ASTM D6338-17
Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPV) Based on ASTM Standard Test Methods

Standard No.

ASTM D6338-17

Release Date

2017

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D6338-17

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 (>958201;%) 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 (≤958201;%) 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 is

ASTM D6338-17 Referenced Document

• ASTM D1434 Standard Test Method for Determining Gas Permeability Characteristics of Plastic Film and Sheeting
• ASTM D1566 Standard Terminology Relating to Rubber
• ASTM D2240 Standard Test Method for Properties of Rubber &8212; Durometer Hardness
• ASTM D3182 Standard Practice for Rubber-Materials, Equipment, and Procedures for Mixing Standard Compounds and Preparing Standard Vulcanized Sheets
• ASTM D3892 Standard Practice for Packaging/Packing of Plastics
• ASTM D395 Standard Test Methods for Rubber Property-Compression Set
• ASTM D4000 Standard Classification System for Specifying Plastic Materials
• ASTM D412 Standard Test Methods for Vulcanized Rubber and Thermoplastic Elastomers8212;Tension
• ASTM D471 Standard Test Method for Rubber Property-Effect of Liquids
• ASTM D573 Standard Test Method for Rubber-Deterioration in an Air Oven
• ASTM D618 Standard Practice for Conditioning Plastics for Testing
• ASTM D638 Standard Test Method for Tensile Properties of Plastics
• ASTM D6869 Standard Test Method for Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction (the Reaction of Iodine with Water)
• ASTM D883 Standard Terminology Relating to Plastics
• ASTM E29 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
• IEEE/ASTM SI 10 American National Standard for Metric Practice

ASTM D6338-17 history

• 2017 ASTM D6338-17 Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPV) Based on ASTM Standard Test Methods
• 2010 ASTM D6338-10 Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs) Based on ASTM Standard Test Methods
• 2009 ASTM D6338-09 Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs) Based on ASTM Standard Test Methods
• 2003 ASTM D6338-03 Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizate (HCTPVs)
• 1998 ASTM D6338-98 Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizate (HCTPVs)