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ASTM D1457

1992 Edition, October 30, 1992

Complete Document

Standard Specification for Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials



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Superseded By: ASTM D4894

EN
Additional Comments:
W/D 1996 S/S BY ASTM D 4894 & ASTM D 4895
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Product Details:

  • Revision: 1992 Edition, October 30, 1992
  • Published Date: October 30, 1992
  • Status: Superseded By:
  • Superseded By: ASTM D4894
  • Document Language: English
  • Published By: ASTM International (ASTM)
  • Page Count: 15
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

This specification covers molding and extrusion resins of polytetrafluoroethylene (PTFE) that have never been melted after preforming or molding and are normally processed by methods similar to those used in powder metallurgy or ceramics, or by ram extrusion or extrusion with a volatile aid. These PTFE resins are homopolymers of tetrafluoroethylene or copolymers containing not more than 1 % by weight of other fluoromonomers. The usual methods of processing thermoplastics generally are not applicable to these materials because of their viscoelastic properties at processing temperatures. The materials included herein do not include mixtures of PTFE resin with additives such as colorants, fillers, plasticizers, any fabricated articles, or reprocessed or reground resin. The methods and properties included are those required to identify the various types of resins. Additional procedures are provided in Appendix XI for further characterization of the resins.

The values stated in SI units as detailed in Practice E 380 are to be regarded as the standard, and the practices of E 380 are incorporated herein.

The following precautionary caveat pertains only to the test methods portion, Section 13, of this specification: 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.