ASTM D6338-03

Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizate (HCTPVs)

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 IEEE/ASTM SI-10, values in SI units are to be regarded as standard.
Note 1—There is no equivalent ISO standard.
1.4 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.

General Information

• Status: Historical
• Publication Date: 09-Aug-2003
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Relations

• Replaces: ASTM D6338-98 - Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizate (HCTPVs)
• Effective Date: 10-Aug-2003
• Replaced By: ASTM D6338-09 - Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs) Based on ASTM Standard Test Methods
• Effective Date: 01-Sep-2009
• Referred By: ASTM D6924-03(2017) - Standard Specification for Preformed Thermoplastic Vulcanizate Elastomeric Joint Seals for Bridges
• Effective Date: 10-Aug-2003
• Referred By: ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
• Effective Date: 10-Aug-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D 6338 – 03
Standard Classification System for
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Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs)
This standard is issued under the fixed designation D 6338; 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 (e) 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 of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
1.1 This classification system covers highly crosslinked
limitations prior to use.
thermoplastic vulcanizates (HCTPVs) for extrusion, molding
and other fabrication methods. HCTPVs are thermoplastic
2. Referenced Documents
elastomers (TPEs) consisting of two or more polymer systems
2.1 ASTM Standards:
atleastoneofwhichisrubberyandhighly(>95 %)crosslinked
D 395 Test Methods for Rubber Property—Compression
and at least one of which is thermoplastic, with each system
2
Set
having its own phase. The thermoplastic phase will tend to be
D 412 Test Methods for Vulcanized Rubber and Thermo-
continuous and the rubbery phase discontinuous. The high
2
plastic Elastomers—Tension
level of crosslinking and ultrafine particle size (ca 1 µm
D 471 Test Method for Rubber Property—Effect of Liq-
diameter) of the rubbery phase give rise to properties more
2
uids
closely approaching those of conventional thermoset rubber,
D 573 Test Method for Rubber—Deterioration in an Air
when compared to the same thermoplastic/rubbery polymer
2
Oven
composition with a lower level (#95 %) of crosslinking. The
3
D 618 Practice for Conditioning Plastics for Testing
HCTPV polymer compositions may contain fillers, reinforcing
3
D 638 Test Method for Tensile Properties of Plastics
agents, plasticizers, resins, antidegradants, colorants and other
3
D 883 Terminology Relating to Plastics
beneficial constituents. Recycled HCTPVs are not covered in
D 1434 Test Method for Determining Gas Permeability
this classification system.
4
Characteristics of Plastics and Sheeting
1.2 Included in this classification system are the properties
2
D 1566 Terminology Relating to Rubber
necessary to identify the respective compositions. For special-
D 2240 Test Method for Rubber Property—Durometer
izedapplications,otherrequirementsmaybeneededtoidentify
2
Hardness
specific characteristics.
D 3182 Practice for Rubber—Materials, Equipment, and
1.3 As given in IEEE/ASTM SI-10, values in SI units are to
Procedures for Mixing Standard Compounds and Prepar-
be regarded as standard.
2
ing Standard Vulcanized Sheets
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NOTE 1—There is no equivalent ISO standard.
D 3892 Practice for Packaging/Packing of Plastics
D 4000 Classification System for Specifying Plastics Mate-
1.4 The following safety hazards caveat pertains only to the
5
test methods portion, Section 12, of this classification system. rials
D 4019 Standard Test Method for Moisture in Plastics by
This standard does not purport to address all of the safety
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problems, if any, associated with its use. It is the responsibility Coulometric Regeneration of Phosphorous Pentoxide
1 2
This specification is under the jurisdiction of ASTM Committee D20 on Annual Book of ASTM Standards, Vol 09.01.
3
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Annual Book of ASTM Standards, Vol 08.01.
4
Materials. Annual Book of ASTM Standards, Vol 15.09.
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Current edition approved August 10, 2003. Published October 2003. Originally Annual Book of ASTM Standards, Vol 08.02.
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approved in 1998. Last previous edition approved in 1998 as D 6338 - 98. Discontinued; see 2001 Annual Book of ASTM Standards, Vol 08.02.
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D6338–03
E 29 Practice for Using Significant Digits in Test Data to
4=65 6 5 Shore A hardness, Test Method
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Determine Conformance with Specifications
D 2240, 5 s delay,
IEEE/ASTM SI-10 Standard for Use of the International
5 = 14MPa,tensilestrength,min,TestMethod
8
System of Units (SI): The
...