1、Designation:D 3214 96Standard Test Methods forCoating Powders and Their Coatings Used for ElectricalInsulation1This standard is issued under the fixed designation D 3214;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover the evaluation of the proper-ties of organic resinous powders and their fused coatings usedfor elect
3、rical insulation.NOTE1These test methods do not apply to ceramic,glass,or metalpowder.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns,if any,associated
4、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.For specific hazardstatements,see Section 5.2.Referenced Documents2.1 ASTM Standards:D 149 Test Method for D
5、ielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulating Materialsat Commercial Power Frequencies2D 150 Test Methods for AC Loss Characteristics and Per-mittivity(Dielectric Constant)of Solid Electrical Insulat-ing Materials2D 257 Test Methods for D-C Resistance or Conductan
6、ce ofInsulating Materials2D 522 Test Methods for Mandrel Bend Test of AttachedOrganic Coatings3D 523 Test Method for Specular Gloss3D 609 Practice for Preparation of Cold-Rolled Steel Panelsfor Testing Paint,Varnish,Conversion Coatings,andRelated Coating Products3D 618 Practice for Conditioning Plas
7、tics and ElectricalInsulating Materials for Testing4D 621 Test Methods for Deformation of Plastics UnderLoad4D 792 Test Methods for Specific Gravity(Relative Density)and Density of Plastics by Displacement4D 1040 Specification for Uninhibited Mineral Oil for Use inTransformers and in Oil Circuit Bre
8、akers5D 1895 Test Methods for Apparent Density,Bulk Factor,and Pourability of Plastic Materials6D 1898 Practice for Sampling of Plastics6D 1921 Test Methods for Particle Size(Sieve Analysis)ofPlastic Materials6D 2240 Test Method for Rubber PropertyDurometerHardness7D 2304 Test Method for Thermal Eva
9、luation of Rigid Elec-trical Insulating Materials2D 2967 Test Method for Edge Coverage of Coating Pow-ders8D 4217 Test Method for Gel Time of Thermosetting Coat-ing Powder8D 4242 Test Method for Glass Plate Flow for ThermosettingCoating Powders82.2National Fire Protection Association Bulletins:No.33
10、 Spray Finishing9No.654 Dust Explosion Prevention Plastics Industry93.Terminology3.1 Definitions:3.1.1 coating powder,na heat-fusible,finely divided,solid,resinous material to form electrical insulating coatings.3.1.1.1 DiscussionThe coating powder may contain fill-ers,colorants,curing agents,etc.,c
11、onsistent with producing thedesired coatings.The powder is applied by various methodssuch as spraying,sprinkling,or dipping.Usually hot parts areused.Heat causes the powder to melt and flow into a densecoating.3.1.2 powder coating,na coating produced by the use ofa heat-fusible coating powder.3.1.2.
12、1 DiscussionSome powder coatings thermoset afterfusion at the recommended temperature and there should belittle loss of volatile material.In general,the coating should be1These test methods are under the jurisdiction ofASTM Committee D-1 on Paintand Related Coatings,Materials,and Applications and ar
13、e the direct responsibilityof Subcommittee D01.51 on Powder Coatings.Current edition approved March 10,1996.Published May 1996.Originallypublished as D 3214 73.Last previous edition D 3214 91(1995).2Annual Book of ASTM Standards,Vol 10.01.3Annual Book of ASTM Standards,Vol 06.01.4Annual Book of ASTM
14、 Standards,Vol 08.01.5Discontinued,see 1979 Annual Book of ASTM Standards,Part 40.6Annual Book of ASTM Standards,Vol 08.02.7Annual Book of ASTM Standards,Vol 09.01.8Annual Book of ASTM Standards,Vol 10.02.9Available from the National Fire Protection Assn.,International,60 Battery-march St.,Boston,MA
15、 02110.1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTMsmooth,continuous,electrically insulating,and adherent to themetal,showing no evidence of unfused particles,holes,orpores.4.Summary of Test M
16、ethods4.1 These test methods describe the specific procedures forspecimen preparation and testing of powders and their coatingsused for electrical insulation.The powders are applied to metalsurfaces and fused with heat to form a coating.Whereverpossible,ASTM methods are referenced with notes on specialtreatment that may be required.5.Hazards5.1 WarningThe powders may be subject to dust explo-sions under certain conditions(see National Fire ProtectionAssociation Bulletins No.33 and No.654).5.2 Wa
