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ASTM D3955-13

(Specification)

Standard Specification for Electrical Insulating Varnishes

Standard Specification for Electrical Insulating Varnishes

ABSTRACT
This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process. The varnishes are classified according to grades: Grade DA; Grade DO; Grade DM; Grade DS; Grade DW; and Grade DT. This specification covers both flexible and rigid, solvent and solventless insulating varnishes. The insulating varnishes are classified according to thermal classes: Class 130; Class 155; Class 180; Class 200; and Class 220. Quality conformance tests shall be performed to conform to the specified requirements.
SCOPE
1.1 This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process.  
1.2 Varnishes, flexible or rigid, included in this specification are:
Grade DA—Air-dry
Grade DO—Organic solvent containing, baking,
Grade DM—Reactive diluent containing,  
Grade DS—Silicone,
Grade DW—Water containing, and
Grade DT—Thixotropic.  
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.Note 1—This specification resembles IEC 60455 in title only. The content is significantly different.

General Information

Status
Historical
Publication Date
31-Mar-2013
ICS
29.035.60 - Varnished fabrics
Technical Committee
D09 - Electrical and Electronic Insulating Materials
Drafting Committee
D09.01 - Electrical Insulating Products
Current Stage
Ref Project

Relations

Replaces
ASTM D3955-04(2009) - Standard Specification for Electrical Insulating Varnishes
Effective Date
01-Apr-2013
Replaced By
ASTM D3955-20 - Standard Specification for Electrical Insulating Varnishes
Effective Date
01-Aug-2020

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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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:D3955 −13
Standard Specification for
1
Electrical Insulating Varnishes
This standard is issued under the fixed designation D3955; 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* D3251 Test Method for Thermal Endurance Characteristics
of Electrical Insulating Varnishes Applied Over Film-
1.1 This specification covers the tests and values for elec-
Insulated Magnet Wire
trical insulating varnishes, as supplied, which are suitable for
D3278 Test Methods for Flash Point of Liquids by Small
the impregnation and treatment of electrical coils and windings
Scale Closed-Cup Apparatus
applied by dip process.
D4733 Test Methods for Solventless Electrical Insulating
1.2 Varnishes, flexible or rigid, included in this specification
Varnishes
are:
D4880 Test Method for Salt Water Proofness of Insulating
Grade DA—Air-dry
Varnishes Over Enamelled Magnet Wire
Grade DO—Organic solvent containing, baking,
D5637 Test Method for Moisture Resistance of Electrical
Grade DM—Reactive diluent containing,
Insulating Varnishes
Grade DS—Silicone,
D5638 Test Method for Chemical Resistance of Electrical
Grade DW—Water containing, and
Insulating Varnishes
Grade DT—Thixotropic.
3
2.2 Military Specifications:
1.3 The values stated in inch-pound units are to be regarded
MIL-PRF-17672 Hydraulic Fluid, Petroleum, Inhibited
as standard. The values given in parentheses are mathematical
MIL-PRF-17331 Lubricating Oil, Synthetic Base P-D-680,
conversions to SI units that are provided for information only
Dry Cleaning Solvent
and are not considered standard.
MIL-D-16791 Detergent, General Purpose, (Liquid, Non-
Ionic)
NOTE 1—This specification resembles IEC 60455 in title only. The
3
content is significantly different.
2.3 Other Standards:
NEMA MW1000 Magnet Wire
2. Referenced Documents
IEC 60455 Resin Based Reactive Compounds Used for
2
2.1 ASTM Standards: Electrical Insulation
D93 Test Methods for Flash Point by Pensky-Martens
Closed Cup Tester 3. Terminology
D115 Test Methods for Testing Solvent Containing Var-
3.1 Definitions—For definitions of terms used in this speci-
nishes Used for Electrical Insulation
fication refer to Terminology D1711.
D1711 Terminology Relating to Electrical Insulation
D2519 Test Method for Bond Strength of Electrical Insulat-
4. Flexible or Rigid Classification
ing Varnishes by the Helical Coil Test
4.1 This specification covers both flexible and rigid, solvent
D3056 Test Method for Gel Time of Solventless Varnishes
(including water) and solventless insulating varnishes.
D3145 Test Method for Thermal Endurance of Electrical
Insulating Varnishes by the Helical Coil Method
5. Thermal Classification
5.1 The thermal classification of insulating varnishes cov-
1
ered by this specification is determined by using Test Methods
This specification is under the jurisdiction of ASTM Committee D09 on
Electrical and Electronic Insulating Materials and is the direct responsibility of
D3145 and D3251 in conjunction with 18 AWG magnet wire
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat-
conforming to MW 35-C and MW 16-C in accordance with
ing Compounds.
NEMA MW1000. Determine the temperature index at 20 000
Current edition approved April 1, 2013. Published April 2013. Originally
approved in 1980. Last previous edition approved in 2009 as D3955–04 (2009). h.
DOI: 10.1520/D3955-13.
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 Available from Global Engineering Documents, 15 Inverness Way, East
the ASTM website. Englewood, CO 80112-5704, http://www.global.ihs.com.
*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 ----------------------
D3955−13
5.2 The thermal class is determined from the temperature 7. Hazards
index range as follows:
7.1 It is unsafe to use varnish at temperatures above the
Thermal Class Temperature Index Range
flash point without adequate ventilation, especially if the
130 130.0 to 154.9
155 155.0 to 179.9 possibility exists that flames or sparks are present. Store
180 180.0 to 199.9
varnish in sealed containers.
200 200.0 to 219.9
220 220.0 and above
8. Sampling
6. General Specifications and Qualification Requirements
8.1 Obtain varnish samples and appropriate thinner either
6.1 All varnishes supplied under this specification must
fr
...

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: D3955 − 04 (Reapproved 2009) D3955 − 13 An American National Standard
Standard Specification for
1
Electrical Insulating Varnishes
This standard is issued under the fixed designation D3955; 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 Scope*
1.1 This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the
impregnation and treatment of electrical coils and windings applied by dip process.
1.2 Varnishes, flexible or rigid, included in this specification are:
Grade DA—Air-dry
Grade DO—Organic solvent containing, baking,
Grade DM—Reactive diluent containing,
Grade DS—Silicone,
Grade DW—Water containing, and
Grade DT—Thixotropic.
1.3 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
NOTE 1—This specification resembles IEC 60455 in title only. The content is significantly different.
2. Referenced Documents
2
2.1 ASTM Standards:
D93 Test Methods for Flash Point by Pensky-Martens Closed Cup Tester
D115 Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
D2519 Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
D3056 Test Method for Gel Time of Solventless Varnishes
D3145 Test Method for Thermal Endurance of Electrical Insulating Varnishes by the Helical Coil Method
D3251 Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated
Magnet Wire
D3278 Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus
D4733 Test Methods for Solventless Electrical Insulating Varnishes
D4880 Test Method for Salt Water Proofness of Insulating Varnishes Over Enamelled Magnet Wire
D5637 Test Method for Moisture Resistance of Electrical Insulating Varnishes
D5638 Test Method for Chemical Resistance of Electrical Insulating Varnishes
3
2.2 Military Specifications:
MIL-PRF-17672 Hydraulic Fluid, Petroleum, Inhibited
MIL-PRF-17331 Lubricating Oil, Synthetic Base P-D-680, Dry Cleaning Solvent
MIL-D-16791 Detergent, General Purpose, (Liquid, Non-Ionic)
3
2.3 Other Standards:
NEMA MW1000 Magnet Wire
IEC 60455 Resin Based Reactive Compounds Used for Electrical Insulation
1
This specification is under the jurisdiction of ASTM Committee D09 on Electrical and Electronic Insulating Materials and is the direct responsibility of Subcommittee
D09.01 on Electrical Insulating Varnishes, Powders and Encapsulating Compounds.
Current edition approved Oct. 1, 2009April 1, 2013. Published February 2010April 2013. Originally approved in 1980. Last previous edition approved in 20042009 as
D3955–04. –04 (2009). DOI: 10.1520/D3955-04R09.10.1520/D3955-13.
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
Available from Global Engineering Documents, 15 Inverness Way, East Englewood, CO 80112-5704, http://www.global.ihs.com.
*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 ----------------------
D3955 − 13
3. Terminology
3.1 Definitions—For definitions of terms used in this specification refer to Terminology D1711.
4. Flexible or Rigid Classification
4.1 This specification covers both flexible and rigid, solvent (including water) and solventless insulating varnishes.
5. Thermal Classification
5.1 The thermal classification of insulating varnishes covered by this specification is determined by using Test Methods D3145
and D3251 in conjunction with 18 AWG magnet wire conforming to MW 35-C and MW 16-C in accordance with NEMA
MW1000. Determine the temperature index at 20 000 h.
5.2 The thermal class is determined from the temperature index range as follows:
Thermal Class Temperature Index Range
130 130.0 to 154.9
155 155.0 to 179.9
180 180.0 to 199.9
200 200.0 to 219.9
220 220.0 and above
6. General S
...

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ASTM D3056-23(Test Method)
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SIGNIFICANCE AND USE
4.1 Gel time is important in determining batch uniformity and some processing characteristics. It is indicative of pot life and shelf life.
SCOPE
1.1 This test method covers the determination of the gel time of a solventless varnish mixed with a catalyst, if required, and exposed to elevated temperature. There are two methods presented here. New equipment for Method A is no longer available.  
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Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by Helical Coil Method

SIGNIFICANCE AND USE
5.1 This test method is used to determine the effect of exposure to elevated temperatures on the bond strength of combinations of magnet wire insulations and electrical insulating varnishes. The results are used as a guide for the comparison and selection of varnishes and combinations of varnishes and magnet wire insulation for specific applications. Test Methods D1932 and D3251 describe additional tests for determining the thermal endurance of insulating varnishes. A comprehensive evaluation of thermal characteristics includes a comparison of the thermal endurance determined in these different ways.  
5.2 This test method is useful for research and product qualifications purposes.
SCOPE
1.1 This test method covers the determination of the thermal endurance of electrical insulating varnishes alone or in combinations with magnet wire insulation. Changes in the helical coil bond strength are used as the test criteria. The coils are made from bare aluminum or copper wire, or from film- or fiber-insulated magnet wire.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
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ASTM D3955-20(Specification)
Standard Specification for Electrical Insulating Varnishes

ABSTRACT
This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process. The varnishes are classified according to grades: Grade DA; Grade DO; Grade DM; Grade DS; Grade DW; and Grade DT. This specification covers both flexible and rigid, solvent and solventless insulating varnishes. The insulating varnishes are classified according to thermal classes: Class 130; Class 155; Class 180; Class 200; and Class 220. Quality conformance tests shall be performed to conform to the specified requirements.
SCOPE
1.1 This specification covers the tests and values for electrical insulating varnishes, as supplied, which are suitable for the impregnation and treatment of electrical coils and windings applied by dip process.  
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Grade DA—Air-dry
Grade DO—Organic solvent containing, baking,
Grade DM—Reactive diluent containing,  
Grade DS—Silicone,
Grade DW—Water containing, and
Grade DT—Thixotropic.  
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SIGNIFICANCE AND USE
5.1 A major factor affecting the long term performance of insulating materials is thermal degradation. It is possible that factors, such as moisture and vibration, will cause failures after the material has been weakened by thermal degradation.  
5.2 An electrical insulating varnish is effective in protecting electrical equipment only as long as it retains its physical and electrical integrity.  
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SCOPE
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5.1 Values obtained by flexural tests can provide information with regard to the bond strength of the particular varnish, in combination with a particular wire, when measured under conditions described in this test method.
SCOPE
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SIGNIFICANCE AND USE
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5.1 This test method is useful for the evaluation of insulating varnish performance in chemical exposure.
SCOPE
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SIGNIFICANCE AND USE
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