ASTM D6338-17
(Classification)Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPV) Based on ASTM Standard Test Methods
Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPV) Based on ASTM Standard Test Methods
SCOPE
1.1 This classification system covers highly crosslinked thermoplastic vulcanizates (HCTPV) for extrusion, molding and other fabrication methods. Highly crosslinked thermoplastic vulcanizates (HCTPV) are thermoplastic elastomers (TPE) 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 HCTPV are not covered in this classification system.
1.2 The properties included in this standard are those required to identify the compositions covered. Other requirements necessary to identify particular characteristics important to specialized applications are to be specified by using suffixes as given in Section 5.
1.3 This classification system and subsequent line callout (specification) are intended to provide a means of calling out plastic materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can be made by those having expertise in the plastic field only after careful consideration of the design and the performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the costs involved, and the inherent properties of the material other than those covered by this standard.
1.4 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.
1.5 This standard is based on testing completed in accordance with ASTM standard test methods.
1.6 The following safety hazards caveat pertains only to the test methods portion, Section 11, of this classification system. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Buy Standard
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:D6338 −17
Standard Classification System for
Highly Crosslinked Thermoplastic Vulcanizates (HCTPV)
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.
NOTE 1—There is no known ISO equivalent to this standard.
1. Scope*
1.5 This standard is based on testing completed in accor-
1.1 This classification system covers highly crosslinked
dance with ASTM standard test methods.
thermoplastic vulcanizates (HCTPV) for extrusion, molding
and other fabrication methods. Highly crosslinked thermoplas-
1.6 The following safety hazards caveat pertains only to the
tic vulcanizates (HCTPV) are thermoplastic elastomers (TPE)
test methods portion, Section 11, of this classification system.
consisting of two or more polymer systems at least one of
This standard does not purport to address all of the safety
which is rubbery and highly (>95 %) crosslinked and at least
concerns, if any, associated with its use. It is the responsibility
oneofwhichisthermoplastic,witheachsystemhavingitsown
of the user of this standard to establish appropriate safety,
phase. The thermoplastic phase will tend to be continuous and
health and environmental practices and determine the appli-
therubberyphasediscontinuous.Thehighlevelofcrosslinking
cability of regulatory limitations prior to use.
and ultrafine particle size (ca 1 µm diameter) of the rubbery
1.7 This international standard was developed in accor-
phase give rise to properties more closely approaching those of
dance with internationally recognized principles on standard-
conventional thermoset rubber, when compared to the same
ization established in the Decision on Principles for the
thermoplastic/rubbery polymer composition with a lower level
Development of International Standards, Guides and Recom-
(≤95 %) of crosslinking. The HCTPV polymer compositions
mendations issued by the World Trade Organization Technical
may contain fillers, reinforcing agents, plasticizers, resins,
Barriers to Trade (TBT) Committee.
antidegradants, colorants and other beneficial constituents.
Recycled HCTPV are not covered in this classification system. 2. Referenced Documents
2
2.1 ASTM Standards:
1.2 The properties included in this standard are those
required to identify the compositions covered. Other require- D395 Test Methods for Rubber Property—Compression Set
ments necessary to identify particular characteristics important D412 Test Methods forVulcanized Rubber andThermoplas-
to specialized applications are to be specified by using suffixes tic Elastomers—Tension
as given in Section 5. D471 Test Method for Rubber Property—Effect of Liquids
D573 Test Method for Rubber—Deterioration in an Air
1.3 This classification system and subsequent line callout
Oven
(specification) are intended to provide a means of calling out
D618 Practice for Conditioning Plastics for Testing
plastic materials used in the fabrication of end items or parts.
D638 Test Method for Tensile Properties of Plastics
It is not intended for the selection of materials. Material
D883 Terminology Relating to Plastics
selection can be made by those having expertise in the plastic
D1434 TestMethodforDeterminingGasPermeabilityChar-
field only after careful consideration of the design and the
acteristics of Plastic Film and Sheeting
performance required of the part, the environment to which it
D1566 Terminology Relating to Rubber
will be exposed, the fabrication process to be employed, the
D2240 Test Method for Rubber Property—Durometer Hard-
costsinvolved,andtheinherentpropertiesofthematerialother
ness
than those covered by this standard.
D3182 PracticeforRubber—Materials,Equipment,andPro-
1.4 As given in IEEE/ASTM SI-10, values in SI units are to
cedures for Mixing Standard Compounds and Preparing
be regarded as standard.
Standard Vulcanized Sheets
D3892 Practice for Packaging/Packing of Plastics
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, 2017. Published August 2017. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1998. Last previous edition approved in 2010 as D6338 - 10. DOI: Standards volume information, refer to the s
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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 − 10 D6338 − 17
Standard Classification System for
Highly Crosslinked Thermoplastic Vulcanizates
1
(HCTPVs)(HCTPV) 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)(HCTPV) for extrusion, molding
and other fabrication methods. HCTPVs Highly crosslinked thermoplastic vulcanizates (HCTPV) are thermoplastic elastomers
(TPEs)(TPE) 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
HCTPVsHCTPV are not covered in this classification system.
1.2 Included The properties included in this classification system are the properties standard are those required to identify the
compositions covered. Other requirements necessary to identify the respective compositions. For specialized applications, other
requirements may be needed to identify specific characteristics.particular characteristics important to specialized applications are
to be specified by using suffixes as given in Section 5.
1.3 This classification system and subsequent line callout (specification) are intended to provide a means of calling out plastic
materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can be
made by those having expertise in the plastic field only after careful consideration of the design and the performance required of
the part, the environment to which it will be exposed, the fabrication process to be employed, the costs involved, and the inherent
properties of the material other than those covered by this standard.
1.4 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.
1.5 This standard is based on testing completed in accordance with ASTM standard test methods.
1.6 The following safety hazards caveat pertains only to the test methods portion, Section 1211, of this classification system.This
standard does not purport to address all of the safety problems,concerns, if any, associated with its use. It is the responsibility of
the user of this standard to establish appropriate safety safety, health and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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 Aug. 1, 2010Aug. 1, 2017. Published September 2010August 2017. Originally approved in 1998. Last previous edition approved in 20092010
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.