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ASTM A717/A717M-06

(Test Method)

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

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

SIGNIFICANCE AND USE
This test method is particularly suitable for quality control in the application of insulating coatings.
Surface insulation resistivity is evaluated from a dc current that can range from 0 (perfect insulator) to 1 A (perfect conductor).  
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.
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.

General Information

Status
Historical
Publication Date
30-Apr-2006
ICS
29.035.20 - Plastics and rubber insulating materials
Technical Committee
A06 - Magnetic Properties
Drafting Committee
A06.01 - Test Methods
Current Stage
Ref Project

Relations

Replaces
ASTM A717/A717M-01 - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
Effective Date
01-May-2006
Replaced By
ASTM A717/A717M-12 - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
Effective Date
01-May-2012
Referred By
ASTM A1086-20 - Standard Specification for Thin-Gauge Nonoriented Electrical Steel Fully Processed Types
Effective Date
01-May-2006
Referred By
ASTM A976-18 - Standard Classification of Insulating Coatings for Electrical Steels by Composition, Relative Insulating Ability and Application
Effective Date
01-May-2006
Referred By
ASTM A726-18 - Standard Specification for Cold-Rolled Magnetic Lamination Quality Steel, Semiprocessed Types
Effective Date
01-May-2006
Referred By
ASTM A345-19 - Standard Specification for Flat-Rolled Electrical Steels for Magnetic Applications
Effective Date
01-May-2006
Referred By
ASTM A937/A937M-12(2019) - Standard Test Method for Determining Interlaminar Resistance of Insulating Coatings Using Two Adjacent Test Surfaces
Effective Date
01-May-2006
Referred By
ASTM A876-17e1 - Standard Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types
Effective Date
01-May-2006
Referred By
ASTM A677-16 - Standard Specification for Nonoriented Electrical Steel Fully Processed Types
Effective Date
01-May-2006

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ASTM A717/A717M-06 - Standard Test Method for Surface Insulation Resistivity of Single-Strip SpecimensASTM A717/A717M-06 - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
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ASTM A717/A717M-06 - Standard Test Method for Surface Insulation Resistivity of Single-Strip Specimens
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Standards Content (Sample)

Designation: A717/A717M − 06
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 4. Summary of Test Method
1.1 This test method covers a means of testing the surface 4.1 Ten metallic contacts of fixed area are applied to one of
insulation resistivity of single strips or punchings of flat-rolled thesurfacesofthespecimenandelectricalcontactismadewith
the base metal by two drills. The effectiveness of the surface
electrical steel under predetermined conditions of voltage,
pressure, and temperature. insulation is then indicated by a measurement of average
electrical current flowing between the contacts and the base
1.2 The values stated in either SI units or inch-pound units
metal under specified applied voltage. This measurement can
are to be regarded separately as standard. The values stated in
be used directly as an indicator of insulation quality or may be
each system may not be exact equivalents; therefore, each
converted to an apparent surface insulation resistivity value.
system shall be used independently of the other. Combining
values from the two systems may result in non-conformance
5. Significance and Use
with the standard.
5.1 This test method is particularly suitable for quality
1.3 This standard does not purport to address all of the
control in the application of insulating coatings.
safety concerns, if any, associated with its use. It is the
5.2 Surface insulation resistivity is evaluated from a dc
responsibility of the user of this standard to establish appro-
current that can range from 0 (perfect insulator) to 1A(perfect
priate safety and health practices and determine the applica-
conductor).
bility of regulatory limitations prior to use.
5.3 Single readings should not be considered significant
2. Referenced Documents
since the nature of the test device and specimen are such that
2
successive measurements of a specimen often yield different
2.1 ASTM Standards:
values.
A34/A34M Practice for Sampling and Procurement Testing
of Magnetic Materials
6. Apparatus
3. Terminology 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
3.1 Definitions of Terms Specific to This Standard:
head of a hydraulic press. Its associated measuring equipment,
3.1.1 The term surface insulation resistivity used in this
which may be remotely located, includes an ammeter, voltme-
method refers to the effective resistivity of a single insulative
ter, and voltage regulated dc power supply. When measure-
layer tested between applied bare metal contacts and the base
ments are to be made at elevated temperatures, the platen
metal of the insulated test specimen. It is not the same as the
beneath the specimen is heated and controlled. Detailed de-
terms interlaminar resistivity and stack resistivity, which refer
scriptions of the various components are given in Annex A1.
to the average resistivity of two adjacent insulative surfaces in
contact with each other.
7. Sampling
3.2 The apparatus is popularly known as a Franklin tester.
7.1 Samples shall be representative of the steel and shall be
cut in a manner to assure representative sampling as described
in Practice A34/A34M.
1
This test method is under the jurisdiction of ASTM Committee A06 on
MagneticPropertiesandisthedirectresponsibilityofSubcommitteeA06.01onTest
8. Test Specimen
Methods.
Current edition approved May 1, 2006. Published May 2006. Originally
8.1 Thewidthandlengthofaspecimenstripshallbegreater
approved in 1975. Last previous edition approved in 2001 as A717/A717M – 01.
than the width and length respectively of the assembly of
DOI: 10.1520/A0717_A0717M-06.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contacts. The suggested minimum specimen size is 2 by 5 in.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
[50 by 130 mm].
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 8.2 A minimum of five specimen strips is recommended.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
A717/A717M − 06
FIG. 1 Apparatus of Surface Insulation Resistivity Measurement
9.6 When the insulation may be hygroscopic, a conditioning
procedure immediately prior to testing should be mutually
agreed upon by the producer and the user.
9.7 Place the specimen on the platen beneath the test head
and position it so that all contacts are within the test area when
the test head is brought in contact with the specime
...

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X1.3 Significance and Use
X1.3.1 Tests made on a cellular plastic under conditions herein prescribed can be of considerable value in comparing the rate of burning and/or extent and time of burning of different materials, in controlling manufacturing processes, or as a measure of deterioration or change in burning characteristics prior to or during use.
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