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ASTM D4745-06

(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, except Types I, IV, V, and VI.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.
The following statement applies to the test method portion, Section , 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 and Note 0 for a specific warning statement.

General Information

Status
Historical
Publication Date
30-Nov-2006
ICS
83.140.99 - Other rubber and plastics products
Technical Committee
D20 - Plastics
Drafting Committee
D20.15 - Thermoplastic Materials
Current Stage
Ref Project

Relations

Replaces
ASTM D4745-01 - Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
Effective Date
01-Dec-2006
Replaced By
ASTM D4745-08 - Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
Effective Date
01-Nov-2008
Referred By
ASTM D4894-19 - Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
Effective Date
01-Dec-2006
Referred By
ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
Effective Date
01-Dec-2006

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ASTM D4745-06 - Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion MaterialsASTM D4745-06 - Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
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ASTM D4745-06 - Standard Specification for Filled Compounds of Polytetrafluoroethylene (PTFE) Molding and Extrusion Materials
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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
Designation: D 4745 – 06
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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* D 1600 Terminology for Abbreviated Terms Relating to
Plastics
1.1 This specification covers polytetrafluoroethylene
D 1895 Test Methods for Apparent Density, Bulk Factor,
(PTFE) filled molding compounds made with virgin PTFE
and Pourability of Plastic Materials
resins defined in Specification D 4894, except Types I, IV, V,
D 3892 Practice for Packaging/Packing of Plastics
and VI.
D 4894 Specification for Polytetrafluoroethylene (PTFE)
NOTE 1—This specification can be used as a model for other PTFE
Granular Molding and Ram Extrusion Materials
compounds having particulate fillers that can survive the sintering
D 5740 Guide for Writing Material Standards in the Clas-
temperatures of PTFE as can those listed in this specification. This
sification D 4000 Format
specification is restricted to virgin PTFE base resin for technical reasons.
E 11 Specification for Wire Cloth and Sieves for Testing
Recycled or reprocessed material cannot be processed successfully.
NOTE 2—The properties measured on commercially fabricated parts Purposes
may differ from the listed values for samples prepared by the procedures
E 691 Practice for Conducting an Interlaboratory Study to
given in this specification, depending on part geometry and processing
Determine the Precision of a Test Method
parameters.
IEEE/ASTM SI-10 Standard for Use of the International
NOTE 3—There is no ISO equivalent to this specification.
3
System of Units (SI): The Modern Metric System
1.2 The values stated in SI units are to be regarded as
3. Terminology
standard.
1.3 The following statement applies to the test method
3.1 Definitions—The terminology given in Terminology
portion, Section 12, of this specification: This standard does
D 883 is applicable to this specification unless otherwise
not purport to address all of the safety concerns, if any,
specified.
associated with its use. It is the responsibility of the user of this
3.2 Definitions of Terms Specific to This Standard:
standard to establish appropriate safety and health practices
3.2.1 bulk density, n—the mass in kilograms per cubic
and determine the applicability of regulatory limitations prior
metre of resin compound measured under the conditions of the
to use. See 9.5 and Note 4 for a specific warning statement.
test.
3.2.2 filled compound, n—blendofPTFEresinasthematrix
2. Referenced Documents
and particulate fillers, generally glass, other inorganic, metal-
2
2.1 ASTM Standards:
lic, or polymeric materials that withstand the sintering tem-
D 618 Practice for Conditioning Plastics for Testing
perature of PTFE (327 to 380°C).
D 638 Test Method for Tensile Properties of Plastics
3.2.3 free-flow resins (pelletized), n—generally made by
D 792 TestMethodsforDensityandSpecificGravity(Rela-
treatment of finely divided resins to produce free-flowing
tive Density) of Plastics by Displacement
agglomerates.
D 883 Terminology Relating to Plastics
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
1
This specification is under the jurisdiction of ASTM Committee D20 on
pigment is added for colorant purposes only.
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials.
3.2.6 standard flow resins (nonpelletized), n—finely divided
Current edition approved Dec. 1, 2006. Published December 2006. Originally
resin with an average particle size less than 100 µm.
approved in 1991. Last previous edition approved in 2001 as D 4745 - 01.
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 ----------------------
D4745–06
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
...

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SCOPE
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SCOPE
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1.3 This classification system and subsequent line call out specification are intended to provide a means of calling out plastic materials used in the fabrication of end items or parts. It is not intended for the selection of materials. Material selection can be made by those having expertise in the plastic field only after careful consideration of the design and performance required of the part, environment to which it will be exposed, fabrication process to be employed, costs involved, and inherent properties of the material other than those covered by this classification system.  
1.4 The values stated in SI units are to be regarded as standard.  
1.5 The following safety hazards caveat pertains only to the test method portion, Section 11, of this classification system. 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.
Note 1: There is no known ISO equivalent to this standard.  
1.6 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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ASTM
ASTM D3294-22(Specification)
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Molded Sheet and Molded Basic Shapes

ABSTRACT
This specification establishes the requirements and test methods for the material, dimensions, and workmanship, and the physical and electrical properties of molded sheet manufactured from polytetrafluoroethylene (PTFE) resin molding materials and molded basic shapes made from resin molding and extrusion materials. The sheet or molded basic shape shall be made from unpigmented PTFE and shall be free from foreign matters. Each of the samples shall undergo visual and dimensional inspection to verify their compliance with the standard requirements. The specimens shall conform to the following physical and electrical property requirements: tensile strength; elongation; dielectric strength; specific gravity; porosity; and melting point. Examination for internal defects shall also be conducted to ensure that the specimens are free from microscopic cracks, voids, inclusions, and other surface defects that might affect the serviceability of the materials.
SCOPE
1.1 This specification establishes requirements and methods of test for the material, dimensions, and workmanship, and the physical and electrical properties of molded sheet in minimum thicknesses of 0.794 mm (1/32 in.) manufactured from PTFE resin molding materials defined in Specification D4894.  
1.2 This specification also establishes requirements for molded basic shapes made from molding materials. This specification is for products 300 mm (12 in.) or less in a dimension parallel to and 12.7 mm (0.5 in.) or greater in the dimension perpendicular to the direction of the applied molding pressure.  
1.3 The values stated in SI units are to be regarded as the standard.  
1.4 The following precautionary caveat pertains only to the test method portion, Section 7, 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. Special attention is called to 13.2, 13.3, 13.6, 13.8, and A1.  
Note 1: There is no known ISO equivalent to this standard.  
1.5 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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  • Technical specification
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