ASTM D4745-19
Standard Classification System and Basis for Specification for Filled Polytetrafluoroethlyene (PTFE) Molding and Extrusion Materials Using ASTM Methods

Standard No.

ASTM D4745-19

Release Date

2019

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D4745-19

Scope

1.1 This standard classification system and basis for specification covers polytetrafluoroethylene (PTFE) filled molding compounds made with virgin PTFE resins defined in Specification D4894, as Types II and III. NOTE 1—This system can be used as a model for other PTFE compounds having particulate fillers that can survive the sintering temperatures of PTFE as can those listed in this standard. This system is restricted to virgin PTFE base resin for technical reasons. Recycled or reprocessed material cannot be processed successfully. NOTE 2—The properties measured on commercially fabricated parts may differ from the listed values for samples prepared by the procedures given in this specification, depending on part geometry and processing parameters. Compounds used for ram extrusion are made from resins that comply with ASTM-D4745 Type II prior to their pre-sintering process. Property values measured on extruded products will vary from the listed values for Type II compounds which are prepared by the procedures given below which standardize mold diameter and sintering cycle. End users should assess these expected variations in ram extruded products to ensure their suitable use in their specific application. 1.2 The values stated in SI units are to be regarded as standard. 1.3 The following statement applies to the test method portion, Section 11, 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. See Note 5 for a specific warning statement. NOTE 3—There is no known ISO equivalent to this standard. 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 D4745-19 Referenced Document

• ASTM D1600 Standard Terminology for Abbreviated Terms Relating to Plastics
• ASTM D1708 Standard Test Method for Tensile Properties of Plastics By Use of Microtensile Specimens
• ASTM D3892 Standard Practice for Packaging/Packing of Plastics
• ASTM D4894 Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• ASTM D792 Standard Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
• ASTM D883 Standard Terminology Relating to Plastics*， 2024-02-01 Update
• IEEE/ASTM SI 10 American National Standard for Metric Practice

ASTM D4745-19 history

• 2019 ASTM D4745-19 Standard Classification System and Basis for Specification for Filled Polytetrafluoroethlyene (PTFE) Molding and Extrusion Materials Using ASTM Methods
• 2014 ASTM D4745-14 Standard Classification System and Basis for Specification for Filled Polytetrafluoroethlyene &40;PTFE&41; Molding and Extrusion Materials Using ASTM Methods
• 2011 ASTM D4745-11ae1 Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
• 2011 ASTM D4745-11a Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
• 2011 ASTM D4745-11 Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
• 2008 ASTM D4745-08 Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
• 2006 ASTM D4745-06 Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
• 2001 ASTM D4745-01 Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
• 1997 ASTM D4745-97 Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials