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ASTM D115-02

(Test Method)

Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation

Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation

SCOPE
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:ProcedureSectionBuild37-41Dielectric Strength42-47Drainage25-31Flash Point17-19Nonvolatile Matter20-24Oil Resistance53-55Preparation of Test Specimens7Specific Gravity9-12Temperature Index48-49Time of Drying32-36Varnish Compatibility50-52Viscosity13-16
1.2 Where the entire test method is included in this standard, the precision and bias are not known unless given in the stated method.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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. For specific hazard statements, see Section 5.
Note 1—There is no equivalent IEC standard.

General Information

Status
Historical
Publication Date
09-Sep-2002
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 D115-98 - Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
Effective Date
10-Sep-2002
Replaced By
ASTM D115-07 - Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
Effective Date
01-May-2007
Referred By
ASTM D3251-19 - Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire
Effective Date
10-Sep-2002
Referred By
ASTM D6053-14(2018) - Standard Test Method for Determination of Volatile Organic Compound (VOC) Content of Electrical Insulating Varnishes
Effective Date
10-Sep-2002
Referred By
ASTM D7230-06(2021) - Standard Guide for Evaluating Polymeric Lining Systems for Water Immersion in Coating Service Level III Safety-Related Applications on Metal Substrates
Effective Date
10-Sep-2002
Referred By
ASTM D4209-07(2019) - Standard Practice for Determining Volatile and Nonvolatile Content of Cellulosics, Emulsions, Resin Solutions, Shellac, and Varnishes
Effective Date
10-Sep-2002
Referred By
ASTM D1711-22 - Standard Terminology Relating to Electrical Insulation
Effective Date
10-Sep-2002
Referred By
ASTM D4733-17 - Standard Test Methods for Solventless Electrical Insulating Varnishes
Effective Date
10-Sep-2002
Referred By
ASTM D2756-07(2017) - Standard Test Method for Weight Loss of Electrical Insulating Varnishes
Effective Date
10-Sep-2002
Referred By
ASTM D4882-17 - Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Twisted-Coil Test
Effective Date
10-Sep-2002
Referred By
ASTM D2519-19a - Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
Effective Date
10-Sep-2002
Referred By
ASTM D1084-16(2021) - Standard Test Methods for Viscosity of Adhesives
Effective Date
10-Sep-2002
Referred By
ASTM D2832-92(2016) - Standard Guide for Determining Volatile and Nonvolatile Content of Paint and Related Coatings
Effective Date
10-Sep-2002
Referred By
ASTM D1304-99(2020)e1 - Standard Test Methods for Adhesives Relative to Their Use as Electrical Insulation
Effective Date
10-Sep-2002
Referred By
ASTM D3955-20 - Standard Specification for Electrical Insulating Varnishes
Effective Date
10-Sep-2002

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ASTM D115-02 - Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical InsulationASTM D115-02 - Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
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ASTM D115-02 - Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
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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
An American National Standard
Designation:D115–02
Standard Test Methods for Testing
1
Solvent Containing Varnishes Used for Electrical Insulation
This standard is issued under the fixed designation D 115; 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 Dielectric Strength of Solid Electrical Insulating Materials
3
at Commercial Power Frequencies
1.1 These test methods cover tests for solvent containing
D 202 Test Methods for Sampling and Testing Untreated
varnishes primarily intended to provide electrical, mechanical,
3
Paper Used for Electrical Insulation
and chemical protection for electrical equipment. These test
D 287 TestMethodforAPIGravityofCrudePetroleumand
methods include tests for control and performance as follows:
2
Petroleum Products (Hydrometer Method)
Procedure Section
D 295 Test Methods for Varnished Cotton Fabrics Used for
Build 37-41
3
Dielectric Strength 42-47
Electrical Insulation
Drainage 25-31
D 374 Test Methods for Thickness of Solid Electrical Insu-
Flash Point 17-19
3
lation
Nonvolatile Matter 20-24
Oil Resistance 53-55
D 580 Specification for Greige Woven Glass Tapes and
Preparation of Test Specimens 7
4
Webbings
Specific Gravity 9-12
Temperature Index 48-49 D 611 Test Methods for Aniline Point and Mixed Aniline
2
Time of Drying 32-36
Point of Petroleum Products and Hydrocarbon Solvents
Varnish Compatibility 50-52
D 1475 Test Method for Density of Liquid Coatings, Inks,
Viscosity 13-16
5
and Related Products
1.2 Wheretheentiretestmethodisincludedinthisstandard,
D 1638 Method of Testing Urethane Foam Isocyanate Raw
the precision and bias are not known unless given in the stated 6
Materials
method.
D 1932 Test Method for Thermal Endurance of Flexible
1.3 The values stated in SI units are to be regarded as the 3
Electrical Insulating Varnishes
standard. The values given in parentheses are for information
D 2518 SpecificationforWovenGlassFabricsforElectrical
only. 7
Insulation
1.4 This standard does not purport to address all of the
D 2519 Test Method for Bond Strength of Electrical Insu-
safety concerns, if any, associated with its use. It is the 7
lating Varnishes by the Helical Coil Test
responsibility of the user of this standard to establish appro-
D 3145 Test Method for Thermal Endurance of Electrical
priate safety and health practices and determine the applica- 7
Insulating Varnishes by the Helical Coil Method
bility of regulatory limitations prior to use. For specific hazard
D 3251 Test Method for Thermal-Aging Characteristics of
statements, see Section 5.
Electrical Insulating Varnishes Applied Over Film-
7
Insulated Magnet Wire
NOTE 1—There is no equivalent IEC standard.
D 3278 Test Method for Flash Point of Liquids by Small
2. Referenced Documents 5
Scale Closed-Cup Apparatus
2.1 ASTM Standards: D 3487 Specification for Mineral Insulating Oil Used in
8
2
D 56 Test Method for Flash Point by Tag Closed Tester Electrical Apparatus
D 93 Test Methods for Flash Point by Pensky-Martens D 5032 Practice for Maintaining Constant Relative Humid-
7
2
Closed Cup Tester ity by Means of Aqueous Glycerin Solutions
D 149 Test Method for Dielectric Breakdown Voltage and
1
These test methods are under the jurisdiction of ASTM Committee D09 on
3
Electrical and Electronic Insulating Materials and are the direct responsibility of Annual Book of ASTM Standards, Vol 10.01.
4
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders and Encapsulat- Annual Book of ASTM Standards, Vol 07.01.
5
ing Compounds. Annual Book of ASTM Standards, Vol 06.01.
6
Current edition approved Sept. 10, 2002. Published October 2002. Originally Discontinued. See 1991 Annual Book of ASTM Standards, Vol 08.02.
7
published as D 115 – 41 T. Last previous edition D 115 – 98. Annual Book of ASTM Standards, Vol 10.02.
2 8
Annual Book of ASTM Standards, Vol 05.01. Annual Book of ASTM Standards, Vol 10.03.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D115–02
D 5423 Specification for Forced-Convection Laboratory 4.1.3 Flash point, and
3
Ovens for evaluation of Electrical Insulation 4.1.4 Nonvolatile matter by weight.
E 104 Practice for Maintaining Constant Relative Humidity 4.2 Performance—The following tests are useful for deter-
9
by Means of Aqueous Solutions mining the performance of varnishes during application and
use:
3. Terminology
4.2.1 Drainage,
3.1 Definitions: Definitions: 4.2.2 Time of drying,
3.1.1 dielectric strength—the voltage gradient at which 4.2.3 Build,
dielectric
...

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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.  
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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.  
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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.
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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.  
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4.1 This test method is useful in determining the performance of varnishes over enamelled magnet wire when subjected to the specified sodium chloride solution. It is useful in evaluating the resistance of varnished magnet wire to a diluted sodium chloride solution under applied voltage.
SCOPE
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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4.1 This test method determines the volatile organic content of an electrical insulating varnish. It utilizes a procedure where dishes containing a known amount of varnish are baked and the amount of volatile organic compound is measured. Calculations are performed to express this in g/L or lb/gal. This test method is applicable to all types of varnishes. However, waterborne varnishes while baked under the same conditions need to have water content determined and calculations performed in accordance with Practice D3960.  
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1.1 This test method covers the determination of the amount of volatile organic compounds emitted during cure of electrical insulating varnishes.  
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