ASTM D4745-11a
(Specification)Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
ABSTRACT
This specification covers polytetrafluoroethylene(PTFE) filled molding compounds made with virgin PTFE resins defined in a certain specification except Types I, IV, V, and VI. PTFE compounds are classified into two types which are Type I as the nonpelletized material use for general purpose compression molding and Type II as the pelletized or free-flowing material use for molding, automatic molding or ram extrusion. Each type is further classified into thirteen grades distinguished by the nature of the filler. Different tests shall be conducted in order to determine the following properties: filler content, bulk density, specific gravity, and tensile properties.
SCOPE
1.1 This specification covers polytetrafluoroethylene (PTFE) filled molding compounds made with virgin PTFE resins defined in Specification D4894, as Types II and III.
Note 1—This specification 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. This specification 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.
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Designation: D4745 – 11a
Standard Specification for
Filled Compounds of Polytetrafluoroethylene (PTFE)
1
Molding and Extrusion Materials
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.
1. Scope* D3892 Practice for Packaging/Packing of Plastics
D4894 Specification for Polytetrafluoroethylene (PTFE)
1.1 This specification covers polytetrafluoroethylene
Granular Molding and Ram Extrusion Materials
(PTFE) filled molding compounds made with virgin PTFE
IEEE/ASTM SI-10 Standard for Use of the International
resins defined in Specification D4894, as Types II and III.
3
System of Units (SI): The Modern Metric System
NOTE 1—This specification can be used as a model for other PTFE
compounds having particulate fillers that can survive the sintering
3. Terminology
temperatures of PTFE as can those listed in this specification. This
3.1 Definitions—The terminology given in Terminology
specification is restricted to virgin PTFE base resin for technical reasons.
D883 is applicable to this specification unless otherwise
Recycled or reprocessed material cannot be processed successfully.
specified.
NOTE 2—The properties measured on commercially fabricated parts
may differ from the listed values for samples prepared by the procedures 3.2 Definitions of Terms Specific to This Standard:
given in this specification, depending on part geometry and processing
3.2.1 bulk density, n—the mass in kilograms per cubic
parameters.
metre of resin compound measured under the conditions of the
1.2 The values stated in SI units are to be regarded as test.
standard. 3.2.2 filled compound, n—blendofPTFEresinasthematrix
1.3 The following statement applies to the test method and particulate fillers, generally glass, other inorganic, metal-
portion, Section 11, of this specification: This standard does lic, or polymeric materials that withstand the sintering tem-
not purport to address all of the safety concerns, if any, perature of PTFE (327 to 380°C).
associated with its use. It is the responsibility of the user of this 3.2.3 free-flow resins (pelletized), n—generally made by
standard to establish appropriate safety and health practices treatment of finely divided resins to produce free-flowing
and determine the applicability of regulatory limitations prior agglomerates.
to use. See Note 5 for a specific warning statement. 3.2.4 lot, n—one production run.
3.2.5 pigmented compound, n—a compound in which a
NOTE 3—There is no known ISO equivalent to this standard.
pigment is added for colorant purposes only.
3.2.6 standard flow resins (nonpelletized), n—finely divided
2. Referenced Documents
resin with an average particle size less than 100 µm.
2
2.1 ASTM Standards:
3.3 Abbreviations—Abbreviations are in accordance with
D792 Test Methods for Density and Specific Gravity (Rela-
Terminology D1600. PTFE is the acronym for polytetrafluo-
tive Density) of Plastics by Displacement
roethylene.
D883 Terminology Relating to Plastics
D1600 Terminology for Abbreviated Terms Relating to
4. Classification
Plastics
4.1 This specification covers the following two types of
D1708 Test Method for Tensile Properties of Plastics by
PTFE compounds:
Use of Microtensile Specimens
4.1.1 Type I—Standard flow resins (nonpelletized) material,
for general-purpose compression molding.
1
This specification is under the jurisdiction of ASTM Committee D20 on
4.1.2 Type II—Free-flow resins (pelletized) material, for
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
compression molding, automatic molding, or ram extrusion.
Materials.
4.2 Grades of each type distinguished by the nature of the
Current edition approved Dec. 1, 2011. Published December 2011. Originally
filler(s) are listed in Tables 1-3.
approved in 1991. Last previous edition approved in 2011 as D4745 - 11. DOI:
10.1520/D4745-11A.
2
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from ASTM International Headquarters, 100 Barr Harbor Drive,
the ASTM website. 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.
1
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D4745 – 11a
TABLE 1 TFE Compounds, Type I, Standard Flow (Nonpelletized)
Molded Parts (Molded and Sintered)
Raw Resin
Specific Gravity, Specific Grav
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D4745–11 Designation: D4745 – 11a
Standard Specification for
Filled Compounds of Polytetrafluoroethylene (PTFE)
1
Molding and Extrusion Materials
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.
1. Scope*
1.1 This specification covers polytetrafluoroethylene (PTFE) filled molding compounds made with virgin PTFE resins defined
in Specification D4894, as Types II and III.
NOTE 1—This specification 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. This specification 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
2
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
3
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.
3.2.4 lot, n—one production run.
3.2.5 pigmented compound, n—a compound in which a pigment is added for colorant purposes only.
3.2.6 standard flow resins (nonpelletized), n—finely divided resin with an average particle size less than 100 µm.
3.3 Abbreviations—Abbreviations are in accordance with Terminology D1600. PTFE is the acronym for polytetrafluoroethyl-
ene.
1
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 Feb.Dec. 1, 2011. Published MarchDecember 2011. Originally approved in 1991. Last previous edition approved in 20082011 as
D4745-08.D4745 - 11. DOI: 10.1520/D4745-11A.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
3
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.
1
---------------------- Page: 1 ----------------------
D4745 – 11a
4. Classification
4.1 This specification covers the following two types of PTFE compounds:
4.1.1 Type I—Standard flow resins (nonpelletized) material, for general-purpose compression molding.
4.1.2 Type II—Free-flow re
...
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