1、Designation: D 6338 03Standard Classification System forHighly Crosslinked Thermoplastic Vulcanizates (HCTPVs)1This standard is issued under the fixed designation D 6338; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of
2、last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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
3、 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 co
4、vered 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. Scope1.1 This classification system covers highly crosslinkedthermoplastic vulcanizates (HCTPVs) for extrusion, moldingand other f
5、abrication 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
6、 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 lev
7、el (#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 properti
8、esnecessary 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.NOTE 1There is no equivalent ISO standard.1.4 The following safet
9、y 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 pr
10、actices and determine the applicability of regulatorylimitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 395 Test Methods for Rubber PropertyCompressionSet2D 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTension2D 471 Test Method for Rubber PropertyEffect of Li
11、q-uids2D 573 Test Method for RubberDeterioration in an AirOven2D 618 Practice for Conditioning Plastics for Testing3D 638 Test Method for Tensile Properties of Plastics3D 883 Terminology Relating to Plastics3D 1434 Test Method for Determining Gas PermeabilityCharacteristics of Plastics and Sheeting4
12、D 1566 Terminology Relating to Rubber2D 2240 Test Method for Rubber PropertyDurometerHardness2D 3182 Practice for RubberMaterials, Equipment, andProcedures for Mixing Standard Compounds and Prepar-ing Standard Vulcanized Sheets2D 3892 Practice for Packaging/Packing of Plastics5D 4000 Classification
13、System for Specifying Plastics Mate-rials5D 4019 Standard Test Method for Moisture in Plastics byCoulometric Regeneration of Phosphorous Pentoxide61This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMa
14、terials.Current edition approved August 10, 2003. Published October 2003. Originallyapproved in 1998. Last previous edition approved in 1998 as D 6338 - 98.2Annual Book of ASTM Standards, Vol 09.01.3Annual Book of ASTM Standards, Vol 08.01.4Annual Book of ASTM Standards, Vol 15.09.5Annual Book of AS
15、TM Standards, Vol 08.02.6Discontinued; see 2001 Annual Book of ASTM Standards, Vol 08.02.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.E 29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specificati
16、ons7IEEE/ASTM SI-10 Standard for Use of the InternationalSystem of Units (SI): The Modern Metric System83. Terminology3.1 DefinitionsExcept for the terms defined below, tech-nical terms pertaining to materials covered by this classifica-tion system are given in Terminologies D 883 and D 1566.3.2 Def
17、initions 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 thermoplastic elastomer with achemically crosslinked rubbery phase, resulting in propertiescloser to those of a t
18、hermoset rubber when compared to thesame uncrosslinked composition.3.2.2 thermoplastic elastomer (TPE), na diverse family ofrubberlike materials that, unlike conventional vulcanized rub-bers, can be reprocessed and recycled like thermoplasticmaterials.3.2.3 thermoplastic vulcanizate (TPV), na thermo
19、plasticelastomer with a chemically crosslinked rubbery phase, pro-duced by the dynamic vulcanization.4. Classification4.1 Highly crosslinked thermoplastic vulcanizates are clas-sified into groups according to the rubbery polymer(s) present.These groups are subclassified into classes and grades assho
20、wn 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, 2 (class) = medium hardness, and 1 (grade)meeting the requirements in Table HCTPV.4.1.2 To enable
21、the incorporation of special or futurematerials, the “Other” category (0) for group, class and gradeis given in Table HCTPV. Basic properties can be obtainedfrom Table A.4.2 There is no distinction between reinforced and unrein-forced highly crosslinked thermoplastic vulcanizates.4.3 A six-character
22、 designation shall show the specificrequirements for the HCTPVs. This designation shall consist ofthe letter A and five digits comprising the property require-ments in the order they appear in Table A.4.3.1 The following is an example of this classificationsystem: Designation HCTPV 0110 A45643 indic
23、ates the fol-lowing, with the Table A requirements:where:HCTPV 0110 = fully crosslinked thermoplastic vulcani-zate, based on EPDM rubber 95 %crosslinked, low hardness from TableHCTPV,A = Table A property requirements,4=656 5 Shore A hardness, Test MethodD 2240, 5 s delay,5 = 14 MPa, tensile strength
24、, min, Test MethodD 412 at 23C,6 = 6.0 MPa, tensile strength, min, TestMethod D 412 at 100C,4 = 80 %, weight change, max, Test MethodD 471, IRM 903 oil, 24 h/121C, and3 = 30 %, compression set, max, Test MethodD 395, Procedure B, 22 h/100C.The designation HCTPV 0100 would indicate no propertiesbeing
25、 specified.4.3.2 Although the values listed are necessary to include therange of properties available in existing materials, users shouldnot infer that every possible combination of the propertiesexists or can be obtained.5. Suffixes5.1 Necessary requirements for superseding or supplement-ing the pr
26、operty-table or cell-table requirements shall bespecified with suffixes. The first suffix letter indicates thespecial requirements needed; the second letter indicates the testmethod or conditions, or both, with a there-digit numberindicating the specific requirements. Permissible suffixes arelisted
27、in Table 3 of Classification D 4000.5.1.1 Additional suffixes will be added to this specificationas test requirements and methods are developed or requested,or both.6. Basic Requirements6.1 Basic requirements from property or cell tables arealways in effect, unless superseded by specific suffix requ
28、ire-ments, which always take precedence.7. General Requirements7.1 Material composition shall be uniform and shall con-form to the requirements of this specification. The productform and color of the HCTPVs shall be mutually agreed to bythe parties involved.8. Detail Requirements8.1 Test specimens a
29、nd their preparation shall conform toTable HCTPV and Table A, and applicable suffix requirements.8.2 For purposes of determining conformance, all specifiedlimits for a specification (line call out) based on this classifi-cation system are absolute limits, as defined in Practice E 29.8.2.1 With the a
30、bsolute method, an observed value or acalculated value is not rounded, but is to be compared directlywith the limiting value. Conformance or nonconformance isbased on this comparison.9. Sampling9.1 Sampling shall be statistically adequate to satisfy therequirements of Section 13. A unit of manufactu
31、re for shipmentshall be a production lot of HCTPV or a uniformly mixed blendof two or more such production lots.7Annual Book of ASTM Standards, Vol 14.02.8Available from ASTM International HeadquartersD633803210. Specimen Preparation10.1 Test specimens shall be prepared by a rigorouslyspecified inje
32、ction molding process, unless specifically men-tioned to the contrary. This process should be as specified inPractice D 3182, or as specified by the HCTPV supplier. Dueregard should be given to the anisotropic nature of HCTPVmolded parts.11. Conditioning11.1 Prior to testing, test specimens shall be
33、 conditioned inthe standard laboratory atmosphere in accordance with Proce-dure A of Practice D 618.11.2 Tests shall be carried out at 23 6 2C and 50 6 5percent relative humidity, in accordance with Practice D 618.12. Test Methods12.1 Properties covered by this classification shall be mea-sured by t
34、he following Test Methods, as applicable: D 395;D 412; D 471; D 573; D 638; D 1434; D 2240; D 4019.12.1.1 The number of tests shall be consistent with therequirements of Section 9 and 13.2.13. Inspection and Certification13.1 Inspection and certification of the material suppliedwith reference to a s
35、pecification based on this classificationsystem shall be for conformance to the requirements specifiedherein.13.2 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; we
36、ight change in IRM 903 oil; moisture content; airpermeability.13.3 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 13.4.1
37、3.4 Certification 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).13.5 A report of the test r
38、esults shall be furnished whenrequested. The report shall consist of the results of thelot-acceptance inspection for the shipment and the results ofthe most recent periodic-check inspection.14. Packaging and Marking14.1 Practice D 3892 shall apply to packing; packaging andmarkings.15. Keywords15.1 d
39、ynamic vulcanization; highly crosslinked thermoplas-tic vulcanizate; line callout; thermoplastic elastomer; thermo-plastic vulcanizateD6338033TABLEHCTPVRequirementDetailsforHighlyCrosslinkedThermoplasticVulcanizatesGroupDescriptionClassDescriptionGradeDescriptionHardness,TestMethodD2240,A/DDurometer
40、,Typical,5sdelayTensileStrength,23C,TestMethodD412,MPa,minUltimateElonga-tion,23C,TestMethodD412,%minVolumeChange,TestMethodD471,IRM903oil,70h/125C,%maxCompres-sionSet,TestMethodD395,MethodB,25%de-flection,22h/70C,%maxAirAging,TestMethodD573,168h/150C,Ulti-mateElon-gation,%change,maxMoisture,TestMet
41、hodD4019,%maxAirPermeabil- ity,TestMethod D1434,MethodV,2.1kg/cm30psi,23C,44to59%RH,cm2,mm/m2day,atm,max01EPDMRubber,95%Crosslinked1LowHardness155A3.62801203030.081000264A5.734011035300.081000373A7.03809040400.0810000Other2MediumHardness180A9.04408545400.081000287A14.04808055400.0810000Other3HighHar
42、dness140D17.05007065500.081000250D20.0A5006075500.0810000Other4UltralowHardness135A1.420016035400.081000245A2.120015035400.0810000Other0Other0Other02NitrileRubber,95%Crosslinked1LowHardness170A4.0175253050B0.1515000Other2MediumHardness180A7.0200204550B0.151500287A11.0300155550B0.1515000Other3HighHar
43、dness145D13.0350A156550B0.1515000Other0Other0OtherATestMethodD638used.BTemperatureof125Cused.D6338034TABLEHCTPVRequirementDetailsforHighlyCrosslinkedThermoplasticVulcanizates(continued)GroupDescriptionClassDescriptionGradeDescriptionHardness,TestMethodD2240,A/DDurometer,Typical,5sdelayTensileStrengt
44、h,23C,TestMethodD412,MPa,minUltimateElonga-tion,23C,TestMethodD412,%minVolumeChange,TestMethodD471,IRM903oil,70h/125C,%maxCompres-sionSet,TestMethodD395,MethodB,25%de-flection,22h/70C,%maxAirAging,TestMethodD573,168h/150C,Ulti-mateElon-gation,%change,maxMoisture,TestMethodD4019,%maxAirPermeabil- ity
45、,TestMethod D1434,MethodV,2.1kg/cm30psi,23C,44to59%RH,cm2,mm/m2day,atm,max03EPDMRubber,95%Crosslinked,Non-hygroscopic1LowHardness155A4.030016040400.021000265A6.040016040400.0210000Other2MediumHardness175A8.040014045400.021000280A9.05009050400.021000390A13.06006060400.0210000Other3UltralowHardness135
46、A2.530017025400.021000245A3.535017030400.0210000Other0Other0Other04Butyl/halobutylRub-ber,95%Crosslinked1LowHardness165A5.030013040400.08500Other2MediumHardness175A6.040011555400.0855285A10.04009075400.08600Other3HighHardness145D13.04006580400.08700Other0Other0Other00Other0Other0OtherD6338035TABLE A
47、 Detail Requirements for Highly Crosslinked Thermoplastic VulcanizatesDesignation Or-der NumberProperty 0 1 2 3 4 5 6 7 8 91 Hardness, Test MethodD 2240, Shore A/D, 65unspecified 35A 45A 55A 65A 75A 85A 40D 50D specify value2 Tensile strength, TextMethod D 412,A23C,MPa, minunspecified 2 4 7 10 14 18
48、 24 30 specify value3 Tensile strength, TestMethod D 412,A100C,MPa, minunspecified 0.5 1.0 2.0 3.0 4.0 6.0 8.0 10.0 specify value4 Weight change, TestMethod D 471, IRM 903oil, 24h/121C, % maxunspecified 180 140 100 80 60 40 20 10 specify value5 Compression set, TestMethod D 395, Method B,25 % defl.,
49、 22 h/100C,compression molded typeA specimens, % maxunspecified 20 25 30 35 40 50 65 80 specify valueAUse Test Method D 638 for 50D hardness.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical
