1、Designation:D329422Standard Specification forPolytetrafluoroethylene(PTFE)Resin Molded Sheet andMolded Basic Shapes1This standard is issued under the fixed designation D3294;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、 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 This specification establishes requirements and methodsof test for the material,dimensions,and workmanship,and thephysica
3、l and electrical properties of molded sheet in minimumthicknesses of 0.794 mm(132in.)manufactured from PTFEresin molding materials defined in Specification D4894.1.2 This specification also establishes requirements formolded basic shapes made from molding materials.Thisspecification is for products
4、300 mm(12 in.)or less in adimension parallel to and 12.7 mm(0.5 in.)or greater in thedimension perpendicular to the direction of the applied mold-ing pressure.1.3 The values stated in SI units are to be regarded as thestandard.1.4 The following precautionary caveat pertains only to thetest method po
5、rtion,Section 7,of this specification.Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety,health,andenvironmental practices and determine the applicability ofregulatory
6、 limitations prior to use.Special attention is called to13.2,13.3,13.6,13.8,and A1.NOTE1There is no known ISO equivalent to this standard.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Princip
7、les 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:2D149 Test Method for Dielectric Breakdown Voltage andDielectric Strength of Solid Electrical Insulat
8、ing Materialsat Commercial Power FrequenciesD374/D374M Test Methods for Thickness of Solid Electri-cal InsulationD618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by D
9、isplacementD883 Terminology Relating to PlasticsD1600 Terminology forAbbreviated Terms Relating to Plas-ticsD1708 Test Method for Tensile Properties of Plastics by Useof Microtensile SpecimensD3892 Practice for Packaging/Packing of PlasticsD4591 Test Method for Determining Temperatures andHeats of T
10、ransitions of Fluoropolymers by DifferentialScanning CalorimetryD4894 Specification for Polytetrafluoroethylene(PTFE)Granular Molding and Ram Extrusion MaterialsD5947 Test Methods for Physical Dimensions of SolidPlastics SpecimensE94/E94M Guide for Radiographic Examination Using In-dustrial Radiogra
11、phic FilmIEEE/ASTM SI-10 American National Standard for Use ofthe International System of Units(SI):The Modern MetricSystem3.Terminology3.1 Definitions:3.1.1 Definitions are in accordance with Terminology D883unless otherwise specified.1This specification is under the jurisdiction of ASTM Committee
12、D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials(Section D20.15.12).Current edition approved July 1,2022.Published July 2022.Originally approvedin 1974.Last previous edition approved in 2015 as D3294-15.DOI:10.1520/D3294-22.2For referenced ASTM standar
13、ds,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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,
14、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 Reco
15、mmendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.13.1.2 lot,none continuous production run or a uniformblend of two or more production runs of one size sheet ormolded basic shape.3.2 Abbreviations:3.2.1 Abbreviations are in accordance with TerminologyD1600
16、.4.Classification4.1 This specification covers the following four types ofmolded basic sheets and shapes:4.1.1 Type IPremium;normally used for exactingelectrical,mechanical,or chemical applications.4.1.2 Type IIGeneral purpose;for electrical,mechanical,and chemical applications not requiring premium material.4.1.3 TypeIIIMechanicalGrade;fornon-criticalchemical,electrical,and mechanical applications.4.1.4 Type IVUtility;having no electrical requirementsand with mechanical properties at a lower le