ASTM D115-17 - 1.11.2017
 
Significance and Use

4.1 Control—The following tests are useful for control purposes during the manufacture and use of varnishes, and for determining the uniformity of batches:

4.1.1 Specific gravity,

4.1.2 Viscosity,

4.1.3 Flash point, and

4.1.4 Nonvolatile matter by weight.

4.2 Performance—The following tests are useful for determining the performance of varnishes during application and use:

4.2.1 Drainage,

4.2.2 Time of drying,

4.2.3 Build,

4.2.4 Dielectric strength,

4.2.5 Thermal endurance,

4.2.6 Varnish compatibility,

4.2.7 Salt water proofness, and

4.2.8 Oil resistance.

 
1. 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:

Procedure

Section

Build

38 – 42

Dielectric Strength

43 – 48

Drainage

26 – 32

Flash Point

18 – 20

Nonvolatile Matter

21 – 25

Oil Resistance

54 – 56

Preparation of Test Specimens

    7

Specific Gravity

9 – 12

Temperature Index

4950

Time of Drying

33 – 37

Varnish Compatibility

51 – 53

Viscosity

13 – 17

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 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, health, and environmental 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.

1.5 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

D295-12

Standard Test Methods for Varnished Cotton Fabrics Used for Electrical Insulation (Withdrawn 2020)

D374-99

Standard Test Methods for Thickness of Solid Electrical Insulation

D580-04

Standard Specification for Greige Woven Glass Tapes and Webbings

D1475-13(2020)

Standard Test Method for Density of Liquid Coatings, Inks, and Related Products

D1932-19

Standard Test Method for Thermal Endurance of Flexible Electrical Insulating Varnishes

D2518-99

Standard Specification for Woven Glass Fabrics for Electrical Insulation

D2519-19a

Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test (Includes all amendments and changes 11/14/2019).

D3145-20

Standard Test Method for Thermal Endurance of Electrical Insulating Varnishes by Helical Coil Method

D3251-19

Standard Test Method for Thermal Endurance Characteristics of Electrical Insulating Varnishes Applied Over Film-Insulated Magnet Wire

D3278-21

Standard Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus

D3487-16e1

Standard Specification for Mineral Insulating Oil Used in Electrical Apparatus (Includes all amendments and changes 1/1/2018).

D5032-19

Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Glycerin Solutions

D5423-23

Standard Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation

E104-20a

Standard Practice for Maintaining Constant Relative Humidity by Means of Aqueous Solutions (Includes all amendments and changes 12/21/2020).

D56-22

Standard Test Method for Flash Point by Tag Closed Cup Tester

D93-20

Standard Test Methods for Flash Point by Pensky-Martens Closed Cup Tester

D149-20

Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies

D202-23

Standard Test Methods for Sampling and Testing Untreated Paper Used for Electrical Insulation

D287-22

Standard Test Method for API Gravity of Crude Petroleum and Petroleum Products (Hydrometer/Method)