ASTM D4894-19
Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials

Standard No.

ASTM D4894-19

Release Date

2019

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D4894-19

Scope

1.1 This specification covers granular resins and test methods for polytetrafluoroethylene (PTFE) 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 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 or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles. The methods and properties included are those required to identify the various types of resins. Additional procedures are provided in the Appendix for further characterization of the resins. 1.2 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as the standard, and the practices of IEEE/ASTM SI-10 are incorporated herein. 1.3 The following precautionary caveat pertains only to the Specimen Preparation section, Section 9, and the Test Methods section, Section 10, of this specification: This specification 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 Notes 3 and 9 for specific cautionary statements. NOTE 1—Information in this specification is technically equivalent to related information in ISO 12086-1 and ISO 12086-2. 1.4 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 issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

ASTM D4894-19 Referenced Document

• ASTM D1708 Standard Test Method for Tensile Properties of Plastics By Use of Microtensile Specimens
• ASTM D1895 Standard Test Methods for Apparent Density, Bulk Factor, and Pourability of Plastic Materials
• ASTM D3295 Standard Specification for PTFE Tubing, Miniature Beading and Spiral Cut Tubing
• ASTM D3892 Standard Practice for Packaging/Packing of Plastics
• ASTM D4441 Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
• ASTM D4591 Standard Test Method for Determining Temperatures and Heats of Transitions of Fluoropolymers by Differential Scanning Calorimetry
• ASTM D4745 Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
• ASTM D4895 Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
• ASTM D618 Standard Practice for Conditioning Plastics for Testing
• ASTM D792 Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
• ASTM D883 Standard Terminology Relating to Plastics
• ASTM E11 Standard Specification for Wire Cloth and Sieves for Testing Purposes
• ASTM E177 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
• IEEE/ASTM SI 10 American National Standard for Metric Practice
• ISO 12086-1 Plastics - Fluoropolymer dispersions and moulding and extrusion materials - Part 1: Designation system and basis for specifications; Technical Corrigendum 1
• ISO 12086-2 Plastics - Fluoropolymer dispersions and moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties; Technical Corrigendum 1

ASTM D4894-19 history

• 2019 ASTM D4894-19 Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• 2015 ASTM D4894-15 Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• 2007 ASTM D4894-07(2012) Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• 2007 ASTM D4894-07 Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• 2004 ASTM D4894-04 Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• 1998 ASTM D4894-98a Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials