ASTM D4895-18

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 a 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 20568-1 and ISO 20568-2.  
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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2018
• ICS: 83.080.10 - Thermosetting materials
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.15 - Thermoplastic Materials

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: D4895 − 18
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. Referenced Documents
2 3
2.1 ASTM Standards:
1.1 This specification covers polytetrafluoroethylene
D618 Practice for Conditioning Plastics for Testing
(PTFE) prepared by coagulation of a dispersion. These PTFE
resins are homopolymers of tetrafluoroethylene or modified D638 Test Method for Tensile Properties of Plastics
D792 Test Methods for Density and Specific Gravity (Rela-
homopolymers containing not more than 1 % by weight of
other fluoromonomers. The materials covered herein do not tive Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
include mixtures of PTFE with additives such as colors, fillers,
or plasticizers; nor do they include reprocessed or reground D1708 Test Method for Tensile Properties of Plastics by Use
of Microtensile Specimens
resin or any fabricated articles because the properties of such
materials have been irreversibly changed when they were D1895 Test Methods for Apparent Density, Bulk Factor, and
Pourability of Plastic Materials
fibrillated or sintered.
D3892 Practice for Packaging/Packing of Plastics
1.2 The values stated in SI units as detailed in IEEE/ASTM
D4052 Test Method for Density, Relative Density, and API
SI-10 are to be regarded as standard. The values given in
Gravity of Liquids by Digital Density Meter
parentheses are for information only.
D4441 Specification for Aqueous Dispersions of Polytet-
1.3 The following safety hazards caveat pertains only to the
rafluoroethylene
Specimen Preparation Section, Section 9, and the Test Methods
D4591 Test Method for Determining Temperatures and
Section, Section 10, of this specification: This standard does
Heats of Transitions of Fluoropolymers by Differential
not purport to address all of the safety concerns, if any,
Scanning Calorimetry
associated with its use. It is the responsibility of the user of this
D4894 Specification for Polytetrafluoroethylene (PTFE)
standard to establish appropriate safety and health practices
Granular Molding and Ram Extrusion Materials
and determine the applicability of regulatory limitations prior
E11 Specification for Woven Wire Test Sieve Cloth and Test
to use. See Warning note in 9.1.1 for a specific hazards
Sieves
statement.
E29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications
NOTE 1—Information in this specification is technically equivalent to
E177 Practice for Use of the Terms Precision and Bias in
related information in ISO 20568-1 and ISO 20568-2.
ASTM Test Methods
1.4 This international standard was developed in accor-
IEEE/ASTM SI-10 Use of the International System of Units
dance with internationally recognized principles on standard-
(SI): The Modern Metric System
ization established in the Decision on Principles for the
4
2.2 ISO Standards:
Development of International Standards, Guides and Recom-
ISO 20568-1 Plastics Fluoropolymer Dispersions and Mold-
mendations issued by the World Trade Organization Technical
ing and Extrusion Materials—Part 1: Designation and
Barriers to Trade (TBT) Committee.
Specification
ISO 20568-2 Plastics Fluoropolymer Dispersions and
Molding and Extrusion Materials—Part 2: Preparation of
1
This specification is under the jurisdiction of ASTM Committee D20 on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic
3
Materials. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2018. Published November 2018. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1989. Last previous edition approved in 2016 as D4895 – 16. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/D4895-18. the ASTM website.
2 4
Specifications for other forms of polytetrafluoroethylene are found in Specifi- Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
cations D4441 and D4894. 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 − 18
Test Specimens and Deter
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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 − 16 D4895 − 18
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 polytetrafluoroethylene (PTFE) prepared by coagulation of a dispersion. These PTFE resins are
homopolymers of tetrafluoroethylene or modified homopolymers containing not more than 1 % by weight of other fluoromono-
mers. 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 12086-1ISO 20568-1 and ISO 12086-2.ISO 20568-2.
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
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
D1708 Test Method for Tensile Properties of Plastics by Use of Microtensile Specimens
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
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods
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 May 1, 2016Nov. 1, 2018. Published May 2016November 2018. Originally approved in 1989. Last previous edition approved in 20152016 as
D4895 - 15.D4895 – 16. DOI: 10.1520/D4895-16.10.1520/D4895-18.
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 [e-mail]. 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. United States
1

---------------------- Page: 1 ----------------------
D4895 − 18
IEEE/ASTM SI-10 Use of the International System of Units (SI): The Modern Metric System
4
2.2 ISO Standards:
ISO 12086-1ISO 20568-1 Plastics Fluoropolymer Dispersio
...