ASTM D4733-17
Standard Test Methods for Solventless Electrical Insulating Varnishes

Standard No.

ASTM D4733-17

Release Date

2017

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D4733-17

Scope

1.1 These test methods cover solventless varnishes used primarily as electrical, mechanical, and environmental protection for electrical equipment. 1.2 These test methods are used on solventless varnishes that are applied by dipping (at atmospheric pressure conditions or under vacuum or other certain pressure), spraying, or brushing for the purpose of impregnating or sealing electrical equipment. The following test methods are included: Property Tests (Uncured): Section Density 7 Flash Point 8 Gel Time 9 Monomer Content 10 Rheological Properties (Non-Newtonian) 11 Rotational Viscosity 12 Performance Property Tests (cured): Bond Strength 13 Coating Thickness 14 Dielectric Strength 15 Dielectric Strength-Using Metal Panels 16 Permittivity and Dissipation Factor 17 Build 18 1.3 The values stated in inch-pound units are to be regarded as the standard. The values 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. Specific hazard statements are given in 8.3, 15.5.1, and 15.5.2. NOTE 1—This test method is related to IEC 60455. Since both methods contain multiple test procedures, many procedures are technically equivalent while others differ significantly. 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.

ASTM D4733-17 Referenced Document

• ASTM D115 Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
• ASTM D1475 Standard Test Method For Density of Liquid Coatings, Inks, and Related Products
• ASTM D149 Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
• ASTM D150 Standard Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
• ASTM D1711 Standard Terminology Relating to Electrical Insulation
• ASTM D2196 Standard Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational (Brookfield type) Viscometer
• ASTM D2519 Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test
• ASTM D3056 Standard Test Method for Gel Time of Solventless Varnishes*， 2023-10-01 Update
• ASTM D3278 Standard Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus
• ASTM D3312 Standard Test Method for Percent Reactive Monomer in Solventless Varnishes*， 2018-11-01 Update
• ASTM D3487 Standard Specification for Mineral Insulating Oil Used in Electrical Apparatus
• ASTM D3636 Standard Practice for Sampling and Judging Quality of Solid Electrical Insulating Materials*， 2019-04-01 Update
• ASTM D374 Standard Test Methods for Thickness of Solid Electrical Insulation
• ASTM D6054 Standard Practice for Conditioning Electrical Insulating Materials for Testing
• ASTM D923 Standard Practices for Sampling Electrical Insulating Liquids
• ASTM D93 Standard Test Methods for Flash-Point by Pensky-Martens Closed Cup Tester
• ASTM E176 Standard Terminology of Fire Standards

ASTM D4733-17 history

• 2017 ASTM D4733-17 Standard Test Methods for Solventless Electrical Insulating Varnishes
• 2013 ASTM D4733-13 Standard Test Methods for Solventless Electrical Insulating Varnishes
• 2003 ASTM D4733-03(2009) Standard Test Methods for Solventless Electrical Insulating Varnishes
• 2003 ASTM D4733-03 Standard Test Methods for Solventless Electrical Insulating Varnishes
• 1998 ASTM D4733-98 Standard Test Methods for Solventless Electrical Insulating Varnishes