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ASTM D3955-04(2009)

(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
30-Sep-2009
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 - Standard Specification for Electrical Insulating Varnishes
Effective Date
01-Oct-2009
Replaced By
ASTM D3955-13 - Standard Specification for Electrical Insulating Varnishes
Effective Date
01-Apr-2013

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ASTM D3955-04(2009) - Standard Specification for Electrical Insulating Varnishes
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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 −04(Reapproved 2009) An American National Standard
Standard Specification for
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.
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
content is significantly different.
2.3 Other Standards:
NEMA MW1000 Magnet Wire
2. Referenced Documents
IEC 60455 Resin Based Reactive Compounds Used for
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-
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 Oct. 1, 2009. Published February 2010. Originally
approved in 1980. Last previous edition approved in 2004 as D3955–04. DOI: h.
10.1520/D3955-04R09.
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 Available from Global Engineering Documents, 15 Inverness Way, East
the ASTM website. Englewood, CO 80112-5704, http://www.global.ihs.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3955−04 (2009)
5.2 The thermal class is determined from the temperature exceed, all specification requirements.
index range as follows:
6.2 A varnish supplied under this specification is to be
Thermal Class Temperature Index Range
manufactured from one specific formula and one specific
130 130.0 to 154.9
process at one or more plants of the same company.
155 155.0 to 179.9
180 180.0 to 199.9
6.3 Changes involved solely with percent nonvolatile con-
200 200.0 to 219.9
tent or compatible solvent system, do not require requalifica-
220 220.0 and above
tion, if agreed upon between supplier and user.
6. General Specifications and Qualification Requirements
6.4 If any formula or process changes are desired after
6.1 All varnishes supplied under this specification must qualification approval has been granted, conduct the tests in
conform to the limits outlined in Table 1, and must meet, or Table 1, except for thermal class.
D3955−04 (2009)
TABLE 1 Specification Requirements
Grade Minimum Thermal Class
Type of Magnet
ASTM
Wire Over
Test Method
Class DA DO DM DS DW DT
which Varnish is
Applied
130 MW 35-C and D3251 and D3145 Class 130 for both wire types and both test methods
MW 16-C
155 MW 35-C and D3251 and D3145 Class 155 for both wire types and both test methods
MW 16-C
180 MW 35-C and D3251 and D3145 Class 180 for both wire types and both test methods
MW 16-C
200 MW 35-C and D3251 and D3145 Class 200 for both wire types and both test methods
MW 16-C
220 MW 35-C and D3251 a
...

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1.1 These test methods cover tests for solvent containing varnishes primarily intended to provide electrical, mechanical, and chemical protection for electrical equipment. These test methods include tests for control and performance as follows:    
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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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1.1 This test method covers the electrical performance in a specified water solution of an insulating varnish applied over enamelled magnet wire.  
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