Standard Classification System for Highly Crosslinked Thermoplastic Vulcanizates (HCTPVs) Based on ASTM Standard Test Methods
|Publication Date:||1 September 2009|
|ICS Code (Thermoplastic materials):||83.080.20|
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 (greater than 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
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.
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.
This standard is based on testing completed in accordance with ASTM standard test methods.
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.
*A Summary of Changes section appears at the end of this standard.