ASTM D3353-98

Standard Test Methods for Fibrous-Insulated Magnet Wire

SCOPE
1.1 These test methods cover the testing of fibrous-insulated electrical conductors, commonly referred to as magnet wire, which are used in electrical apparatus. The test methods are intended primarily for evaluation of the electrical insulating materials used. It is intended that these test methods be used, except where modified by individual specifications for particular applications.  
1.1.1 These test methods apply to those magnet wires that are fiber-covered and in which the conductor may or may not be coated with an underlying insulating film as covered by Test Methods D1676. Fiber-covered wires are produced by serving helically or wrapping fibers or fibrous-tape insulation uniformly around the wire in multiple layers. The served or wrapped materials may be bonded to the underlying wire.  
1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.  
1.3 The test methods appear in the following sections:  Procedure Section Adhesion and Flexibility 8 Dielectric Breakdown Voltage 9 Electrical Resistance of Conductors 5 Elongation 4 Fibrous Coverage 6 Measurement of Dimensions 7
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 . See 8.4.1 and 9.5.1 for specific caution statements.

General Information

• Status: Historical
• Publication Date: 09-May-1998
• ICS: 29.060.10 - Wires
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaced By: ASTM D3353-04 - Standard Test Methods for Fibrous-Insulated Magnet Wire
• Effective Date: 01-Apr-2004
• Referred By: ASTM D4881-05(2017) - Standard Test Method for Thermal Endurance of Varnished Fibrous- or Film-Wrapped Magnet Wire
• Effective Date: 10-May-1998
• Referred By: ASTM D1711-22 - Standard Terminology Relating to Electrical Insulation
• Effective Date: 10-May-1998

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
An American National Standard
Designation: D 3353 – 98
Standard Test Methods for
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Fibrous-Insulated Magnet Wire
This standard is issued under the fixed designation D 3353; 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 D 149 Test Method for Dielectric Breakdown Voltage and
Dielectric Strength of Solid Electrical Insulating Materials
1.1 These test methods cover the testing of fibrous-insulated
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at Commercial Power Frequencies
electrical conductors, commonly referred to as magnet wire,
3
D 1676 Test Method for Film-Insulated Magnet Wire
which are used in electrical apparatus. The test methods are
D 5423 Specification for Forced–Convection Laboratory
intended primarily for evaluation of the electrical insulating
4
Ovens for Evaluating Electrical Insulation
materials used. It is intended that these test methods be used,
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E 8 Test Methods for Tension Testing of Metallic Materials
except where modified by individual specifications for particu-
2.2 IEC Standard:
lar applications.
6
IEC 851 Methods of Test for Winding Wires
1.1.1 These test methods apply to those magnet wires that
are fiber-covered and in which the conductor may or may not
3. Terminology
be coated with an underlying insulating film as covered by Test
3.1 Definitions of Terms Specific to This Standard:
Methods D 1676. Fiber-covered wires are produced by serving
3.1.1 serving, n—a uniform wrapping of fibrous insulation
helically or wrapping fibers or fibrous-tape insulation uni-
around a magnet wire or bare conductor.
formly around the wire in single and multiple layers. The
served or wrapped materials may be bonded to the underlying
4. Elongation
wire.
4.1 Scope—This test method covers the determination of
1.2 The values stated in inch-pound units are the standard.
the elongation of fibrous insulated magnet wire that results in
The SI equivalents of inch-pound units may be approximate.
a fracture of the conductor.
1.3 The test methods appear in the following sections:
4.2 Significance and Use—The elongation determined by
Procedure Section
this test method provides a general measure of the ductility of
Adhesion and Flexibility 8
Dielectric Breakdown Voltage 9
the conductor and the effect of the processing to which it has
Electrical Resistance of Conductors 5
been subjected during the insulating operation.
Elongation 4
4.3 Apparatus—The equipment shall have a minimum sepa-
Fibrous Coverage 6
Measurement of Dimensions 7
ration of 10 in. (254 mm) between grips, and be capable of
elongating the specimen to its breaking point, at a constant rate
1.4 This standard does not purport to address all of the
of 12 6 1 in./min (305 6 25 mm/min). The equipment shall be
safety concerns, if any, associated with its use. It is the
such that the error of the length measurement will be 1 % or
responsibility of the user of this standard to establish appro-
less. Suitable, non-slip grips are required that will not damage
priate safety and health practices and determine the applica-
the specimen in the region of elongation. Drum or capstan type
bility of regulatory limitations prior to use.See 8.4.1 and 9.5.1
grips have been found to be unsatisfactory.
for specific caution statements.
1.5 This standard and IEC 851 are similar if not equivalent
NOTE 1—See Test Methods E 8 for a discussion of machines, gripping
in technical content.
devices, and rates of stressing.
4.4 Procedure:
2. Referenced Documents
4.4.1 Remove the fibrous insulation without distorting the
2.1 ASTM Standards:
conductor for wire sizes 0.0253 in. (0.6426 mm) (AWG 22)
B 193 Test Method for Resistivity of Electrical Conductor
and finer. The insulation need not be removed from sizes larger
2
Materials
than 0.0253 in.
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These test methods are under the jurisdiction of ASTM Committee D-9 on
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Electrical and Electronic Insulating Materials and are the direct responsibility of Annual Book of ASTM Standards, Vol 10.01.
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Subcommittee D09.10 on Magnet Wire Insulation. Annual Book of ASTM Standards, Vol 10.02.
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Current edition approved May 10, 1998. Published March 1999. Originally Annual Book of ASTM Standards, Vol 03.01.
e1 6
published as D 3353 – 74. Last previous edition D 3353 – 92 (1995) . Available from International Engineering Consortium, 549 West Randolph
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Annual Book of ASTM Standards, Vol 02.03. Street, Suite 600, Chicago IL 60661–2208.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D 3353
4.4.2 Standard Method: Insert the test specimen into the 5.3 Apparatus—The ty
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