1、Designation:D489518Standard Specification forPolytetrafluoroethylene(PTFE)Resin Produced FromDispersion1This standard is issued under the fixed designation D4895;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revisi
2、on.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification2covers polytetrafluoroethylen
3、e(PTFE)prepared by coagulation of a dispersion.These PTFEresins are homopolymers of tetrafluoroethylene or modifiedhomopolymers containing not more than 1%by weight ofother fluoromonomers.The materials covered herein do notinclude mixtures of PTFE with additives such as colors,fillers,or plasticizer
4、s;nor do they include reprocessed or regroundresin or any fabricated articles because the properties of suchmaterials have been irreversibly changed when they werefibrillated or sintered.1.2 The values stated in SI units as detailed in IEEE/ASTMSI-10 are to be regarded as standard.The values given i
5、nparentheses are for information only.1.3 The following safety hazards caveat pertains only to theSpecimen Preparation Section,Section 9,and the Test MethodsSection,Section 10,of this specification:This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It
6、is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.See Warning note in 9.1.1 for a specific hazardsstatement.NOTE1Information in this specification is technically equivalent torel
7、ated information in ISO 20568-1 and ISO 20568-2.1.4 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 th
8、e World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D618 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 Disp
9、lacementD883 Terminology Relating to PlasticsD1708 Test Method for Tensile Properties of Plastics by Useof Microtensile SpecimensD1895 Test Methods for Apparent Density,Bulk Factor,andPourability of Plastic MaterialsD3892 Practice for Packaging/Packing of PlasticsD4052 Test Method for Density,Relati
10、ve Density,and APIGravity of Liquids by Digital Density MeterD4441 Specification for Aqueous Dispersions of Polytetra-fluoroethyleneD4591 Test Method for Determining Temperatures andHeats of Transitions of Fluoropolymers by DifferentialScanning CalorimetryD4894 Specification for Polytetrafluoroethyl
11、ene(PTFE)Granular Molding and Ram Extrusion MaterialsE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsIEEE/ASTM SI
12、-10 Use of the International System of Units(SI):The Modern Metric System2.2 ISO Standards:4ISO 20568-1 Plastics Fluoropolymer Dispersions and Mold-ing and Extrusion MaterialsPart 1:Designation andSpecificationISO 20568-2Plastics Fluoropolymer Dispersions andMolding and Extrusion MaterialsPart 2:Pre
13、paration of1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Nov.1,2018.Published November 2018.Originallyapproved in 1989.Last previous edition approved in 2016 as
14、 D4895 16.DOI:10.1520/D4895-18.2Specifications for other forms of polytetrafluoroethylene are found in Specifi-cations D4441 and D4894.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume informa
15、tion,refer to the standards Document Summary page onthe ASTM website.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor
16、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 Test Specimens and Determination of PropertiesISO13322-2 ParticlesizeanalysisImageanalysismethodsPart 2:Dynamic image ana
