ASTM D6338-10
(Classification)Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs) Based on ASTM Standard Test Methods
Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs) Based on ASTM Standard Test Methods
SCOPE
1.1 This classification system covers highly crosslinked thermoplastic vulcanizates (HCTPVs) for extrusion, molding and other fabrication methods. HCTPVs are thermoplastic elastomers (TPEs) consisting of two or more polymer systems at least one of which is rubbery and highly (>95 %) crosslinked and at least one of which is thermoplastic, with each system having its own phase. The thermoplastic phase will tend to be continuous and the rubbery phase discontinuous. The high level of crosslinking and ultrafine particle size (ca 1 μm diameter) of the rubbery phase give rise to properties more closely approaching those of conventional thermoset rubber, when compared to the same thermoplastic/rubbery polymer composition with a lower level (≤95 %) of crosslinking. The HCTPV polymer compositions may contain fillers, reinforcing agents, plasticizers, resins, antidegradants, colorants and other beneficial constituents. Recycled HCTPVs are not covered in this classification system.
1.2 Included in this classification system are the properties necessary to identify the respective compositions. For specialized applications, other requirements may be needed to identify specific characteristics.
1.3 As given in , values in SI units are to be regarded as standard.
Note 1—There is no known ISO equivalent to this standard.
1.4 This standard is based on testing completed in accordance with ASTM standard test methods.
1.5 The following safety hazards caveat pertains only to the test methods portion, Section 12, of this classification system. This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:D6338 −10
Standard Classification System for
Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs)
1
Based on ASTM Standard Test Methods
This standard is issued under the fixed designation D6338; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This classification system is intended as a means for the callout of materials for the fabrication of
parts or end-use items. It is not intended for material selection, which should be performed by those
with special expertise in the materials field. Material selection should be made after careful
consideration of: part performance and design; the environment in which the part must function; the
material properties covered and not covered by this classification system; the desired service lifetime
of the part; the fabrication process for the part; and material and fabrication costs.
1. Scope* 1.4 This standard is based on testing completed in accor-
dance with ASTM standard test methods.
1.1 This classification system covers highly crosslinked
1.5 The following safety hazards caveat pertains only to the
thermoplastic vulcanizates (HCTPVs) for extrusion, molding
test methods portion, Section 12, of this classification system.
and other fabrication methods. HCTPVs are thermoplastic
This standard does not purport to address all of the safety
elastomers (TPEs) consisting of two or more polymer systems
problems, if any, associated with its use. It is the responsibility
atleastoneofwhichisrubberyandhighly(>95 %)crosslinked
of the user of this standard to establish appropriate safety and
and at least one of which is thermoplastic, with each system
health practices and determine the applicability of regulatory
having its own phase. The thermoplastic phase will tend to be
limitations prior to use.
continuous and the rubbery phase discontinuous. The high
level of crosslinking and ultrafine particle size (ca 1 µm
2. Referenced Documents
diameter) of the rubbery phase give rise to properties more
2
2.1 ASTM Standards:
closely approaching those of conventional thermoset rubber,
D395 Test Methods for Rubber Property—Compression Set
when compared to the same thermoplastic/rubbery polymer
D412 Test Methods forVulcanized Rubber andThermoplas-
composition with a lower level (≤95 %) of crosslinking. The
tic Elastomers—Tension
HCTPV polymer compositions may contain fillers, reinforcing
D471 Test Method for Rubber Property—Effect of Liquids
agents, plasticizers, resins, antidegradants, colorants and other
D573 Test Method for Rubber—Deterioration in an Air
beneficial constituents. Recycled HCTPVs are not covered in
Oven
this classification system.
D618 Practice for Conditioning Plastics for Testing
1.2 Included in this classification system are the properties
D638 Test Method for Tensile Properties of Plastics
necessary to identify the respective compositions. For special-
D883 Terminology Relating to Plastics
izedapplications,otherrequirementsmaybeneededtoidentify
D1434 TestMethodforDeterminingGasPermeabilityChar-
specific characteristics.
acteristics of Plastic Film and Sheeting
1.3 As given in IEEE/ASTM SI-10, values in SI units are to
D1566 Terminology Relating to Rubber
be regarded as standard.
D2240 Test Method for Rubber Property—Durometer Hard-
ness
NOTE 1—There is no known ISO equivalent to this standard.
D3182 PracticeforRubber—Materials,Equipment,andPro-
cedures for Mixing Standard Compounds and Preparing
Standard Vulcanized Sheets
1
This specification is under the jurisdiction of ASTM Committee D20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
2
Materials. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Aug. 1, 2010. Published September 2010. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1998. Last previous edition approved in 2009 as D6338 - 09. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D6338-10. the ASTM website.
*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
1
---------------------- Page: 1 ----------------------
D6338−10
D3892 Practice for Packaging/Packing of Plastics where:
D4000 Classification System for Specifying Plastic Materi-
HCTPV 0110 = fully crosslinked thermoplastic vulcanizate,
als
based on EPDM rubber >95 % crosslinked,
D6869 Test Method for Coulometric and Volumetric Deter-
low hardness from Table HCTPV,
A = Table
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D6338–09 Designation: D6338 – 10
Standard Classification System for
Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs)
1
Based on ASTM Standard Test Methods
This standard is issued under the fixed designation D6338; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This classification system is intended as a means for the callout of materials for the fabrication of
parts or end-use items. It is not intended for material selection, which should be performed by those
with special expertise in the materials field. Material selection should be made after careful
consideration of: part performance and design; the environment in which the part must function; the
material properties covered and not covered by this classification system; the desired service lifetime
of the part; the fabrication process for the part; and material and fabrication costs.
1. Scope*
1.1 This classification system covers highly crosslinked thermoplastic vulcanizates (HCTPVs) for extrusion, molding and other
fabrication methods. HCTPVs are thermoplastic elastomers (TPEs) consisting of two or more polymer systems at least one of
whichisrubberyandhighly(>95 %)crosslinkedandatleastoneofwhichisthermoplastic,witheachsystemhavingitsownphase.
The thermoplastic phase will tend to be continuous and the rubbery phase discontinuous. The high level of crosslinking and
ultrafine particle size (ca 1 µm diameter) of the rubbery phase give rise to properties more closely approaching those of
conventional thermoset rubber, when compared to the same thermoplastic/rubbery polymer composition with a lower level
(#95 %) of crosslinking. The HCTPV polymer compositions may contain fillers, reinforcing agents, plasticizers, resins,
antidegradants, colorants and other beneficial constituents. Recycled HCTPVs are not covered in this classification system.
1.2 Included in this classification system are the properties necessary to identify the respective compositions. For specialized
applications, other requirements may be needed to identify specific characteristics.
1.3 As given in IEEE/ASTM SI-10, values in SI units are to be regarded as standard.
NOTE 1—There is no known ISO equivalent to this standard.
1.4 This standard is based on testing completed in accordance with ASTM standard test methods.
1.5 The following safety hazards caveat pertains only to the test methods portion, Section 12, of this classification system. This
standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior
to use.
2. Referenced Documents
2
2.1 ASTM Standards:
D395 Test Methods for Rubber PropertyCompression Set
D412 Test Methods for Vulcanized Rubber and Thermoplastic ElastomersTension
D471 Test Method for Rubber PropertyEffect of Liquids
D573 Test Method for RubberDeterioration in an Air Oven
D618 Practice for Conditioning Plastics for Testing
D638 Test Method for Tensile Properties of Plastics
D883 Terminology Relating to Plastics
D1434 Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting
1
This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials.
Current edition approved Sept.Aug. 1, 2009.2010. Published September 2009.2010. Originally approved in 1998. Last previous edition approved in 20032009 as
D6338 - 039. DOI: 10.1520/D6338-109.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*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.
1
---------------------- Page: 1 ----------------------
D6338 – 10
D1566 Terminology Relating to Rubber
D2240 Test Method for Rubber PropertyDurometer Hardness
D3182 Practice for RubberMaterials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard
Vulcanized Sheets
...
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