ASTM D4894-04

Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials

SCOPE
1.1 This specification covers granular resins and test methods for polytetrafluoroethylene (PTFE) that have never been preformed or molded and are normally processed by methods similar to those used in powder metallurgy or ceramics, or by special extrusion processes. These PTFE resins are homopolymers of tetrafluoroethylene, or, in some cases, modified homopolymers containing not more than one percent by weight of other fluoromonomers. The usual methods of processing thermoplastics generally are not applicable to these materials because of their viscoelastic properties at processing temperatures. The materials included herein do not include mixtures of PTFE resin with additives such as colorants, fillers or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles. The methods and properties included are those required to identify the various types of resins. Additional procedures are provided in the Appendix for further characterization of the resins.
1.2 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as the standard, and the practices of IEEE/ASTM SI-10 are incorporated herein.
1.3 The following precautionary caveat pertains only to the Specimen Preparation section, Section ,9 and the Test Methods section, Section , of this specification: This specification 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 Notes 3 and 9 for specific cautionary statements.
Note 1—Information in this specification is technically equivalent to related information in ISO 12086-1 and ISO 12086-2.

General Information

• Status: Historical
• Publication Date: 31-Jan-2004
• ICS: 83.080.20 - Thermoplastic materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

Relations

• Replaces: ASTM D4894-98a - Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• Effective Date: 01-Feb-2004
• Replaced By: ASTM D4894-07 - Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• Effective Date: 01-Sep-2007
• Referred By: ASTM D3295-20 - Standard Specification for PTFE Tubing, Miniature Beading and Spiral Cut Tubing
• Effective Date: 01-Feb-2004
• Referred By: ASTM D4745-19 - Standard Classification System and Basis for Specification for Filled Polytetrafluoroethlyene (PTFE) Molding and Extrusion Materials Using ASTM Methods
• Effective Date: 01-Feb-2004
• Referred By: ASTM D4000-23 - Standard Classification System for Specifying Plastic Materials
• Effective Date: 01-Feb-2004
• Referred By: ASTM F754-08(2015) - Standard Specification for Implantable Polytetrafluoroethylene (PTFE) Sheet, Tube, and Rod Shapes Fabricated from Granular Molding Powders
• Effective Date: 01-Feb-2004
• Referred By: ASTM F1545-15a(2021) - Standard Specification for Plastic-Lined Ferrous Metal Pipe, Fittings, and Flanges
• Effective Date: 01-Feb-2004
• Referred By: ASTM D3294-22 - Standard Specification for Polytetrafluoroethylene (PTFE) Resin Molded Sheet and Molded Basic Shapes
• Effective Date: 01-Feb-2004
• Referred By: ASTM G74-13(2021) - Standard Test Method for Ignition Sensitivity of Nonmetallic Materials and Components by Gaseous Fluid Impact
• Effective Date: 01-Feb-2004
• Referred By: ASTM D3308-12(2022) - Standard Specification for PTFE Resin Skived Tape
• Effective Date: 01-Feb-2004
• Referred By: ASTM D4441-20 - Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
• Effective Date: 01-Feb-2004
• Referred By: ASTM D1710-15(2021) - Standard Specification for Extruded Polytetrafluoroethylene (PTFE) Rod, Heavy Walled Tubing and Basic Shapes
• Effective Date: 01-Feb-2004
• Referred By: ASTM D6867-19 - Standard Specification for Perfluoroalkoxy (PFA)-Fluoropolymer Tubing
• Effective Date: 01-Feb-2004
• Referred By: ASTM D4591-22 - Standard Test Method for Determining Temperatures and Heats of Transitions of Fluoropolymers by Differential Scanning Calorimetry
• Effective Date: 01-Feb-2004
• Referred By: ASTM D8507-23 - Standard Specification for High Load Multi-Rotational Disc Bearings for Bridges and Structures
• Effective Date: 01-Feb-2004

Standards Content (Sample)

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 4894 – 04
Standard Specification for
Polytetrafluoroethylene (PTFE) Granular Molding and Ram
1
Extrusion Materials
This standard is issued under the fixed designation D 4894; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* 2. Referenced Documents
2
1.1 This specification covers granular resins and test meth- 2.1 ASTM Standards:
ods for polytetrafluoroethylene (PTFE) that have never been D618 Practice for Conditioning Plastics for Testing
preformed or molded and are normally processed by methods D638 Test Method for Tensile Properties of Plastics
similar to those used in powder metallurgy or ceramics, or by D792 Test Methods for Density Specific Gravity (Relative
special extrusion processes. These PTFE resins are homopoly- Density) and Density of Plastics by Displacement
mers of tetrafluoroethylene, or, in some cases, modified ho- D883 Terminology Relating to Plastics
mopolymerscontainingnotmorethanonepercentbyweightof D1895 Test Methods for Apparent Density, Bulk Factor,
other fluoromonomers. The usual methods of processing ther- and Pourability of Plastic Materials
moplastics generally are not applicable to these materials D3295 Specification for PTFE Tubing
because of their viscoelastic properties at processing tempera- D3892 Practice for Packaging/Packing of Plastics
tures.Thematerialsincludedhereindonotincludemixturesof D4441 Specification for Aqueous Dispersions of Polytet-
PTFE resin with additives such as colorants, fillers or plasti- rafluoroethylene
cizers;nordotheyincludereprocessedorregroundresinorany D4591 Test Method for Determining Temperatures and
fabricated articles. The methods and properties included are Heats of Transitions of Fluoropolymers by Differential
those required to identify the various types of resins. Addi- Scanning Calorimetry
tional procedures are provided in the Appendix for further D4745 Specification for Filled Compounds of Polytet-
characterization of the resins. rafluoroethylene (PTFE) Molding and Extrusion Materials
1.2 The values stated in SI units as detailed in IEEE/ASTM D4895 Specification for Polytetrafluoroethylene (PTFE)
SI-10 are to be regarded as the standard, and the practices of Resins Produced From Dispersion
IEEE/ASTM SI-10 are incorporated herein. E11 Specification for Wire-Cloth Sieves for Testing Pur-
1.3 The following precautionary caveat pertains only to the poses
SpecimenPreparationsection,Section9,andtheTestMethods E177 Practice for Use of the Terms Precision and Bias in
section, Section 10, of this specification: This specification ASTM Test Methods
does not purport to address all of the safety concerns, if any, IEEE/ASTM SI–10 Standard for Use of the International
associated with its use. It is the responsibility of the user of this System of Units (SI): The Modern Metric System
standard to establish appropriate safety and health practices 2.2 ISO Standards:
and determine the applicability of regulatory limitations prior ISO 12086-1 Plastics—Fluoropolymer Dispersions and
to use. See Notes 3 and 9 for specific cautionary statements. Moulding and Extrusion Materials—Part 1: Designation
3
System and Basis for Specification
NOTE 1—Information in this specification is technically equivalent to
3
ISO 12086-2 Test Methods for Fluoropolymers
related information in ISO12086-1 and ISO12086-2.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This specification is under the jurisdiction of ASTM Committee D20 on contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic Standards volume information, refer to the standard’s Document Summary page on
Materials. the ASTM website.
3
Current edition approved Feb. 1, 2004. Published March 2004. Originally Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
approved in 1989. Last previous edition approved in 1998 as D4894-98a. 4th Floor, New York, NY 10036.
*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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D 4894 – 04
A
TABLE 1 Detail Requirements for Tests on Resins
Melting Peak Temperature
Particle Size, Average Diameter,
Type Grade Bulk Density, g/L Water Content, max, %
µm
Initial °C Second °C
A
I 1 700 6 100 500 6 150 0.04 327 6 10
A
2 675 6 50 375 6 75 0.04 327 6 10
A
II . . . . . . <100 0.04 327 6 10
A
III 1 400 6 125 <100 0.04 327 6 10
2 850 6 50 500 6 100 0.04 335 3
...