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ASTM D4733-03(2009)

(Test Method)

Standard Test Methods for Solventless Electrical Insulating Varnishes

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:  
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 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.
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.

General Information

Status
Historical
Publication Date
30-Sep-2009
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 D4733-03 - Standard Test Methods for Solventless Electrical Insulating Varnishes
Effective Date
01-Oct-2009
Replaced By
ASTM D4733-13 - Standard Test Methods for Solventless Electrical Insulating Varnishes
Effective Date
01-Apr-2013
Referred By
ASTM D6053-14(2018) - Standard Test Method for Determination of Volatile Organic Compound (VOC) Content of Electrical Insulating Varnishes
Effective Date
01-Oct-2009
Referred By
ASTM D1711-22 - Standard Terminology Relating to Electrical Insulation
Effective Date
01-Oct-2009
Referred By
ASTM D3955-20 - Standard Specification for Electrical Insulating Varnishes
Effective Date
01-Oct-2009

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ASTM D4733-03(2009) - Standard Test Methods for Solventless Electrical Insulating VarnishesASTM D4733-03(2009) - Standard Test Methods for Solventless Electrical Insulating Varnishes
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ASTM D4733-03(2009) - Standard Test Methods for Solventless Electrical Insulating Varnishes
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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
Designation: D4733 − 03(Reapproved 2009) An American National Standard
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
2
2.1 ASTM Standards:
1.1 These test methods cover solventless varnishes used
D93 Test Methods for Flash Point by Pensky-Martens
primarily as electrical, mechanical, and environmental protec-
Closed Cup Tester
tion for electrical equipment.
D115 Test Methods for Testing Solvent Containing Var-
1.2 These test methods are used on solventless varnishes
nishes Used for Electrical Insulation
that are applied by dipping (at atmospheric pressure conditions
D149 Test Method for Dielectric Breakdown Voltage and
or under vacuum or other certain pressure), spraying, or DielectricStrengthofSolidElectricalInsulatingMaterials
brushing for the purpose of impregnating or sealing electrical at Commercial Power Frequencies
D150 Test Methods forAC Loss Characteristics and Permit-
equipment. The following test methods are included:
tivity (Dielectric Constant) of Solid Electrical Insulation
Property Tests (Uncured): Section
Density 7 D168 Test Method for Coke Residue of Creosote (With-
3
Flash Point 8
drawn 2006)
Gel Time 9
D374 Test Methods for Thickness of Solid Electrical Insu-
Monomer Content 10
Rheological Properties (Non-Newtonian) 11
lation
Brookfield Viscosity 12
D923 Practices for Sampling Electrical Insulating Liquids
Performance Property Tests (cured):
D1475 Test Method For Density of Liquid Coatings, Inks,
Bond Strength 13
Coating Thickness 14
and Related Products
Dielectric Strength 15
D1711 Terminology Relating to Electrical Insulation
Dielectric Strength-Using Metal Panels 16
D2196 Test Methods for Rheological Properties of Non-
Permittivity and Dissipation Factor 17
Build 18
Newtonian Materials by Rotational (Brookfield type)
Viscometer
1.3 The values stated in inch-pound units are to be regarded
D2519 Test Method for Bond Strength of Electrical Insulat-
as the standard. The values in parentheses are for information
ing Varnishes by the Helical Coil Test
only.
D3056 Test Method for Gel Time of Solventless Varnishes
1.4 This standard does not purport to address all of the
D3278 Test Methods for Flash Point of Liquids by Small
safety concerns, if any, associated with its use. It is the Scale Closed-Cup Apparatus
responsibility of the user of this standard to establish appro- D3312 Test Method for Percent Reactive Monomer in Sol-
ventless Varnishes
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. Specific hazard D3487 Specification for Mineral Insulating Oil Used in
Electrical Apparatus
statements are given in 8.3, 15.5.1, and 15.5.2.
D3636 Practice for Sampling and Judging Quality of Solid
NOTE 1—This test method is related to IEC 60455. Since both methods
Electrical Insulating Materials
contain multiple test procedures, many procedures are technically equiva-
D6054 Practice for Conditioning Electrical Insulating Mate-
lent while others differ significantly.
rials for Testing
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 Encapsulat- contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ing Compounds. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Oct. 1, 2009. Published February 2010. Originally the ASTM website.
3
approved in 1987. Last previous edition approved in 2003 as D4733 – 03. DOI: The last approved version of this historical standard is referenced on
10.1520/D4733-03R09. www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D4733 − 03 (2009)
2.2 IEC Standards 5.3 Sampling Fluids Exhibiting Non-Newtonian Viscosity:
IEC 60455 Resin Based Reactive Compunds Used for Elec- 5.3.1 Sample solventless varnishes exhibiting non-
trical Insulation Newtonian viscosity in accordance with 5.2.3.
5.4 Use sample containers and sampling procedures in
3. Terminology
accordance with Test Method D923.
3.1 Definitions:
5.5 When a sampling method is needed to determine
3.1.1 For definitions of terms used in these test methods,
whe
...

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4.1 Gel time is important in determining batch uniformity and some processing characteristics. It is indicative of pot life and shelf life.
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SIGNIFICANCE AND USE
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.  
5.2 This test method is useful for research and product qualifications purposes.
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1.1 This test method covers the determination of the thermal endurance of electrical insulating varnishes alone or in combinations with magnet wire insulation. Changes in the helical coil bond strength are used as the test criteria. The coils are made from bare aluminum or copper wire, or from film- or fiber-insulated magnet wire.  
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ASTM D3955-20(Specification)
Standard Specification for Electrical Insulating Varnishes

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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SIGNIFICANCE AND USE
5.1 A major factor affecting the long term performance of insulating materials is thermal degradation. It is possible that factors, such as moisture and vibration, will cause failures after the material has been weakened by thermal degradation.  
5.2 An electrical insulating varnish is effective in protecting electrical equipment only as long as it retains its physical and electrical integrity.  
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SCOPE
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