ASTM D2519-01
(Test Method)Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
SCOPE
1.1 This test method covers determination of the bond strength of an electrical insulating varnish when applied to a helical coil. The helical coil can be made from bare aluminum or copper wire or from film or fiber-insulated magnet wire. Helical coils made from bare aluminum or bare copper wire will yield values of bond strength for the varnish when applied to bare metal conductors. The use of film or fiber-insulated magnet wire will show values for that particular combination of insulation and varnish.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 and health practices and determine the applicability of regulatory limitations prior to use. See Section 7.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
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An American National Standard
Designation: D 2519 – 01
Standard Test Method for
Bond Strength of Electrical Insulating Varnishes by the
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Helical Coil Test
This standard is issued under the fixed designation D 2519; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope physical or electrical stress and failure of the specimen under
test.
1.1 This test method covers determination of the bond
3.2.2 response time—the time required for an indicating or
strength of an electrical insulating varnish when applied to a
recording device to react to change in stress on a specimen
helical coil. The helical coil can be made from bare aluminum
under test.
or copper wire or from film or fiber-insulated magnet wire.
3.2.3 See Terminology D 1711 for definitions of other terms
Helical coils made from bare aluminum or bare copper wire
relating to electrical insulation.
will yield values of bond strength for the varnish when applied
to bare metal conductors. The use of film or fiber-insulated
4. Summary of Test Method
magnet wire will show values for that particular combination
4.1 Flexural strength tests are made on varnish-treated
of insulation and varnish.
helical coils to determine the force required to break the coil
1.2 The values stated in SI units are to be regarded as the
under specified conditions.
standard. The values given in parentheses are for information
only.
5. Significance and Use
1.3 This standard does not purport to address all of the
5.1 Values obtained by flexural tests can provide informa-
safety concerns, if any, associated with its use. It is the
tion with regard to the bond strength of the particular varnish,
responsibility of the user of this standard to establish appro-
in combination with a particular wire, when measured under
priate safety and health practices and determine the applica-
conditions described in this test method.
bility of regulatory limitations prior to use. See Section 7.
6. Apparatus
2. Referenced Documents
6.1 Tensile Testing Machine—An adjustable-speed drive
2.1 ASTM Standards:
and a suitable instrument for measuring force should be used in
D 115 Test Methods for Testing Solvent Containing Var-
2 breaking the specimen. This may be in the form of one of the
nishes Used for Electrical Insulation
2 generally available tensile testing machines, or may be simply
D 1711 Terminology Relating to Electrical Insulation
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an accurate spring gage and a separate adjustable-speed drive.
D 6054 Practice for Conditioning Electrical Insulating Ma-
3 To cover the range of load strength values which are commonly
terials for Testing
encountered it is recommended that a multirange tester be
3. Terminology used.
6.1.1 It has been found that gages rated 5, 25, 150, and
3.1 Definitions:
500 N (1, 5, 30, and 100 lbf) are adequate to cover the range of
3.1.1 bond strength—a measure of the force required to
varnishes.
separate surfaces which have been bonded together.
6.2 Test Fixture—The test fixture shall consist of two
3.2 Definitions of Terms Specific to This Standard:
rollers, attached to a common frame, and a 90° V-block. One
3.2.1 event time—the time between initial application of a
part, either the rollers or the V-block, is held stationary while
the other part is moved. There shall be no friction contact
which will affect this movement. The general shape and the
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This test method is under the jurisdiction of ASTM Committee D09 on relative position of these parts is shown in Fig. 1. The rollers
Electrical and Electronic Insulating Materials and is the direct responsibility of
shall have a diameter of 9.5 mm (0.375 in.) at the center and
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu-
lating Compounds.
Current edition approved Sept. 10, 2001. Published December 2001. Originally
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published as D 2519 – 66 T. Last previous edition D 2519 – 96. Spring gages from John Chattilon and Sons, 83-30 Kew Gardens Road, Kew
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Annual Book of ASTM Standards, Vol 10.01. Gardens, NY 11415 or from Hunter Spring Co., One Spring Avenue, Hatfield, PA
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Annual Book of ASTM Standards, Vol 10.02. 19440, or its equivalent, have been found satisfactory for this purpose.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
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