ASTM D4745-11ae1

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
´1
Designation:D4745 −11a
StandardSpecification 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.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1
´ NOTE—Editorially corrected the text in Fig. 2 in January 2012.
1. Scope* D1708TestMethodforTensilePropertiesofPlasticsbyUse
of Microtensile Specimens
1.1 This specification covers polytetrafluoroethylene
D3892Practice 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-10Standard 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.
NOTE 2—The properties measured on commercially fabricated parts
3.1 Definitions—The terminology given in Terminology
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:
1.2 The values stated in SI units are to be regarded as
3.2.1 bulk density, n—themassinkilogramspercubicmetre
standard.
of resin compound measured under the conditions of the test.
1.3 The following statement applies to the test method
3.2.2 filled compound, n—blendofPTFEresinasthematrix
portion, Section 11, of this specification: This standard does
and particulate fillers, generally glass, other inorganic,
not purport to address all of the safety concerns, if any,
metallic, or polymeric materials that withstand the sintering
associated with its use. It is the responsibility of the user of this
temperature of PTFE (327 to 380°C).
standard to establish appropriate safety and health practices
and determine the applicability of regulatory limitations prior 3.2.3 free-flow resins (pelletized), n—generally made by
to use. See Note 5 for a specific warning statement. treatment of finely divided resins to produce free-flowing
agglomerates.
NOTE 3—There is no known ISO equivalent to this standard.
3.2.4 lot, n—one production run.
2. Referenced Documents
3.2.5 pigmented compound, n—a compound in which a
2
2.1 ASTM Standards: pigment is added for colorant purposes only.
D792Test Methods for Density and Specific Gravity (Rela-
3.2.6 standard flow resins (nonpelletized), n—finely divided
tive Density) of Plastics by Displacement
resin with an average particle size less than 100 µm.
D883Terminology Relating to Plastics
3.3 Abbreviations—Abbreviations are in accordance with
D1600TerminologyforAbbreviatedTermsRelatingtoPlas-
Terminology D1600. PTFE is the acronym for polytetrafluo-
tics
roethylene.
4. Classification
1
This specification is under the jurisdiction of ASTM Committee D20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
4.1 This specification covers the following two types of
Materials.
PTFE compounds:
Current edition approved Dec. 1, 2011. Published December 2011. Originally
4.1.1 Type I—Standard flow resins (nonpelletized) material,
approved in 1991. Last previous edition approved in 2011 as D4745-11. DOI:
10.1520/D4745-11A.
for general-purpose compression molding.
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

---------------------- Page: 1 ----------------------
´1
D4745−11a
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 2.25
...