ASTM D4895-15
(Specification)Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
ABSTRACT
This specification covers dry-powder resins of polytetrafluoroethylene (PTFE) resin produced from dispersion. PTFE mixtures with additives are not covered in this specification. This specification covers type I and type II PTFE. The resins shall be tested for bulk density, particle size, water content, melting peak temperature, tensile strength, elongation at break, standard specific gravity, extrusion pressure, thermal instability index, and stretching void index. Specimen preparation, testing, inspection, and packaging shall be in accordance to the procedures indicated in this specification.
SCOPE
1.1 This specification2 covers polytetrafluoroethylene (PTFE) prepared by coagulation of the dispersion. These PTFE resins are homopolymers of tetrafluoroethylene or modified homopolymers containing not more than 1 % by weight of other fluoromonomers. The materials covered herein do not include mixtures of PTFE with additives such as colors, fillers, or plasticizers; nor do they include reprocessed or reground resin or any fabricated articles because the properties of such materials have been irreversibly changed when they were fibrillated or sintered.
1.2 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as standard. The values given in parentheses are for information only.
1.3 The following safety hazards caveat pertains only to the Specimen Preparation Section, Section 9, and the Test Methods Section, Section 10, 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 Warning note in 9.1.1 for a specific hazards statement.
Note 1: Information in this specification is technically equivalent to related information in ISO 12086-1 and ISO 12086-2.
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Designation:D4895 −15
StandardSpecification for
Polytetrafluoroethylene (PTFE) Resin Produced From
1
Dispersion
This standard is issued under the fixed designation D4895; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* D638 Test Method for Tensile Properties of Plastics
2 D792 Test Methods for Density and Specific Gravity (Rela-
1.1 This specification covers polytetrafluoroethylene
tive Density) of Plastics by Displacement
(PTFE)preparedbycoagulationofthedispersion.ThesePTFE
D883 Terminology Relating to Plastics
resins are homopolymers of tetrafluoroethylene or modified
D1895 Test Methods forApparent Density, Bulk Factor, and
homopolymers containing not more than 1 % by weight of
Pourability of Plastic Materials
other fluoromonomers. The materials covered herein do not
D3892 Practice for Packaging/Packing of Plastics
include mixtures of PTFE with additives such as colors, fillers,
D4052 Test Method for Density, Relative Density, and API
or plasticizers; nor do they include reprocessed or reground
Gravity of Liquids by Digital Density Meter
resin or any fabricated articles because the properties of such
D4441 Specification for Aqueous Dispersions of Polytetra-
materials have been irreversibly changed when they were
fluoroethylene
fibrillated or sintered.
D4591 Test Method for Determining Temperatures and
1.2 The values stated in SI units as detailed in IEEE/ASTM
Heats of Transitions of Fluoropolymers by Differential
SI-10 are to be regarded as standard. The values given in
Scanning Calorimetry
parentheses are for information only.
D4894 Specification for Polytetrafluoroethylene (PTFE)
Granular Molding and Ram Extrusion Materials
1.3 The following safety hazards caveat pertains only to the
SpecimenPreparationSection,Section9,andtheTestMethods E11 Specification for Woven Wire Test Sieve Cloth and Test
Sieves
Section, Section 10, of this specification: This standard does
not purport to address all of the safety concerns, if any, E29 Practice for Using Significant Digits in Test Data to
associated with its use. It is the responsibility of the user of this Determine Conformance with Specifications
E177 Practice for Use of the Terms Precision and Bias in
standard to establish appropriate safety and health practices
and determine the applicability of regulatory limitations prior ASTM Test Methods
IEEE/ASTM SI-10 Use of the International System of Units
to use. See Warning note in 9.1.1 for a specific hazards
statement. (SI): The Modern Metric System
4
2.2 ISO Standards:
NOTE 1—Information in this specification is technically equivalent to
ISO 12086-1 Plastics Fluoropolymer Dispersions and Mold-
related information in ISO 12086-1 and ISO 12086-2.
ing and Extrusion Materials—Part 1: Designation and
2. Referenced Documents Specification
3 ISO 12086-2 Plastics Fluoropolymer Dispersions and
2.1 ASTM Standards:
Molding and Extrusion Materials—Part 2: Preparation of
D618 Practice for Conditioning Plastics for Testing
Test Specimens and Determination of Properties
ISO 13322-2 Particle size analysis—Image analysis
1
This specification is under the jurisdiction of ASTM Committee D20 on methods—Part 2: Dynamic image analysis methods
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
Materials.
3. Terminology
Current edition approved May 1, 2015. Published June 2015. Originally
3.1 Definitions—The definitions given in Terminology
approved in 1989. Last previous edition approved in 2010 as D4895 - 10. DOI:
10.1520/D4895-15.
D883 are applicable to this specification.
2
Specifications for other forms of polytetrafluoroethylene are found in Specifi-
3.2 Definitions of Terms Specific to This Standard:
cations D4441 and D4894.
3
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
4
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*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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D4895−15
3.2.1 bulk density, n—the mass in grams per litre of resin accordance with standard specific gravity (SSG), Thermal
measured under the conditions of the test. Stability Index (TII), and Stre
...
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: D4895 − 10 D4895 − 15
Standard Specification for
Polytetrafluoroethylene (PTFE) Resin Produced From
1
Dispersion
This standard is issued under the fixed designation D4895; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
2
1.1 This specification covers dry-powder resins of polytetrafluoroethylene (PTFE) that have been prepared from dispersions
of PTFE by manufacturing techniques that involve controlled prepared by coagulation of the dispersion. These resins are generally
known as “fine-powder” resins or “coagulated-dispersion powder” resins. The conversion of these resins to finished products
normally involves a process called “paste extrusion,” and sometimes involves formative processes such as calendering. A volatile
liquid is present as a processing aid during these formative stages of conversion, and is subsequently removed during the finishing
stages of conversion. These PTFE resins are homopolymers of tetrafluoroethylene, or, in some cases, tetrafluoroethylene or
modified homopolymers containing not more than 1 % by weight of other fluoromonomers. The usual methods of processing
thermoplastics generally are not applicable to these materials because of their viscoelastic properties. The materials materials
covered herein do not include mixtures of PTFE with additives such as colors, fillers, or plasticizers; nor do they include
reprocessed or reground resin or any fabricated articles because the properties of such materials have been irreversibly changed
when they were fibrillated or sintered. The methods and properties included are those required to identify the various resins. An
additional procedure is 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 standard. The values given in
parentheses are for information only.
1.3 The following safety hazards caveat pertains only to the Specimen Preparation Section, Section 9, and the Test Methods
Section, Section 10, 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 Warning note in 9.1.1 for a specific hazards statement.
NOTE 1—Information in this specification is technically equivalent to related information in ISO 12086-1 and ISO 12086-2.
2. Referenced Documents
3
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D638 Test Method for Tensile Properties of Plastics
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
D1895 Test Methods for Apparent Density, Bulk Factor, and Pourability of Plastic Materials
D3892 Practice for Packaging/Packing of Plastics
D4052 Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter
D4441 Specification for Aqueous Dispersions of Polytetrafluoroethylene
D4591 Test Method for Determining Temperatures and Heats of Transitions of Fluoropolymers by Differential Scanning
Calorimetry
D4894 Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
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 July 1, 2010May 1, 2015. Published August 2010June 2015. Originally approved in 1989. Last previous edition approved in 20042010 as
D4895 - 04.D4895 - 10. DOI: 10.1520/D4895-10.10.1520/D4895-15.
2
Specifications for other forms of polytetrafluoroethylene are found in Specifications D4441 and D4894.
3
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.
*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
...
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