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ASTM International - ASTM D4895-98

Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion

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Organization: ASTM International
Publication Date: 10 November 1998
Status: inactive
Page Count: 14
ICS Code (Thermosetting materials): 83.080.10
scope:

1.1 This specification covers dry-powder resins of polytetrafluoroethylene (PTFE) that have been prepared from dispersions of PTFE by manufacturing techniques that involve controlled coagulation of the dispersion. These resins are generally known as "fine-powder" resins or "coagulated-dispersion powder" resins. The conversion of these resins to finished products normally involves a process called "paste extrusion," and sometimes involves formative processes such as calendering. A volatile liquid is present as a processing aid during these formative stages of conversion, and is subsequently removed during the finishing stages of conversion. These PTFE resins are homopolymers of tetrafluoroethylene, or, in some cases, modified homopolymers 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. The materials covered herein do not include mixtures of PTFE with additives such as colors, fillers, or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles because the properties of such materials have been irreversibly changed when they were fibrillated or sintered. The methods and properties included are those required to identify the various resins. An additional procedure is provided in the appendix for further characterization of the resins.

1.2 The values stated in SI units as detailed in Practice E380 are to be regarded as the standard and the practices of E380 are incorporated herein.

1.3 The following safety hazards caveat pertains only to the Specimen Preparation Section, Section 9, and the Test Methods Section, Section 10, of this specification: 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 and health practices and determine the applicability of regulatory limitations prior to use. See Note 3 for a specific hazards statement.

Note 1-Information in this specification is technically equivalent to related information in ISO 12086-1 and ISO 12086-2.

Document History

November 1, 2018
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
1.1 This specification2 covers polytetrafluoroethylene (PTFE) prepared by coagulation of a dispersion. These PTFE resins are homopolymers of tetrafluoroethylene or modified homopolymers containing...
May 1, 2016
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
1.1 This specification2 covers polytetrafluoroethylene (PTFE) prepared by coagulation of a dispersion. These PTFE resins are homopolymers of tetrafluoroethylene or modified homopolymers containing...
May 1, 2015
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
1.1 This specification2 covers polytetrafluoroethylene (PTFE) prepared by coagulation of the dispersion. These PTFE resins are homopolymers of tetrafluoroethylene or modified homopolymers containing...
July 1, 2010
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
1.1 This specification covers dry-powder resins of polytetrafluoroethylene (PTFE) that have been prepared from dispersions of PTFE by manufacturing techniques that involve controlled coagulation of...
February 1, 2004
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
1.1 This specification covers dry-powder resins of polytetrafluoroethylene (PTFE) that have been prepared from dispersions of PTFE by manufacturing techniques that involve controlled coagulation of...
ASTM D4895-98
November 10, 1998
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
1.1 This specification covers dry-powder resins of polytetrafluoroethylene (PTFE) that have been prepared from dispersions of PTFE by manufacturing techniques that involve controlled coagulation of...
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