Standard Test Methods for Solventless Electrical Insulating Varnishes

SIGNIFICANCE AND USE
The test methods referenced in these test methods are useful for control purposes during the manufacture and use of solventless varnishes.
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):SectionDensityFlash PointGel TimeMonomer ContentRheological Properties (Non-Newtonian)Brookfield ViscosityPerformance Property Tests (cured):Bond StrengthCoating ThicknessDielectric StrengthDielectric Strength-Using Metal PanelsPermittivity and Dissipation FactorBuild
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.

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Publication Date
30-Sep-2003
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ASTM D4733-03 - Standard Test Methods for Solventless 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
An American National Standard
Designation:D4733–03
Standard Test Methods for
1
Solventless Electrical Insulating Varnishes
This standard is issued under the fixed designation D4733; 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 2. Referenced Documents
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1.1 These test methods cover solventless varnishes used 2.1 ASTM Standards:
primarily as electrical, mechanical, and environmental protec- D93 Test Methods for Flash Point by Pensky-Martens
tion for electrical equipment. Closed Cup Tester
1.2 These test methods are used on solventless varnishes D115 Test Methods for Testing Solvent Containing Var-
that are applied by dipping (at atmospheric pressure conditions nishes Used for Electrical Insulation
or under vacuum or other certain pressure), spraying, or D149 Test Method for Dielectric Breakdown Voltage and
brushing for the purpose of impregnating or sealing electrical Dielectric Strength of Solid Electrical Insulating Materials
equipment. The following test methods are included: at Commercial Power Frequencies
D150 Test Methods for AC Loss Characteristics and Per-
Property Tests (Uncured): Section
Density 7
mittivity (Dielectric Constant) of Solid Electrical Insula-
Flash Point 8
tion
Gel Time 9
3
D168 Test Method for Coke Residue of Creosote
Monomer Content 10
Rheological Properties (Non-Newtonian) 11
D374 Test Methods for Thickness of Solid Electrical Insu-
Brookfield Viscosity 12
lation
Performance Property Tests (cured):
D923 Practices for Sampling Electrical Insulating Liquids
Bond Strength 13
Coating Thickness 14
D1475 Test Method For Density of Liquid Coatings, Inks,
Dielectric Strength 15
and Related Products
Dielectric Strength-Using Metal Panels 16
Permittivity and Dissipation Factor 17 D1711 Terminology Relating to Electrical Insulation
Build 18
D2196 Test Methods for Rheological Properties of Non-
Newtonian Materials by Rotational (Brookfield type) Vis-
1.3 The values stated in inch-pound units are to be regarded
cometer
as the standard. The values in parentheses are for information
D2519 Test Method for Bond Strength of Electrical Insu-
only.
lating Varnishes by the Helical Coil Test
1.4 This standard does not purport to address all of the
D3056 Test Method for Gel Time of Solventless Varnishes
safety concerns, if any, associated with its use. It is the
D3278 Test Methods for Flash Point of Liquids by Small
responsibility of the user of this standard to establish appro-
Scale Closed-Cup Apparatus
priate safety and health practices and determine the applica-
D3312 Test Method for Percent Reactive Monomer in
bility of regulatory limitations prior to use. Specific hazard
Solventless Varnishes
statements are given in 8.3, 15.5.1, and 15.5.2.
D3487 Specification for Mineral Insulating Oil Used in
NOTE 1—This test method is related to IEC 60455. Since both methods
Electrical Apparatus
contain multiple test procedures, many procedures are technically equiva-
D3636 Practice for Sampling and Judging Quality of Solid
lent while others differ significantly.
Electrical Insulating Materials
D6054 Practice for Conditioning Electrical Insulating Ma-
terials for Testing
2.2 IEC Standards
IEC 60455 Resin Based Reactive Compunds Used for
1
These test methods are under the jurisdiction of ASTM Committee D09 on
2
Electrical and Electronic Insulating Materials and is the direct responsibility of For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Subcommittee D09.01 on Electrical Insulating Varnishes, Powders, and Encapsu- contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
lating Compounds. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Oct. 1, 2003. Published November 2003. Originally the ASTM website.
3
approved in 1987. Last previous edition approved in 1998 as D4733 – 98. DOI: Withdrawn. The last approved version of this historical standard is referenced
10.1520/D4733-03. on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4733–03
Electrical Insulation 5.4 Use sample containers and sampling procedures in
accordance with Test Method D923.
3. Terminology 5.5 When a sampling method is needed to determine
whether a lot meets the requirements of a material specifica-
3.1 Definitions: For definitions of terms used in these test
tion, use Practice D3636 as a guide.
methods, refer to Terminology D1711.
3.1.1 gel time, n—of solventless varnish, the time required
6. Con
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