1、Designation:D489515Standard 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 the 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 plasticiz
4、ers;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
5、 inparentheses 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.I
6、t 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 tor
7、elated information in ISO 12086-1 and ISO 12086-2.2.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 DisplacementD883 Termi
8、nology Relating to PlasticsD1895 Test Methods for Apparent Density,Bulk Factor,andPourability of Plastic MaterialsD3892 Practice for Packaging/Packing of PlasticsD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4441 Specification for Aqueous Dispersio
9、ns of Polytetra-fluoroethyleneD4591 Test Method for Determining Temperatures andHeats of Transitions of Fluoropolymers by DifferentialScanning CalorimetryD4894 Specification for Polytetrafluoroethylene(PTFE)Granular Molding and Ram Extrusion MaterialsE11 Specification for Woven Wire Test Sieve Cloth
10、 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-10 Use of the International System of Units(SI):The Modern Metric System2.2 ISO Standards:4ISO 12086-
11、1 Plastics Fluoropolymer Dispersions and Mold-ing and Extrusion MaterialsPart 1:Designation andSpecificationISO 12086-2Plastics Fluoropolymer Dispersions andMolding and Extrusion MaterialsPart 2:Preparation ofTest Specimens and Determination of PropertiesISO13322-2 ParticlesizeanalysisImageanalysism
12、ethodsPart 2:Dynamic image analysis methods3.Terminology3.1 DefinitionsThe definitions given in TerminologyD883 are applicable to this specification.3.2 Definitions of Terms Specific to This Standard:1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct res
13、ponsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved May 1,2015.Published June 2015.Originallyapproved in 1989.Last previous edition approved in 2010 as D4895-10.DOI:10.1520/D4895-15.2Specifications for other forms of polytetrafluoroethylene are found in Specifi-cati
14、ons 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 information,refer to the standards Document Summary page onthe ASTM website.4Available from American National Standards In
15、stitute(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 Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.1 bulk density,nthe mass in grams per litre of
16、 resinmeasured under the conditions of the test.3.2.2 extended specific gravity(ESG),nthe specific grav-ity of a specimen of PTFE material molded as described in thisspecification and sintered(see 3.2.7)for an extended period oftime,compared to the sintering time for the measurement ofSSG(see 3.2.8),using the appropriate sintering schedule givenin this specification.3.2.3 lot,none production run or a uniform blend of twoor more production runs.3.2.4 preforming,vbcompacting powdered PTFE material
