1、Designation: D6338 10Standard 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 t
2、he 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 th
3、e 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 fun
4、ction; 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 ph
6、ase 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 po
7、lymercomposition 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 class
8、ification 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 equi
9、valent 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 safe
10、typroblems, 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 Property
11、Compression SetD412 Test Methods for Vulcanized Rubber and Thermo-plastic 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 Plastics
12、D883 Terminology Relating to PlasticsD1434 Test Method for Determining Gas PermeabilityCharacteristics of Plastic Film and SheetingD1566 Terminology Relating to RubberD2240 Test Method for Rubber PropertyDurometerHardnessD3182 Practice for RubberMaterials, Equipment, andProcedures for Mixing Standar
13、d Compounds and Prepar-ing Standard Vulcanized SheetsD3892 Practice for Packaging/Packing of PlasticsD4000 Classification System for Specifying Plastic Materi-als1This specification is under the jurisdiction of ASTM Committee D20 onPlastics and is the direct responsibility of Subcommittee D20.15 on
14、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 serv
15、iceastm.org. For Annual Book of ASTMStandards volume information, refer 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, Uni
16、ted States.D6869 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 t
17、he 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 Specific to This Standard:
18、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 thermoset rubber when compared to thesame unc
19、rosslinked 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 thermoplasticelastomer with a chemically crosslink
20、ed 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 asshown in Table HCTPV.4.1.1 To illustrate this c
21、lassification 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 the incorporation of special or futuremateri
22、als, 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 designation shall show the specificrequirem
23、ents 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 indicates the fol-lowing, with the Table A requir
24、ements: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 MethodD2240, 5 s delay,5 = 14 MPa, tensile strength, min, Test MethodD412 at 23C,6 = 6.0 MPa, te
25、nsile strength, min, TestMethod D412 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.The designation HCTPV 0100 would indicate no propertiesbeing specified.4.3.2 Although the values listed are n
26、ecessary 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 property-table or cell-table requirements shall bes
27、pecified 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. Permissible suffixes arelisted in Table 3 of Classification D4000.5.1.1 Addition
28、al 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 require-ments, which always take precedence.7. General
29、 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 and their preparation shall conform toTable HCTPV a
30、nd 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 Practice E29.8.2.1 With the absolute method, an observed value or acalculated val
31、ue using the number of significant figures, asspecified by the test method used in determining the value, isnot rounded, but is to be compared directly with the limitingvalue. Conformance or nonconformance is based on thiscomparison.9. Sampling9.1 Sampling shall be statistically adequate to satisfy
32、therequirements of Section 13.Aunit of manufacture for shipmentshall be a production lot of HCTPV or a uniformly mixed blendof two or more such production lots.D6338 10210. Specimen Preparation10.1 Test specimens shall be prepared by a rigorouslyspecified injection molding process, unless specifical
33、ly men-tioned to the contrary. This process should be as specified inPractice D3182, 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 conditioned inthe standard laboratory atmosphe
34、re in accordance with Proce-dure A of Practice D618.11.2 Tests shall be carried out at 23 6 2C and 50 6 10 %relative humidity, in accordance with Practice D618.12. Test Methods12.1 Properties covered by this classification shall be mea-sured by the following Test Methods, as applicable: D395;D412; D
35、471; D573; D638; D1434; D2240; D6869.12.1.1 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 specification based on this classificationsystem shall be for c
36、onformance 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 change in IRM 903 oil; moisture content; airpermeability.
37、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 Certification shall be that the material was manufac-tured
38、 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 shall be furnished whenrequested. The report shall cons
39、ist 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 D3892 shall apply to packing; packaging andmarkings.15. Keywords15.1 dynamic vulcanization; highly crosslinked thermoplas-tic vulcani
40、zate; line callout; thermoplastic elastomer; thermo-plastic vulcanizateD6338 103TABLE HCTPV Requirement Details for Highly Crosslinked Thermoplastic VulcanizatesGroup Description Class Description Grade DescriptionHardness, TestMethod D2240,A/DDurometer, Typical,5 s delayTensile Strength,23C, TestMe
41、thod D412,MPa, minUltimate Elonga-tion, 23C, TestMethod D412,%minVolume Change,Test MethodD471, IRM 903oil, 70 h/125C,% maxCompres-sion Set,TestMethodD395,Method B,25 % de-flection, 22h/70C, %maxAir Aging,TestMethodD573,168h/150C, Ulti-mate Elon-gation, %change,maxMoisture,Test MethodD6869,%maxAir P
42、ermeabil-ity, TestMethod D1434,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 0.08 10000 Other2 Medium Hardness 1 80 A 9.0 440 85 45 40 0.08 100
43、02 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 0 Other02 Nitrile Rubber, 95% Crosslinked1 Low Hardness 1 70 A 4.
44、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 D638 used.BTemperature of 125C used.D6338104TABLE HCTPV Requirement Details for Highly Cross
45、linked Thermoplastic Vulcanizates (continued)Group Description Class Description Grade DescriptionHardness, TestMethod D2240,A/DDurometer, Typical,5 s delayTensile Strength,23C, TestMethod D412,MPa, minUltimate Elonga-tion, 23C, TestMethod D412,%minVolume Change,Test MethodD471, IRM 903oil, 70 h/125
46、C,% maxCompres-sion Set,TestMethodD395,Method B,25 % de-flection, 22h/70C, %maxAir Aging,TestMethodD573,168h/150C, Ulti-mate Elon-gation, %change,maxMoisture,Test MethodD6869,%maxAir Permeabil-ity, TestMethod D1434,Method V, 2.1kg/cm 30 psi,23C, 44 to 59% RH, cm2,mm/m2day,atm, max03 EPDM Rubber, 95%
47、 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 40 0.02 10000 Other3 Ultralow Hardness 1 35 A 2.5 300 170 25 40 0.02 10002
48、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 0.08 600 Other3 High Hardness 1 45 D 13.0 400 65 80 40 0.08 700 Other0 Oth
49、er 0 Other00 Other 0 Other 0 OtherD6338105TABLE A Detail Requirements for Highly Crosslinked Thermoplastic VulcanizatesDesignation Or-der NumberProperty 0 1 2 3 4 5 6 7 8 91 Hardness, Test MethodD2240, Shore A/D, 65unspecified 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, TestMethod D412,A100C,MPa, minunspecified 0.5 1.0 2.0 3.0 4.0 6.0 8.0 10.0 specify value4 Weight change, TestMethod D471, IRM 903oil, 24h/121C, % maxunspecified 18
