1、Designation:D474514Standard 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 oforigi
2、nal 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 cover
3、s 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
4、 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
5、specification,depending on part geometry and processingparameters.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 does notpurport to address all of the safety concerns,if any,
6、associatedwith its use.It is the responsibility of the user of this standardto establish appropriate safety and health practices anddetermine the applicability of regulatory limitations prior touse.See Note 5 for a specific warning statement.NOTE3There is no known ISO equivalent to this standard.2.R
7、eferenced 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 Microt
8、ensile 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 terminolo
9、gy 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 metreof resin compound measured under the conditions of the test.3.2.2 filled compound,nblend of PTFE resin
10、 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,non
11、e 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.3.3 AbbreviationsAbbreviations are in accordance withTerminology D1600.PTFE is the
12、acronym for polytetrafluo-roethylene.4.Classification4.1 This specification covers the following two types ofPTFE compounds:4.1.1 Type IStandard flow resins(nonpelletized)material,for general-purpose compression molding.1This specification is under the jurisdiction of ASTM Committee D20 onPlastics a
13、nd is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Aug.1,2014.Published September 2014.Originallyapproved in 1991.Last previous edition approved in 2012 as D4745-11a01.DOI:10.1520/D4745-14.2For referenced ASTM standards,visit the ASTM website,ww
14、w.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 sect
15、ion appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.2 Type IIFree-flow resins(pelletized)material,forcompression molding,automatic molding,or ram extrusion.4.2 Grades of each type distinguished by th
16、e nature of thefiller(s)are listed in Tables 1-3.4.3 A one-line system is used to specify materials coveredby this specification.The system uses predefined cells to referto specific aspects of this specification,as the followingillustrates:SpecificationStandard Number:Type:Grade:Class:SpecialBlock:Notes:Example:SpecificationD4745 08II24.3.1 For this example,the line callout would be Specifica-tion D4745 11,Type II,Grade 2,and would specify afree-flowing(pelletized)composition of polytetrafluoroe
