Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
STANDARD published on 1.5.2019
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Designation standards: ASTM D4894-19
Publication date standards: 1.5.2019
The number of pages: 14
Approximate weight : 42 g (0.09 lbs)
Country: American technical standard
Category: Technical standards ASTM
This specification focuses on granular polytetrafluoroethylene (PTFE) resins that have never been preformed or molded, and are normally processed by methods similar to those used in powder metallurgy or ceramics, or by special extrusion processes. These PTFE resins are homopolymers of tetrafluoroethylene, or, in some cases, modified homopolymers containing not more than one percent by weight of other fluoromonomers. The materials included herein do not include mixtures of PTFE resin with additives such as colorants, fillers or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles. Included are specimen preparation, test methods and requirements for materials, melting characteristics, bulk density, particle size, water content, standard specific gravity, thermal instability index, and mechanical (tensile) properties.
Keywords:
fluoropolymers, granular polytetrafluoroethylene, polytetrafluoroethylene, PTFE,, ICS Number Code 83.080.20 (Thermoplastic materials)