ASTM_D_4733_-_13.pdf

Designation:D473313Standard Test Methods forSolventless Electrical Insulating Varnishes1This standard is issued under the fixed 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 or other certain pressure),spraying,orbrushing for the purpose of impregnating or sealing electricalequipment.The following test methods are included:Property Tests(Uncured):SectionDensity7Flash Point8Gel Time9Monomer Content10Rheological Properties(Non-Newtonian)11Brookfield Viscosity12Performance Property Tests(cured):Bond Strength13Coating Thickness14Dielectric Strength15Dielectric Strength-Using Metal Panels16Permittivity and Dissipation Factor17Build181.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.Specific hazardstatements are given in 8.3,15.5.1,and 15.5.2.NOTE1This test method is related to IEC 60455.Since both methodscontain multiple test procedures,many procedures are technically equiva-lent while others differ significantly.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 InsulationD168 Test Method for Coke Residue of Creosote(With-drawn 2006)3D374 Test Methods for Thickness of Solid Electrical Insu-lation(Withdrawn 2013)3D923 Practices for Sampling Electrical Insulating LiquidsD1475 Test Method For Density of Liquid Coatings,Inks,and Related ProductsD1711 Terminology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(Brookfield type)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 Specification for Mineral Insulating Oil Used inElectrical ApparatusD3636 Practice for Sampling and Judging Quality of SolidElectrical Insulating MaterialsD6054 Practice for Conditioning Electrical Insulating Mate-rials for Testing(Withdrawn 2012)3E176 Terminology of Fire Standards1These 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 Varnishes,Powders and Encapsulat-ing Compounds.Current edition approved April 1,2013.Published April 2013.Originallyapproved in 1987.Last previous edition approved in 2009 as D4733 03(2009).DOI:10.1520/D4733-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The 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 States1 2.2 IEC StandardsIEC 60455 Resin Based Reactive Compunds Used for Elec-trical Insulation3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in these test methods,refer to Terminology D1711.For definitions of terms associ-ated with fire issues,refer to Terminology E176.3.1.2 gel time,nof solventless varnish,the time requiredat a specified temperature for a solventless varnish to betransformed from a liquid state to a gel as measured with asuitable gel time apparatus.3.1.3 thixotropy,nthe property of a material to thin uponisothermal agitation and to thicken upon subsequent rest.3.1.4 varnish,electrical insulating,na liquid resin systemthat is applied to and cured on electrical components providingelectrical,mechanical,and environmental protection.3.1.4.1 Disc