ASTM_D_4745_-_19.pdf

Designation:D474519Standard Classification System and Basis for Specification forFilled Polytetrafluoroethlyene(PTFE)Molding and ExtrusionMaterials Using ASTM Methods1This standard is issued under the fixed designation D4745;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 This standard classification system and basis for speci-fication covers polytetrafluoroethylene(PTFE)filled moldingcompounds made with virgin PTFE resins defined in Specifi-cation D4894,as Types II and III.NOTE1This system can be used as a model for other PTFEcompounds having particulate fillers that can survive the sinteringtemperatures of PTFE as can those listed in this standard.This system isrestricted to virgin PTFE base resin for technical reasons.Recycled orreprocessed material cannot be processed successfully.NOTE2The properties measured on commercially fabricated partsmay differ from the listed values for samples prepared by the proceduresgiven in this specification,depending on part geometry and processingparameters.Compounds used for ram extrusion are made from resins thatcomply with ASTM-D4745 Type II prior to their pre-sintering process.Property values measured on extruded products will vary from the listedvalues for Type II compounds which are prepared by the procedures givenbelow which standardize mold diameter and sintering cycle.End usersshould assess these expected variations in ram extruded products to ensuretheir suitable use in their specific application.1.2 The values stated in SI units are to be regarded asstandard.1.3 The following statement applies to the test methodportion,Section 11,of this specification:This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety,health,and environ-mental practices and determine the applicability of regulatorylimitations prior to use.See Note 5 for a specific warningstatement.NOTE3There is no known ISO equivalent to this standard.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 the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D792 Test Methods for Density and Specific Gravity(Rela-tive Density)of Plastics by DisplacementD883 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 PlasticsD4894 Specification for Polytetrafluoroethylene(PTFE)Granular Molding and Ram Extrusion MaterialsIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System33.Terminology3.1 DefinitionsThe terminology given in TerminologyD883 is applicable to this specification unless otherwisespecified.3.2 Definitions of Terms Specific to This Standard:3.2.1 bulk density,nthe mass in kilograms per cubic literof resin compound measured under the conditions of the test.3.2.2 filled compound,nblend of PTFE resin as the matrixand particulate fillers,generally glass,other inorganic,metallic,or polymeric materials that withstand the sinteringtemperature of PTFE(327 to 380C).3.2.3 free-flow resins(pelletized),ngenerally made bytreatment of finely divided resins to produce free-flowingagglomerates.3.2.4 lot,none production run.3.2.5 pigmented compound,na compound in which apigment is added for colorant purposes only.3.2.6 standard flow resins(nonpelletized),nfinely dividedresin with an average particle size less than 100 m.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved May 1,2019.Published June 2019.Originallyapproved in 1991.Last previous edition approved in 2014 as D4745-14.DOI:10.1520/D4745-19.2For 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.3Available from ASTM International Headquarters,100 Barr Harbor Drive,West Conshohocken,PA 19428*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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDev