ASTM D4745-14

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Designation: D4745 − 11a D4745 − 14
Standard Classification System and Basis for Specification for
Filled Compounds of Polytetrafluoroethylene
Polytetrafluoroethlyene (PTFE) Molding and Extrusion
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Materials Using ASTM Methods
This standard is issued under the fixed designation D4745; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
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ε NOTE—Editorially corrected the text in Fig. 2 in January 2012.
1. 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 specificationsystem 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 specification.standard. This specificationsystem 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.
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 and health 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.
2. Referenced Documents
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2.1 ASTM Standards:
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to Plastics
D1708 Test Method for Tensile Properties of Plastics by Use of Microtensile Specimens
D3892 Practice for Packaging/Packing of Plastics
D4894 Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
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IEEE/ASTM SI-10 Standard for Use of the International System of Units (SI): The Modern Metric System
3. Terminology
3.1 Definitions—The terminology given in Terminology D883 is applicable to this specification unless otherwise specified.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 bulk density, n—the mass in kilograms per cubic metre of resin compound measured under the conditions of the test.
3.2.2 filled compound, n—blend of PTFE resin as the matrix and particulate fillers, generally glass, other inorganic, metallic,
or polymeric materials that withstand the sintering temperature of PTFE (327 to 380°C).
3.2.3 free-flow resins (pelletized), n—generally made by treatment of finely divided resins to produce free-flowing agglomerates.
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This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Materials.
Current edition approved Dec. 1, 2011Aug. 1, 2014. Published December 2011September 2014. Originally approved in 1991. Last previous edition approved in 20112012
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as D4745 - 11.D4745 - 11a . DOI: 10.1520/D4745-11A.10.1520/D4745-14.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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Available from ASTM International Headquarters, 100 Barr Harbor Drive, West Conshohocken, PA 19428
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D4745 − 14
TABLE 1 TFE Compounds, Type I, Standard Flow (Nonpelletized)
Molded Parts (Molded and Sintered)
Raw Resin
Specific Gravity, Specific Gravity,
Grade Bulk Density, Tensile Strength
Elongation, min,
min max
min, g/L
%
min, MPa min, psi
1 15 % glass fiber 400 2.150 2.250 19.6 2840 220
2 25 % glass fiber 425 2.150 2.250 15.7 2270 180
3 35 % gla
...