ASTM D4745-08
(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 D 4894, 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.
Note 3—There is no ISO equivalent to this specification.
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 12, 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.
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Designation: D4745 – 08
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* D1600 Terminology for Abbreviated Terms Relating to
Plastics
1.1 This specification covers polytetrafluoroethylene
D3892 Practice for Packaging/Packing of Plastics
(PTFE) filled molding compounds made with virgin PTFE
D4894 Specification for Polytetrafluoroethylene (PTFE)
resins defined in Specification D4894, as Types II and III.
Granular Molding and Ram Extrusion Materials
NOTE 1—This specification can be used as a model for other PTFE
IEEE/ASTM SI-10 Standard for Use of the International
compounds having particulate fillers that can survive the sintering
3
System of Units (SI): The Modern Metric System
temperatures of PTFE as can those listed in this specification. This
specification is restricted to virgin PTFE base resin for technical reasons.
3. Terminology
Recycled or reprocessed material cannot be processed successfully.
3.1 Definitions—The terminology given in Terminology
NOTE 2—The properties measured on commercially fabricated parts
may differ from the listed values for samples prepared by the procedures D883 is applicable to this specification unless otherwise
given in this specification, depending on part geometry and processing
specified.
parameters.
3.2 Definitions of Terms Specific to This Standard:
NOTE 3—There is no ISO equivalent to this specification.
3.2.1 bulk density, n—the mass in kilograms per cubic
1.2 The values stated in SI units are to be regarded as
metre of resin compound measured under the conditions of the
standard.
test.
1.3 The following statement applies to the test method
3.2.2 filled compound, n—blendofPTFEresinasthematrix
portion, Section 12, of this specification: This standard does
and particulate fillers, generally glass, other inorganic, metal-
not purport to address all of the safety concerns, if any,
lic, or polymeric materials that withstand the sintering tem-
associated with its use. It is the responsibility of the user of this
perature of PTFE (327 to 380°C).
standard to establish appropriate safety and health practices
3.2.3 free-flow resins (pelletized), n—generally made by
and determine the applicability of regulatory limitations prior
treatment of finely divided resins to produce free-flowing
to use. See Note 5 for a specific warning statement.
agglomerates.
3.2.4 lot, n—one production run or a uniform blend of two
2. Referenced Documents
or more production runs.
2
2.1 ASTM Standards:
3.2.5 pigmented compound, n—a compound in which a
D618 Practice for Conditioning Plastics for Testing
pigment is added for colorant purposes only.
D638 Test Method for Tensile Properties of Plastics
3.2.6 standard flow resins (nonpelletized), n—finely divided
D792 Test Methods for Density and Specific Gravity (Rela-
resin with an average particle size less than 100 µm.
tive Density) of Plastics by Displacement
3.3 Abbreviations—Abbreviations are in accordance with
D883 Terminology Relating to Plastics
Terminology D1600. PTFE is the acronym for polytetrafluo-
roethylene.
4. Classification
1
This specification is under the jurisdiction of ASTM Committee D20 on
4.1 This specification covers the following two types of
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials.
PTFE compounds:
Current edition approved Nov. 1, 2008. Published December 2008. Originally
4.1.1 Type I—Standard flow resins (nonpelletized) material,
approved in 1991. Last previous edition approved in 2006 as D4745 - 06. DOI:
for general-purpose compression molding.
10.1520/D4745-08.
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 – 08
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
...
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:D4745–06 Designation: D 4745 – 08
Standard Specification for
Filled Compounds of Polytetrafluoroethylene (PTFE)
1
Molding and Extrusion Materials
This standard is issued under the fixed designation D 4745; 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 D 4894, except Types I, IV, V, and VI. , 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.
NOTE 3—There is no ISO equivalent to this specification.
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 12, 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 9.5 and Note
4 See Note 5 for a specific warning statement.
2. Referenced Documents
2
2.1 ASTM Standards:
D 618 Practice for Conditioning Plastics for Testing
D 638 Test Method for Tensile Properties of Plastics
D 792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D 883 Terminology Relating to Plastics
D 1600 Terminology for Abbreviated Terms Relating to Plastics D1895Test Methods for Apparent Density, Bulk Factor, and
Pourability of Plastic Materials
D 3892 Practice for Packaging/Packing of Plastics
D 4894 Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
D5740Guide for Writing Material Standards in the Classification D 4000 Format
E11Specification for Wire Cloth and Sieves for Testing Purposes
E691Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
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 D 883 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.
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 Dec.Nov. 1, 2006.2008. Published December 2006.2008. Originally approved in 1991. Last previous edition approved in 20012006 as
D 4745 - 016.
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 ----------------------
D4745–08
3.2.4 lot, n—one production run or a uniform blend of two or more production runs.
3.2.5 pigmented compound, n—a compound in which a pigment is added for colorant purposes only.
3.2.6 standard flow resi
...
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