188宝金博页面版

Designation: D4733 − 24Standard Test Methods forSolventless Electrical Insulating Varnishes 1This standard is issued under the f i xed designation D4733; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (´) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 These test methods cover solventless varnishes usedprimarily as electrical, mechanical, and environmental protec-tion for electrical equipment.1.2 These test methods are used on solventless varnishesthat are applied by dipping (at atmospheric pressure conditionsor under vacuum followed by pressure or under pressure only),spraying, or brushing for the purpose of impregnating orsealing electrical equipment. The following test methods areincluded:Property Tests (Uncured): SectionDensity 7Flash Point 8Gel Time 9Monomer Content 10Rheological Properties (Non-Newtonian) 11Rotational Viscosity 12Performance Property Tests (cured):Bond Strength 13Coating Thickness 14Dielectric Strength 15Dielectric Strength-Using Metal Panels 16Permittivity and Dissipation Factor 17Build 181.3 The values stated in inch-pound units are to be regardedas the standard. The values in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specif i c hazard statements are given in 8.3, 15.5.1, and 15.5.2.N OTE 1—This test method is related to IEC 60455. Since both methodscontain multiple test procedures, many procedures are technically equiva-lent while others differ signif i cantly.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards: 2D93 Test Methods for Flash Point by Pensky-MartensClosed Cup TesterD115 Test Methods for Testing Solvent Containing Var-nishes Used for Electrical InsulationD149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power FrequenciesD150 Test Methods for AC Loss Characteristics and Permit-tivity (Dielectric Constant) of Solid Electrical InsulationD374/D374M Test Methods for Thickness of Solid Electri-cal InsulationD923 Practices for Sampling Electrical Insulating LiquidsD1475 Test Method for Density of Liquid Coatings, Inks,and Related ProductsD1711 Terminology Relating to Electrical InsulationD2196 Test Methods for Rheological Properties of Non-Newtonian Materials by Rotational ViscometerD2519 Test Method for Bond Strength of Electrical Insulat-ing Varnishes by the Helical Coil TestD3056 Test Method for Gel Time of Solventless VarnishesD3278 Test Methods for Flash Point of Liquids by SmallScale Closed-Cup ApparatusD3312 Test Method for Percent Reactive Monomer in Sol-ventless VarnishesD3487 Specif i cation for Mineral Insulating Liquid Used inElectrical ApparatusD3636 Practice for Sampling and Judging Quality of SolidElectrical Insulating MaterialsD6054 Practice for Conditioning Electrical Insulating Mate-rials for Testing (Withdrawn 2012) 3D8561 Test Method for Gel Time of Solventless Varnishesby Plunger Method1 These test methods are under the jurisdiction of ASTM Committee D09 onElectrical and Electronic Insulating Materials and is the direct responsibility ofSubcommittee D09.01 on Electrical Insulating Products.Current edition approved Dec. 1, 2024. Published December 2024. Originallyapproved in 1987. Last previous edition approved in 2017 as D4733 – 17. DOI:10.1520/D4733-24.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at www.astm.org/contact. For Annual Book ofASTM Standards volume information, refer to the standard’s Document Summarypage on the ASTM website.3 The last approved version of this historical standard is referenced onwww.astm.org.*A Summary of Changes section appears at the end of this standardCopyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1