ASTM_D_6338_-_10.pdf

Designation:D633810Standard Classification System forHighly Crosslinked Thermoplastic Vulcanizates(HCTPVs)Based on ASTM Standard Test Methods1This standard is issued under the fixed designation D6338;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.INTRODUCTIONThis classification system is intended as a means for the callout of materials for the fabrication ofparts or end-use items.It is not intended for material selection,which should be performed by thosewith special expertise in the materials field.Material selection should be made after carefulconsideration of:part performance and design;the environment in which the part must function;thematerial properties covered and not covered by this classification system;the desired service lifetimeof the part;the fabrication process for the part;and material and fabrication costs.1.Scope*1.1 This classification system covers highly crosslinkedthermoplastic vulcanizates(HCTPVs)for extrusion,moldingand other fabrication methods.HCTPVs are thermoplasticelastomers(TPEs)consisting of two or more polymer systemsat least one of which is rubbery and highly(95%)crosslinkedand at least one of which is thermoplastic,with each systemhaving its own phase.The thermoplastic phase will tend to becontinuous and the rubbery phase discontinuous.The highlevel of crosslinking and ultrafine particle size(ca 1 mdiameter)of the rubbery phase give rise to properties moreclosely approaching those of conventional thermoset rubber,when compared to the same thermoplastic/rubbery polymercomposition with a lower level(#95%)of crosslinking.TheHCTPV polymer compositions may contain fillers,reinforcingagents,plasticizers,resins,antidegradants,colorants and otherbeneficial constituents.Recycled HCTPVs are not covered inthis classification system.1.2 Included in this classification system are the propertiesnecessary to identify the respective compositions.For special-ized applications,other requirements may be needed to identifyspecific characteristics.1.3 As given in IEEE/ASTM SI-10,values in SI units are tobe regarded as standard.NOTE1There is no known ISO equivalent to this standard.1.4 This standard is based on testing completed in accor-dance with ASTM standard test methods.1.5 The following safety hazards caveat pertains only to thetest methods portion,Section 12,of this classification system.This standard does not purport to address all of the safetyproblems,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD471 Test Method for Rubber PropertyEffect of LiquidsD573 Test Method for RubberDeterioration in an AirOvenD618 Practice for Conditioning Plastics for TestingD638 Test Method for Tensile Properties of PlasticsD883 Terminology Relating to PlasticsD1434 Test Method for Determining Gas Permeability Char-acteristics of Plastic Film and SheetingD1566 Terminology Relating to RubberD2240 Test Method for Rubber PropertyDurometer Hard-nessD3182 Practice for RubberMaterials,Equipment,and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized Sheets1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Aug.1,2010.Published September 2010.Originallyapproved in 1998.Last previous edition approved in 2009 as D6338-09.DOI:10.1520/D6338-10.2For 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.*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 D3892 Practice for Packaging/Packing of PlasticsD4000 Classification System for Specifying Plastic Materi-alsD6869 Test Method for Coulometric and Volumetric Deter-mination of Moisture in Plastics Using the Karl FischerReaction(the Reaction of Iodine with Water)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsIEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System3.Terminology3.1 DefinitionsExcept for the terms defined below,tech-nical terms pertaining to materials covered by this classifica-tion system are given in Terminologies D883 and D1566.3.2 Definitions of Terms Sp