ASTM D4745-19
(Specification)Standard Classification System and Basis for Specification for Filled Polytetrafluoroethlyene (PTFE) Molding and Extrusion Materials Using ASTM Methods
Standard Classification System and Basis for Specification for Filled Polytetrafluoroethlyene (PTFE) Molding and Extrusion Materials Using ASTM Methods
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 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.
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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.
Designation:D4745 −19
Standard Classification System and Basis for Specification for
Filled Polytetrafluoroethlyene (PTFE) Molding and Extrusion
1
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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
1.1 This standard classification system and basis for speci- 2.1 ASTM Standards:
fication covers polytetrafluoroethylene (PTFE) filled molding D792Test Methods for Density and Specific Gravity (Rela-
compounds made with virgin PTFE resins defined in Specifi- tive Density) of Plastics by Displacement
cation D4894, as Types II and III. D883Terminology Relating to Plastics
D1600TerminologyforAbbreviatedTermsRelatingtoPlas-
NOTE 1—This system can be used as a model for other PTFE
tics
compounds having particulate fillers that can survive the sintering
D1708TestMethodforTensilePropertiesofPlasticsbyUse
temperatures of PTFE as can those listed in this standard. This system is
restricted to virgin PTFE base resin for technical reasons. Recycled or
of Microtensile Specimens
reprocessed material cannot be processed successfully.
D3892Practice for Packaging/Packing of Plastics
NOTE 2—The properties measured on commercially fabricated parts
D4894 Specification for Polytetrafluoroethylene (PTFE)
may differ from the listed values for samples prepared by the procedures
Granular Molding and Ram Extrusion Materials
given in this specification, depending on part geometry and processing
parameters. Compounds used for ram extrusion are made from resins that IEEE/ASTM SI-10Standard for Use of the International
3
comply with ASTM-D4745 Type II prior to their pre-sintering process.
System of Units (SI): The Modern Metric System
Property values measured on extruded products will vary from the listed
valuesforTypeIIcompoundswhicharepreparedbytheproceduresgiven
3. Terminology
below which standardize mold diameter and sintering cycle. End users
shouldassesstheseexpectedvariationsinramextrudedproductstoensure 3.1 Definitions—The terminology given in Terminology
their suitable use in their specific application.
D883 is applicable to this specification unless otherwise
specified.
1.2 The values stated in SI units are to be regarded as
standard.
3.2 Definitions of Terms Specific to This Standard:
1.3 The following statement applies to the test method
3.2.1 bulk density, n—the mass in kilograms per cubic liter
portion, Section 11, of this specification: This standard does of resin compound measured under the conditions of the test.
not purport to address all of the safety concerns, if any,
3.2.2 filled compound, n—blendofPTFEresinasthematrix
associated with its use. It is the responsibility of the user of this
and particulate fillers, generally glass, other inorganic,
standard to establish appropriate safety, health, and environ-
metallic, or polymeric materials that withstand the sintering
mental practices and determine the applicability of regulatory
temperature of PTFE (327 to 380°C).
limitations prior to use. See Note 5 for a specific warning
3.2.3 free-flow resins (pelletized), n—generally made by
statement.
treatment of finely divided resins to produce free-flowing
NOTE 3—There is no known ISO equivalent to this standard.
agglomerates.
1.4 This international standard was developed in accor-
3.2.4 lot, n—one production run.
dance with internationally recognized principles on standard-
3.2.5 pigmented compound, n—a compound in which a
ization established in the Decision on Principles for the
pigment is added for colorant purposes only.
Development of International Standards, Guides and Recom-
3.2.6 standard flow resins (nonpelletized), n—finely divided
mendations issued by the World Trade Organization Technical
resin with an average particle size less than 100 µm.
Barriers to Trade (TBT) Committee.
1 2
This specification is under the jurisdiction of ASTM Committee D20 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Materials. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved May 1, 2019. Published June 2019. Originally the ASTM website.
3
approved in 1991. Last previous edition approved in 2014 as D4745-14. DOI: Available from ASTM International Headquarter
...
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 − 14 D4745 − 19
Standard Classification System and Basis for Specification for
Filled Polytetrafluoroethlyene (PTFE) Molding and Extrusion
1
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.
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 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 safety, health, and healthenvironmental 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.
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 metreliter of resin compound measured under the conditions of the test.
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 Aug. 1, 2014May 1, 2019. Published September 2014June 2019. Originally approved in 1991. Last previous edition approved in 20122014 as
ε01
D4745 - 11aD4745 - 14. . DOI: 10.1520/D4745-14.10.1520/D4745-19.
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 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
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D4745 − 19
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