ASTM D4733-03

Standard Test Methods for Solventless Electrical Insulating Varnishes

STANDARD published on 1.10.2003

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The information about the standard:

Designation standards: ASTM D4733-03
Note: WITHDRAWN
Publication date standards: 1.10.2003
SKU: NS-28352
The number of pages: 5
Approximate weight : 15 g (0.03 lbs)
Country: American technical standard
Category: Technical standards ASTM

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Annotation of standard text ASTM D4733-03 :

Keywords:

bond strenth, coating thickness, density, dielectric strength, dissipation factor, flash point, gel time, monomer content, permittivity, solventless varnishes, varnishes, viscosity

Additional information

Significance and Use

The test methods referenced in these test methods are useful for control purposes during the manufacture and use of solventless varnishes.

1. 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
Flash Point
Gel Time
Monomer Content
Rheological Properties (Non-Newtonian)
Brookfield Viscosity
Performance Property Tests (cured):
Bond Strength
Coating Thickness
Dielectric Strength
Dielectric Strength-Using Metal Panels
Permittivity and Dissipation Factor
Build

1.3 The values stated in inch-pound units are to be regarded as the standard. The values in parentheses are for information only.

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. Specific hazard statements are given in 8.3, 15.5.1, and 15.5.2.

2. Referenced Documents

D923-15(2023)	Standard Practices for Sampling Electrical Insulating Liquids
D1475-13(2025)	Standard Test Method for Density of Liquid Coatings, Inks, and Related Products
D1711-26	Standard Terminology Relating to Electrical Insulation
D2196-20(2026)	Standard Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational Viscometer
D2519-19a(2025)	Standard Test Method for Bond Strength of Electrical Insulating Varnishes by the Helical Coil Test (Includes all amendments and changes 12/23/2025).
D3056-23	Standard Test Method for Gel Time of Solventless Varnishes
D3278-21	Standard Test Methods for Flash Point of Liquids by Small Scale Closed-Cup Apparatus
D3312-25	Standard Test Method for Percent Reactive Monomer in Solventless Varnishes
D3487-25	Standard Specification for Mineral Insulating Liquid Used in Electrical Apparatus
D3636-24	Standard Practice for Sampling and Judging Quality of Solid Electrical Insulating Materials
D6054-97	Standard Practice for Conditioning Electrical Insulating Materials for Testing
E176-24a	Standard Terminology of Fire Standards (Includes all amendments and changes 12/9/2024).
IEC 60455	Resin Based Reactive Compunds Used for Electrical Insulation
D374-99	Standard Test Methods for Thickness of Solid Electrical Insulation
D93-26	Standard Test Methods for Flash Point by Pensky-Martens Closed Cup Tester
D115-17(2024)	Standard Test Methods for Testing Solvent Containing Varnishes Used for Electrical Insulation
D149-25	Standard Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D150-22	Standard Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
D168-94(2000)	Standard Test Method for Coke Residue of Creosote (Withdrawn 2006)

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