1、Designation: D 6338 09Standard Classification System forHighly Crosslinked Thermoplastic Vulcanizates (HCTPVs)Based on ASTM Standard Test Methods1This standard is issued under the fixed designation D 6338; the number immediately following the designation indicates the year oforiginal adoption or, in
2、 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
3、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 f
4、unction; 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
5、) 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
6、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
7、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 cla
8、ssification 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.NOTE 1There is no known ISO eq
9、uivalent 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 sa
10、fetyproblems, 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:2D 395 Test Methods for Rubber Prope
11、rtyCompressionSetD 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTensionD 471 Test Method for Rubber PropertyEffect of LiquidsD 573 Test Method for RubberDeterioration in an AirOvenD 618 Practice for Conditioning Plastics for TestingD 638 Test Method for Tensile Properties of P
12、lasticsD 883 Terminology Relating to PlasticsD 1434 Test Method for Determining Gas PermeabilityCharacteristics of Plastic Film and SheetingD 1566 Terminology Relating to RubberD 2240 Test Method for Rubber PropertyDurometerHardnessD 3182 Practice for RubberMaterials, Equipment, andProcedures for Mi
13、xing Standard Compounds and Prepar-ing Standard Vulcanized SheetsD 3892 Practice for Packaging/Packing of Plastics1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on ThermoplasticMaterials.Current edition approved
14、Sept. 1, 2009. Published September 2009. Originallyapproved in 1998. Last previous edition approved in 2003 as D 6338 - 03.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, re
15、fer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.D 4000 Classification System for Specifying Plastic Mate-
16、rialsD 6436 Guide for Reporting Properties for Plastics andThermoplastic ElastomersD 6869 Test Method for Coulometric and Volumetric De-termination of Moisture in Plastics Using the Karl FischerReaction (the Reaction of Iodine with Water)E29 Practice for Using Significant Digits in Test Data toDeter
17、mine 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 Termino
18、logies D 883 and D 1566.3.2 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 thermoplastic elastomer with achemically crosslinked rubbery phase, resulting in p
19、ropertiescloser 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 vulcanized rub-bers, can be reprocessed and recycled like thermoplasticmaterials.3.2.3 thermoplast
20、ic 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 according to the rubbery polymer(s) present.These groups are subclassifie
21、d 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, 2 (class) = medium hardness, and 1 (grade)meeting the requirements
22、in Table HCTPV.4.1.2 To enable 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 v
23、ulcanizates.4.3 A six-character 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: Desi
24、gnation HCTPV 0110 A45643 indicates 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 del
25、ay,5 = 14 MPa, tensile strength, 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 wo
26、uld indicate no propertiesbeing 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 super
27、seding or supplement-ing the property-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 three-digit numberindicating the specific requirements.
28、Permissible suffixes arelisted 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 sup
29、erseded by specific suffix require-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 R
30、equirements8.1 Test specimens and their preparation shall conform toTable HCTPV and TableA, 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
31、Practice E 29.8.2.1 With the absolute method, an observed value or acalculated value using the number of significant figures, asspecified by D 6436, is not rounded, but is to be compareddirectly with the limiting value. Conformance or nonconfor-mance is based on this comparison.9. Sampling9.1 Sampli
32、ng shall be statistically adequate to satisfy therequirements of Section 13.Aunit of manufacture for shipmentD6338092shall be a production lot of HCTPV or a uniformly mixed blendof two or more such production lots.10. Specimen Preparation10.1 Test specimens shall be prepared by a rigorouslyspecified
33、 injection 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 withdue regard given to the anisotropic nature of HCTPV moldedparts.11. Conditioning11.1 Prior to testing, test specimens shall be
34、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 10 %relative humidity, in accordance with Practice D 618.12. Test Methods12.1 Properties covered by this classification shall be mea-sured by the fol
35、lowing Test Methods, as applicable: D 395;D 412; D 471; D 573; D 638; D 1434; D 2240; D 6869.12.1.1 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 specifi
36、cation 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; weight c
37、hange 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 13.4.13.4 Ce
38、rtification 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 results
39、 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 dynamic
40、 vulcanization; highly crosslinked thermoplas-tic vulcanizate; line callout; thermoplastic elastomer; thermo-plastic vulcanizateD6338093TABLE HCTPV Requirement Details for Highly Crosslinked Thermoplastic VulcanizatesGroup Description Class Description Grade DescriptionHardness, TestMethod D 2240, A
41、/DDurometer, Typical,5 s delayTensile Strength,23C, TestMethod D 412,MPa, minUltimate Elonga-tion, 23C, TestMethod D 412,%minVolume Change,Test MethodD 471, IRM 903oil, 70 h/125C,% maxCompres-sion Set,TestMethodD 395,Method B,25 % de-flection, 22h/70C, %maxAir Aging,TestMethodD 573,168h/150C, Ulti-m
42、ate Elon-gation, %change,maxMoisture,Test MethodD 6869, %maxAir Permeabil-ity, TestMethodD 1434,Method V, 2.1kg/cm 30 psi,23C, 44 to 59% RH, cm2,mm/m2day,atm, max01 EPDM Rubber,95 % Crosslinked1 Low Hardness 1 55 A 3.6 280 120 30 3 0.08 10002 64 A 5.7 340 110 35 30 0.08 10003 73 A 7.0 380 90 40 40 0
43、.08 10000 Other2 Medium Hardness 1 80 A 9.0 440 85 45 40 0.08 10002 87A 14.0 480 80 55 40 0.08 10000 Other3 High Hardness 1 40 D 17.0 500 70 65 50 0.08 10002 50 D 20.0A500 60 75 50 0.08 10000 Other4 Ultralow Hardness 1 35 A 1.4 200 160 35 40 0.08 10002 45 A 2.1 200 150 35 40 0.08 10000 Other0 Other
44、0 Other02 Nitrile Rubber, 95% Crosslinked1 Low Hardness 1 70 A 4.0 175 25 30 50B0.15 15000 Other2 Medium Hardness 1 80 A 7.0 200 20 45 50B0.15 15002 87 A 11.0 300 15 55 50B0.15 15000 Other3 High Hardness 1 45 D 13.0 350A15 65 50B0.15 15000 Other0 Other 0 OtherATest Method D 638 used.BTemperature of
45、125C used.D6338094TABLE HCTPV Requirement Details for Highly Crosslinked Thermoplastic Vulcanizates (continued)Group Description Class Description Grade DescriptionHardness, TestMethod D 2240, A/DDurometer, Typical,5 s delayTensile Strength,23C, TestMethod D 412,MPa, minUltimate Elonga-tion, 23C, Te
46、stMethod D 412,%minVolume Change,Test MethodD 471, IRM 903oil, 70 h/125C,% maxCompres-sion Set,TestMethodD 395,Method B,25 % de-flection, 22h/70C, %maxAir Aging,TestMethodD 573,168h/150C, Ulti-mate Elon-gation, %change,maxMoisture,Test MethodD 6869, %maxAir Permeabil-ity, TestMethodD 1434,Method V,
47、2.1kg/cm 30 psi,23C, 44 to 59% RH, cm2,mm/m2day,atm, max03 EPDM Rubber, 95% Crosslinked, Non-hygroscopic1 Low Hardness 1 55 A 4.0 300 160 40 40 0.02 10002 65 A 6.0 400 160 40 40 0.02 10000 Other2 Medium Hardness 1 75A 8.0 400 140 45 40 0.02 10002 80 A 9.0 500 90 50 40 0.02 10003 90 A 13.0 600 60 60
48、40 0.02 10000 Other3 Ultralow Hardness 1 35 A 2.5 300 170 25 40 0.02 10002 45 A 3.5 350 170 30 40 0.02 10000 Other0 Other 0 Other04 Butyl/halobutyl Rub-ber, 95 %Crosslinked1 Low Hardness 1 65 A 5.0 300 130 40 40 0.08 500 Other2 Medium Hardness 1 75 A 6.0 400 115 55 40 0.08 552 85 A 10.0 400 90 75 40
49、 0.08 600 Other3 High Hardness 1 45 D 13.0 400 65 80 40 0.08 700 Other0 Other 0 Other00 Other 0 Other 0 OtherD6338095TABLE A 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 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 value
