1、Designation: D6338 17Standard Classification System forHighly Crosslinked Thermoplastic Vulcanizates (HCTPV)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 th
2、e 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 classification system covers highly crosslinkedthermoplastic vulcanizates (HCTPV
3、) for extrusion, moldingand other fabrication methods. Highly crosslinked thermoplas-tic vulcanizates (HCTPV) are thermoplastic elastomers (TPE)consisting of two or more polymer systems at least one ofwhich is rubbery and highly (95 %) crosslinked and at leastone of which is thermoplastic, with each
4、 system having its ownphase. The thermoplastic phase will tend to be continuous andthe rubbery phase discontinuous. The high level of crosslinkingand ultrafine particle size (ca 1 m diameter) of the rubberyphase give rise to properties more closely approaching those ofconventional thermoset rubber,
5、when compared to the samethermoplastic/rubbery polymer composition with a lower level(95 %) of crosslinking. The HCTPV polymer compositionsmay contain fillers, reinforcing agents, plasticizers, resins,antidegradants, colorants and other beneficial constituents.Recycled HCTPV are not covered in this
6、classification system.1.2 The properties included in this standard are thoserequired to identify the compositions covered. Other require-ments necessary to identify particular characteristics importantto specialized applications are to be specified by using suffixesas given in Section 5.1.3 This cla
7、ssification system and subsequent line callout(specification) are intended to provide a means of calling outplastic materials used in the fabrication of end items or parts.It is not intended for the selection of materials. Materialselection can be made by those having expertise in the plasticfield o
8、nly after careful consideration of the design and theperformance required of the part, the environment to which itwill be exposed, the fabrication process to be employed, thecosts involved, and the inherent properties of the material otherthan those covered by this standard.1.4 As given in IEEE/ASTM
9、 SI-10, values in SI units are tobe regarded as standard.NOTE 1There is no known ISO equivalent to this standard.1.5 This standard is based on testing completed in accor-dance with ASTM standard test methods.1.6 The following safety hazards caveat pertains only to thetest methods portion, Section 11
10、, of this classification system.This standard does not purport to address all of the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety,health and environmental practices and determine the appli-cability of regulatory
11、 limitations prior to use.1.7 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 Organiz
12、ation TechnicalBarriers to Trade (TBT) Committee.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 Rubber
13、Deterioration 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 RubberD2
14、240 Test Method for Rubber PropertyDurometer Hard-nessD3182 Practice for RubberMaterials, Equipment, and Pro-cedures for Mixing Standard Compounds and PreparingStandard Vulcanized SheetsD3892 Practice for Packaging/Packing of Plastics1This specification is under the jurisdiction of ASTM Committee D2
15、0 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved Aug. 1, 2017. Published August 2017. Originallyapproved in 1998. Last previous edition approved in 2010 as D6338 - 10. DOI:10.1520/D6338-17.2For referenced ASTM standards, visit th
16、e 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 Ba
17、rr 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 theDevelopment of International Standards, Guides and Recom
18、mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1D4000 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 w
19、ith 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
20、to materials covered by this classifica-tion system are given in Terminologies D883 and D1566.3.2 Definitions of Terms Specific to This Standard:3.2.1 dynamic vulcanization, nthe process of intimatemelt mixing a thermoplastic polymer with a suitably reactiverubbery polymer to generate a thermoplasti
21、c elastomer with achemically crosslinked rubbery phase, resulting in propertiescloser to those of a thermoset rubber when compared to thesame uncrosslinked composition.3.2.2 thermoplastic elastomer (TPE), na diverse family ofrubberlike materials that, unlike conventional vulcanizedrubbers, can be re
22、processed and recycled like thermoplasticmaterials.3.2.3 thermoplastic vulcanizate (TPV), na thermoplasticelastomer with a chemically crosslinked rubbery phase, pro-duced by the dynamic vulcanization.4. Classification4.1 Highly crosslinked thermoplastic vulcanizates are clas-sified into groups accor
23、ding to the rubbery polymer(s) present.These groups are subclassified into classes and grades asshown in Table HCTPV.4.1.1 To illustrate this classification system: the designationHCTPV 0121 would indicate HCTPV = highly crosslinkedthermoplastic vulcanizate, 01 (group) = EPDM rubber 95 %crosslinked,
24、 2 (class) = medium hardness, and 1 (grade)meeting the requirements in Table HCTPV.4.1.2 To enable the incorporation of special or futurematerials, the “Other” category for group (00), class (0), andgrade (0) is shown in Table HCTPV. Basic properties are to beobtained from Table A.4.1.2.1 Although t
25、he values listed are necessary to includethe range of properties available in existing materials, notevery possible combination of the properties exists or can beobtained.4.1.3 There is no distinction between reinforced and unre-inforced highly crosslinked thermoplastic vulcanizates.4.1.4 A six-char
26、acter designation shall show the specificrequirements for the HCTPV in the “Other” category. Thisdesignation shall consist of the letter A and five digits com-prising the property requirements in the order they appear inTable A.4.1.5 The following is an example of this classificationsystem: Designat
27、ion HCTPV 0110 A45643 indicates thefollowing, with the Table A requirements:where:HCTPV 0110 = fully crosslinked thermoplastic vulcanizate,based on EPDM rubber 95 % crosslinked,low hardness from Table HCTPV,A = Table A property requirements,4=656 5 Shore A hardness, Test MethodD2240, 5 s delay,5 = 1
28、4 MPa, tensile strength, min, Test MethodD412 at 23C,6 = 6.0 MPa, tensile strength, min, Test MethodD412 at 100C,4 = 80 %, weight change, max, Test MethodD471, IRM 903 oil, 24 h/121C, and3 = 30 %, compression set, max, Test MethodD395, Procedure B, 22 h/100C.4.1.6 If no properties are specified, the
29、 designation would beHCTPV 0110 A00000.5. Suffixes5.1 When additional requirements are needed that are notcovered by the basic requirements or cell-table requirements,they shall be indicated through the use of suffixes.5.1.1 Alist of suffixes can be found in Classification SystemD4000 (Table 3) and
30、are to be used for additional requirementsas appropriate. Additional suffixes will be added to thatstandard as test methods and requirements are developed andrequested.6. General Requirements6.1 Basic requirements from the property tables or celltables are always in effect unless superseded by speci
31、fic suffixrequirements, which always take precedence.6.2 The plastics composition shall be uniform and shallconform to the requirements specified herein.7. Detail Requirements7.1 The materials shall conform to the requirements inTables HCTPV, A, and suffix requirements as they apply.7.2 For purposes
32、 of determining conformance, all specifiedlimits for a specification (line callout) based on this classifica-tion system are absolute limits, as defined in Practice E29.7.2.1 With the absolute method, an observed value or acalculated value is not rounded, but is to be compared directlywith the limit
33、ing value. Conformance or nonconformance isbased on this comparison.8. Sampling8.1 Sampling shall be statistically adequate to satisfy therequirements of 12.4.8.2 Aunit of manufacture for shipment shall be a productionlot of HCTPV or a uniformly mixed blend of two or more suchproduction lots.9. Spec
34、imen Preparation9.1 Test specimens shall be prepared by a rigorously speci-fied injection molding process. This process shall be asspecified in Practice D3182, or as specified by the HCTPVD6338 172supplier, with due regard given to the anisotropic nature ofHCTPV molded parts.10. Conditioning10.1 Pri
35、or to testing, test specimens shall be conditioned inthe standard laboratory atmosphere in accordance with Proce-dure A of Practice D618.10.2 Tests shall be carried out at 23 6 2C and 50 6 10 %relative humidity.11. Test Methods11.1 Properties covered by this classification shall be mea-sured by the
36、following Test Methods, as applicable: D395;D412; D471; D573; D638; D1434; D2240; D6869.11.1.1 The number of samples tested shall be consistentwith the requirements of 8.1 and 12.4.12. Inspection and Certification12.1 Inspection and certification of the material suppliedwith reference to a specifica
37、tion based on this classificationsystem shall be for conformance to the requirements specifiedherein.12.2 Lot-acceptance inspection shall be the basis on whichacceptance or rejection of the lot is made. The lot-acceptanceinspection shall consist of the tests listed as they apply:hardness; weight cha
38、nge in IRM 903 oil; moisture content; airpermeability.12.3 Periodic-check inspection shall consist of the testsspecified for all requirements of the material under thisclassification system. Inspection frequency shall be adequate toensure the material is certifiable in accordance with 12.4.12.4 Cert
39、ification shall be that the material was manufac-tured by a process in statistical control, sampled, tested, andinspected in accordance with this classification system, andthat the average values for the lot meet the requirements of thespecification (line callout).NOTE 2The ASTM publication Manual o
40、n Presentation of Data andControl Chart Analysis, 8th Edition, stock number MNL7-8TH-EB,provides detailed information about statistical process control.12.5 A report of the test results shall be furnished whenrequested. The report shall consist of the results of thelot-acceptance inspection for the
41、shipment and the results ofthe most recent periodic-check inspection.13. Packaging and Marking13.1 Practice D3892 shall apply to packing; packaging andmarkings.14. Keywords14.1 dynamic vulcanization; highly crosslinked thermoplas-tic vulcanizate; line callout; thermoplastic elastomer; thermo-plastic
42、 vulcanizateD6338 173TABLEHCTPVRequirementDetailsforHighlyCrosslinkedThermoplasticVulcanizatesGroupDescriptionClassDescriptionGradeDescriptionHardness,TestMethodD2240,A/DDurometer,Typical,5sdelayTensileStrength,23C,TestMethodD412,MPa,minUltimateElongation,23C,TestMethodD412,%minVolumeChange,TestMeth
43、odD471,IRM903oil,70h/125C,%maxCompres-sionSet,TestMethodD395,MethodB,25%deflection, 22h/70C,%maxAirAging,TestMethodD573,168h/150C,Ulti-mateElongation, %change,maxMoisture,TestMethodD6869,%maxAirPermeability,TestMethodD1434,MethodV,2.1kg/cm30psi,23C,44to59%RH,cm2,mm/m2day,atm,max01EPDMRubber,95%Cross
44、linked1LowHardness155A3.62801203030.081000264A5.734011035300.081000373A7.03809040400.0810000Other2MediumHardness180A9.04408545400.081000287A14.04808055400.0810000Other3HighHardness140D17.05007065500.081000250D20.0A5006075500.0810000Other4UltralowHardness135A1.420016035400.081000245A2.120015035400.08
45、10000Other0Other0Other02NitrileRubber,95%Crosslinked1LowHardness170A4.0175253050B0.1515000Other2MediumHardness180A7.0200204550B0.151500287A11.0300155550B0.1515000Other3HighHardness145D13.0350A156550B0.1515000Other0Other0OtherATestMethodD638used.BTemperatureof125Cused.D6338 174TABLEHCTPVRequirementDe
46、tailsforHighlyCrosslinkedThermoplasticVulcanizates(continued)GroupDescriptionClassDescriptionGradeDescriptionHardness,TestMethodD2240,A/DDurometer,Typical,5sdelayTensileStrength,23C,TestMethodD412,MPa,minUltimateElongation,23C,TestMethodD412,%minVolumeChange,TestMethodD471,IRM903oil,70h/125C,%maxCom
47、pres-sionSet,TestMethodD395,MethodB,25%deflection, 22h/70C,%maxAirAging,TestMethodD573,168h/150C,Ulti-mateElongation, %change,maxMoisture,TestMethodD6869,%maxAirPermeability,TestMethodD1434,MethodV,2.1kg/cm30psi,23C,44to59%RH,cm2,mm/m2day,atm,max03EPDMRubber,95%Crosslinked,Non-hygroscopic1LowHardnes
48、s155A4.030016040400.021000265A6.040016040400.0210000Other2MediumHardness175A8.040014045400.021000280A9.05009050400.021000390A13.06006060400.0210000Other3UltralowHardness135A2.530017025400.021000245A3.535017030400.0210000Other0Other0Other04Butyl/halobutyl Rubber,95%Crosslinked1LowHardness165A5.030013
49、040400.0850Other02MediumHardness175A6.040011555400.0855285A10.04009075400.08600Other3HighHardness145D13.04006580400.08700Other0Other0Other00Other0Other0OtherD6338 175TABLE A Detail Requirements for Highly Crosslinked Thermoplastic VulcanizatesDesignationOrder NumberProperty 0 1 2 3 4 5 6 7 8 91 Hardness, Test MethodD2240, Shore A/D, 5unspecified 35A 45A 55A 65A 75A 85A 40D 50D specify value2 Tensile strength, TextMethod D412,A23C,MPa, minunspecified 2 4 7 10 14 18 24 30 specify value3 Tensile strength, TestMet
