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ASTM D3288/D3288M-20

(Test Method)

Standard Test Methods for Magnet-Wire Enamels

Standard Test Methods for Magnet-Wire Enamels

SIGNIFICANCE AND USE
4.1 These tests are useful for specification and control purposes during the manufacture, purchase, and use of the magnet-wire enamels, and for determining uniformity of batches.
SCOPE
1.1 These test methods cover testing liquid enamel coatings used to produce film-insulated magnet wire.  
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 are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined  
1.3 The test methods appear as follows:    
Sections  
Density  
6 – 10  
Determined Solids  
16 – 22  
Effective Solids  
31 – 37  
Flash Point  
11 – 15  
Infrared Analysis  
45 – 50  
Stack Loss  
23 – 30  
Viscosity  
38 – 44  
1.4 There is no known IEC equivalent document.  
1.5 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.  
1.6 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
Published
Publication Date
31-Jul-2020
ICS
25.220.50 - Enamels
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Drafting Committee
D09.12 - Electrical Tests
Current Stage
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Standards Content (Sample)

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.
Designation: D3288/D3288M − 20
Standard Test Methods for
1
Magnet-Wire Enamels
This standard is issued under the fixed designation D3288/D3288M; 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* D29 Test Methods for Sampling and Testing Lac Resins
3
(Withdrawn 2005)
1.1 These test methods cover testing liquid enamel coatings
D56 Test Method for Flash Point by Tag Closed Cup Tester
used to produce film-insulated magnet wire.
D476 Classification for Dry Pigmentary Titanium Dioxide
1.2 The values stated in either SI units or inch-pound units
Products
are to be regarded separately as standard. The values stated in
D1298 Test Method for Density, Relative Density, or API
each system are not necessarily exact equivalents; therefore, to
Gravity of Crude Petroleum and Liquid Petroleum Prod-
ensure conformance with the standard, each system shall be
ucts by Hydrometer Method
used independently of the other, and values from the two
D1475 Test Method for Density of Liquid Coatings, Inks,
systems shall not be combined
and Related Products
D1711 Terminology Relating to Electrical Insulation
1.3 The test methods appear as follows:
D5423 Specification for Forced-Convection Laboratory Ov-
Sections
ens for Evaluation of Electrical Insulation
Density 6–10
Determined Solids 16–22 E131 Terminology Relating to Molecular Spectroscopy
Effective Solids 31–37
E168 Practices for General Techniques of Infrared Quanti-
Flash Point 11–15
tative Analysis
Infrared Analysis 45–50
Stack Loss 23–30
E691 Practice for Conducting an Interlaboratory Study to
Viscosity 38–44
Determine the Precision of a Test Method
1.4 There is no known IEC equivalent document.
E2975 Test Method for Calibration or Calibration Verifica-
tion of Concentric Cylinder Rotational Viscometers
1.5 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
3. Terminology
responsibility of the user of this standard to establish appro-
3.1 Definitions:
priate safety, health, and environmental practices and deter-
3.1.1 For definitions of terms used in these test methods,
mine the applicability of regulatory limitations prior to use.
refer to Terminology D1711.
1.6 This international standard was developed in accor-
3.2 Definitions of Terms Specific to This Standard:
dance with internationally recognized principles on standard-
3.2.1 For definitions of terms specific to this standard, see
ization established in the Decision on Principles for the
the individual test methods.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
4. Significance and Use
Barriers to Trade (TBT) Committee.
4.1 These tests are useful for specification and control
purposes during the manufacture, purchase, and use of the
2. Referenced Documents
magnet-wire enamels, and for determining uniformity of
2
2.1 ASTM Standards:
batches.
5. Sampling
1
5.1 Take a representative sample of liquid enamel and store
These test methods are under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and are the direct responsibility of
for future testing. Store the sample at room temperature in a
Subcommittee D09.12 on Electrical Tests.
tightly sealed, nearly full container, unless otherwise specified.
Current edition approved Aug. 1, 2020. Published September 2020. Originally
Use a container that is inert and impermeable to the wire
approved in 1973. Last previous edition approved in 2015 as D3288/D3288M – 15.
DOI: 10.1520/D3288_D3288M-20. enamel.These precautions avoid either the escape of solvent or
2
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
3
Standards volume information, refer to the standard’s Document Summary page on The last approved version of this historical standard is referenced on
the ASTM website. www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3288/D3288M − 20
reaction with the container and atmosphere. Glass and some 14. Procedure
metals are suitable materials. Copper, iron, and aluminum are
14.1 Determine the flash point in accordance with Test
unsatisfactory. After removing test sp
...

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: D3288/D3288M − 15 D3288/D3288M − 20
Standard Test Methods for
1
Magnet-Wire Enamels
This standard is issued under the fixed designation D3288/D3288M; 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 These test methods cover testing liquid enamel coatings used to produce film-insulated magnet wire.
1.2 The values stated in either lbs/gal or SI units or inch-pound units are to be regarded separately as standard. The values stated
in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined
1.3 The test methods appear as follows:
Sections
Density 6 – 10
Determined Solids 16 – 22
Effective Solids 31 – 37
Flash Point 11 – 15
Infrared Analysis 45 – 50
Stack Loss 23 – 30
Viscosity 38 – 44
1.4 There is no known IEC equivalent document.
1.5 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.
1.6 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:
3
D29 Test Methods for Sampling and Testing Lac Resins (Withdrawn 2005)
D56 Test Method for Flash Point by Tag Closed Cup Tester
D476 Classification for Dry Pigmentary Titanium Dioxide Products
1
These test methods are under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and are the direct responsibility of Subcommittee
D09.12 on Electrical Tests.
Current edition approved Nov. 1, 2015Aug. 1, 2020. Published November 2015September 2020. Originally approved in 1973. Last previous edition approved in 20082015
as D3288 – 08.D3288/D3288M – 15. DOI: 10.1520/D3288_D3288M-15.10.1520/D3288_D3288M-20.
2
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.
3
The last approved version of this historical standard is referenced on www.astm.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D3288/D3288M − 20
D1298 Test Method for Density, Relative Density, or API Gravity of Crude Petroleum and Liquid Petroleum Products by
Hydrometer Method
D1475 Test Method for Density of Liquid Coatings, Inks, and Related Products
D1711 Terminology Relating to Electrical Insulation
D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation
E131 Terminology Relating to Molecular Spectroscopy
E168 Practices for General Techniques of Infrared Quantitative Analysis
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
E2975 Test Method for Calibration or Calibration Verification of Concentric Cylinder Rotational Viscometers
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in these test methods, refer to Terminology D1711.
3.1 Definitions:
3.1.1 For definitions of terms used in these test methods, refer to Terminology D1711.
3.2 Definitions of terms specific to this standard:
3.2.1 For definitions of terms specific to this standard, see the individual test methods.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 For definitions of terms specific to this standard, see the individual test methods.
4. Significance and Use
4.1 These tests are useful for specification and control purposes during the manufacture, purchase, and use of the magnet-wire
enamels, and for determining uniformity of batches.
5. Sampling
5.1 Take a representative sample of liquid enamel and store for future
...

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SIGNIFICANCE AND USE
4.1 The widespread use of glassed-steel equipment in highly corrosive chemical processes has made it necessary to detect weak spots in the coating and repair them before catastrophic failure occurs in service. This test is intended to detect discontinuities and thin areas in a glass coating on metal to ensure that the coating is defect free and has sufficient thickness to withstand the prescribed service conditions. A test voltage may be selected at any desired value up to 20k V, thus making the test applicable to a wide range of thickness requirements. When, because of bubbles or defects, the thickness of glass at any spot is less than enough to withstand the applied voltage, a puncture results with an accompanying indication of a defect. Remedial action is then required to repair the defect before the equipment can be used for corrosive service. (When such defects are found before the equipment leaves the manufacturer's plant another application of glass can usually be applied and fired to become an integral part of the coating.)
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ABSTRACT
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SCOPE
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SCOPE
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SCOPE
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SCOPE
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