ASTM A717/A717M-12(2018)

Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens

SIGNIFICANCE AND USE
5.1 This test method is particularly suitable for quality control in the application of insulating coatings.  
5.2 Surface insulation resistivity is evaluated from a dc current that can range from 0 (perfect insulator) to 1 A (perfect conductor).  
5.3 Single readings should not be considered significant since the nature of the test device and specimen are such that successive measurements of a specimen often yield different values.
SCOPE
1.1 This test method covers a means of testing the surface insulation resistivity of single strips or punchings of flat-rolled electrical steel under predetermined conditions of voltage, pressure, and temperature.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Historical
• Publication Date: 30-Apr-2018
• ICS: 29.035.20 - Plastics and rubber insulating materials
• Technical Committee: A06 - Magnetic Properties
• Drafting Committee: A06.01 - Test Methods

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A717/A717M − 12 (Reapproved 2018)
Standard Test Method for
1
Surface Insulation Resistivity of Single-Strip Specimens
This standard is issued under the fixed designationA717/A717M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope specimen.Itisnotthesameasthetermsinterlaminarresistivity
and stack resistivity, which refer to the average resistivity of
1.1 This test method covers a means of testing the surface
two adjacent insulative surfaces in contact with each other.
insulation resistivity of single strips or punchings of flat-rolled
electrical steel under predetermined conditions of voltage,
3.1.2 The apparatus is popularly known as a Franklin tester.
pressure, and temperature.
1.2 The values stated in either SI units or inch-pound units 4. Summary of Test Method
are to be regarded separately as standard. The values stated in
4.1 Ten metallic contacts of fixed area are applied to one of
each system may not be exact equivalents; therefore, each
thesurfacesofthespecimenandelectricalcontactismadewith
system shall be used independently of the other. Combining
the base metal by two drills. The effectiveness of the surface
values from the two systems may result in non-conformance
insulation is then indicated by a measurement of average
with the standard.
electrical current flowing between the contacts and the base
1.3 This standard does not purport to address all of the
metal under specified applied voltage. This measurement can
safety concerns, if any, associated with its use. It is the
be used directly as an indicator of insulation quality or may be
responsibility of the user of this standard to establish appro-
converted to an apparent surface insulation resistivity value.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
5. Significance and Use
1.4 This international standard was developed in accor-
5.1 This test method is particularly suitable for quality
dance with internationally recognized principles on standard-
control in the application of insulating coatings.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5.2 Surface insulation resistivity is evaluated from a dc
mendations issued by the World Trade Organization Technical
current that can range from 0 (perfect insulator) to 1A(perfect
Barriers to Trade (TBT) Committee.
conductor).
2. Referenced Documents
5.3 Single readings should not be considered significant
2
since the nature of the test device and specimen are such that
2.1 ASTM Standards:
successive measurements of a specimen often yield different
A34/A34M Practice for Sampling and Procurement Testing
values.
of Magnetic Materials
3. Terminology
6. Apparatus
3.1 Definitions of Terms Specific to This Standard:
6.1 The apparatus, as shown in Fig. 1 and Fig. 2, shall
3.1.1 surface insulation resistivity—refers to the effective
consist of a contact unit or test head which is attached to the
resistivity of a single insulative layer tested between applied
head of a hydraulic press. Its associated measuring equipment,
bare metal contacts and the base metal of the insulated test
which may be remotely located, includes an ammeter,
voltmeter, and voltage regulated dc power supply. When
measurements are to be made at elevated temperatures, the
1
This test method is under the jurisdiction of ASTM Committee A06 on
platen beneath the specimen is heated and controlled. Detailed
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
descriptions of the various components are given in AnnexA1.
Methods.
Current edition approved May 1, 2018. Published June 2018. Originally
approved in 1975. Last previous edition approved in 2012 as A717/A717M – 12.
7. Sampling
DOI: 10.1520/A0717_A0717M-12R18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.1 Samples shall be representative of the steel and shall be
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
cut in a manner to assure representative sampling as described
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in Practice A34/A34M.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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A717/A717M − 12 (2018)
FIG. 1 Apparatus of Surface Insulation Resistivity Measurement
9.4 The recommended standard test temperatures are room
temperature and 300°F [150°C]. Other temperat
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A717/A717M − 12 A717/A717M − 12 (Reapproved 2018)
Standard Test Method for
1
Surface Insulation Resistivity of Single-Strip Specimens
This standard is issued under the fixed designation A717/A717M; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This test method covers a means of testing the surface insulation resistivity of single strips or punchings of flat-rolled
electrical steel under predetermined conditions of voltage, pressure, and temperature.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.3 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2
2.1 ASTM Standards:
A34/A34M Practice for Sampling and Procurement Testing of Magnetic Materials
3. Terminology
3.1 Definitions of Terms Specific to This Standard:
3.1.1 surface insulation resistivity—refers to the effective resistivity of a single insulative layer tested between applied bare
metal contacts and the base metal of the insulated test specimen. It is not the same as the terms interlaminar resistivity and stack
resistivity, which refer to the average resistivity of two adjacent insulative surfaces in contact with each other.
3.1.2 The apparatus is popularly known as a Franklin tester.
4. Summary of Test Method
4.1 Ten metallic contacts of fixed area are applied to one of the surfaces of the specimen and electrical contact is made with
the base metal by two drills. The effectiveness of the surface insulation is then indicated by a measurement of average electrical
current flowing between the contacts and the base metal under specified applied voltage. This measurement can be used directly
as an indicator of insulation quality or may be converted to an apparent surface insulation resistivity value.
5. Significance and Use
5.1 This test method is particularly suitable for quality control in the application of insulating coatings.
5.2 Surface insulation resistivity is evaluated from a dc current that can range from 0 (perfect insulator) to 1 A (perfect
conductor).
5.3 Single readings should not be considered significant since the nature of the test device and specimen are such that successive
measurements of a specimen often yield different values.
1
This test method is under the jurisdiction of ASTM Committee A06 on Magnetic Properties and is the direct responsibility of Subcommittee A06.01 on Test Methods.
Current edition approved May 1, 2012May 1, 2018. Published July 2012June 2018. Originally approved in 1975. Last previous edition approved in 20062012 as
A717/A717MA717/A717M – 12. –06. DOI: 10.1520/A0717_A0717M-12.10.1520/A0717_A0717M-12R18.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A717/A717M − 12 (2018)
6. Apparatus
6.1 The apparatus, as shown in Fig. 1 and Fig. 2, shall consist of a contact unit or test head which is attached to the head of
a hydraulic press. Its associated measuring equipment, which may be remotely located, includes an ammeter, voltmeter, and
voltage regulated dc power supply. When measurements are to be made at elevated temperatures, the platen beneath the specimen
is heated and controlled
...