ASTM CommitteeA06 on
general physical and chemical characteristics of the coatings
Magnetic Properties and is the direct responsibility of Subcommittee A06.02 on
that are useful in making broad estimates of their insulating
Material Specifications.
ability and suitability for various applications.
Current edition approved Oct. 1, 2003. Published November 2003. Originally
published in 1997. Last previous edition approved in 1997 as A 976 – 97.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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A976–03
6. Test Methods
6.1 The surface insulation resistiv
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