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ASTM D4441-04

(Specification)

Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene

Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene

ABSTRACT
This specification establishes the properties and test methods for aqueous dispersions of polytetrafluoroethylene (PTFE) resins, and is used to determine if a shipment, lot, or container of PTFE dispersions is suitable for its intended use. These resins are homopolymers of tetrafluoroethylene, or in some cases modified homopolymers containing not more than 1% by weight of other fluoromonomers, and the dispersions are usually stabilized by one or more surfactants. Other non-PTFE materials may be present in total at 5% or less by weight for special purposes. This specification is for virgin materials only, and does not cover PTFE copolymers or filled dispersions, and recycled materials as they are not appropriate for dispersions. Materials shall be appropriately sampled for testing on the following: pH value; solid and surfactant content by gravimetric weight loss; solid content by hydrometer; test for coagulated polymer; specific gravity; and melting characteristics.
SCOPE
1.1 This specification covers aqueous dispersions of polytetrafluoroethylene (PTFE) resins. These resins are homopolymers of tetrafluoroethylene, or in some cases modified homopolymers containing not more than 1 % by weight of other fluoromonomers.
1.1.1 The dispersion is usually stabilized by one or more surfactants. Other non-PTFE materials may be present in total at 5 % or less by weight for special purposes.
1.1.2 This specification is for virgin material only and does not address recycled material as it is not appropriate for dispersions.
1.2 This specification is used to determine if a shipment, lot, or container of PTFE dispersion is suitable for its intended use. It covers only aqueous dispersions of polytetrafluoroethylene. It does not cover PTFE copolymers or filled dispersions. This specification includes test methods for both aqueous dispersion and the PTFE in the dispersion.
Note 1—Uses for the PTFE dispersion covered by this specification include, but are not limited to, casting of their films, impregnation of mechanical packings and other materials, surface coatings on various substrates, combined impregnation and coating of fibrous materials, and co-coagulation with other materials for subsequent processing into films, sheets, rods, and tubes.
Note 2—Information in this specification is technically equivalent to related information in ISO 12086-1 and ISO 12086-2.
1.3 The values stated in SI units as detailed in IEEE/ASTM SI-10 are to be regarded as standard. The values given in brackets are for information only.
1.4 The following precautionary caveat pertains only to the test method portions 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. Specific precautionary information is given in Notes 5 and 6.

General Information

Status
Historical
Publication Date
31-May-2004
ICS
83.080.20 - Thermoplastic materials
Technical Committee
D20 - Plastics
Drafting Committee
D20.15 - Thermoplastic Materials
Current Stage
Ref Project

Relations

Replaces
ASTM D4441-98 - Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
Effective Date
01-Jun-2004
Replaced By
ASTM D4441-04(2010) - Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
Effective Date
01-Jan-2010
Referred By
ASTM D4969-17(2022) - Standard Specification for Polytetrafluoroethylene–(PTFE) Coated Glass Fabric
Effective Date
01-Jun-2004
Referred By
ASTM D4895-18(2023) - Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
Effective Date
01-Jun-2004
Referred By
ASTM D4894-19 - Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
Effective Date
01-Jun-2004

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ASTM D4441-04 - Standard Specification for Aqueous Dispersions of PolytetrafluoroethyleneASTM D4441-04 - Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
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ASTM D4441-04 - Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
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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: D4441 – 04
Standard Specification for
1
Aqueous Dispersions of Polytetrafluoroethylene
This standard is issued under the fixed designation D4441; 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.
1. Scope* 2. Referenced Documents
2
1.1 This specification covers aqueous dispersions of poly- 2.1 ASTM Standards:
tetrafluoroethylene (PTFE) resins. These resins are homopoly- D883 Terminology Relating to Plastics
mers of tetrafluoroethylene, or in some cases modified ho- D3892 Practice for Packaging/Packing of Plastics
mopolymers containing not more than 1 % by weight of other D4464 Test Method for Particle Size Distribution of Cata-
fluoromonomers. lytic Material by Laser Light Scattering
1.1.1 The dispersion is usually stabilized by one or more D4591 Test Method for Determining Temperatures and
surfactants. Other non-PTFE materials may be present in total Heats of Transitions of Fluoropolymers by Differential
3
at 5 % or less by weight for special purposes. Scanning Calorimetry
1.1.2 This specification is for virgin material only and does D4894 Specification for Polytetrafluoroethylene (PTFE)
3
not address recycled material as it is not appropriate for Granular Molding and Ram Extrusion Materials
dispersions. D4895 Specification for Polytetrafluoroethylene (PTFE)
1.2 Thisspecificationisusedtodetermineifashipment,lot, Resin Produced From Dispersion
or container of PTFE dispersion is suitable for its intended use. E70 Test Method for pH of Aqueous Solutions With the
It covers only aqueous dispersions of polytetrafluoroethylene. Glass Electrode
It does not cover PTFE copolymers or filled dispersions. This IEEE/ASTMSI-10 UseoftheInternationalSystemofUnits
specification includes test methods for both aqueous dispersion (SI): The Modern Metric System
4
and the PTFE in the dispersion. 2.2 ISO Standards:
ISO 12086-1 Plastics Fluoropolymer Dispersions and
NOTE 1—Uses for the PTFE dispersion covered by this specification
Molding and Extrusion Materials—Part 1: Designation
include, but are not limited to, casting of their films, impregnation of
and Specification
mechanical packings and other materials, surface coatings on various
substrates, combined impregnation and coating of fibrous materials, and ISO 12086-2 Plastics Fluoropolymer Dispersions and
co-coagulation with other materials for subsequent processing into films,
Molding and Extrusion Materials—Part 2: Preparation of
sheets, rods, and tubes.
Test Specimens and Determination of Properties
NOTE 2—Information in this specification is technically equivalent to
related information in ISO 12086-1 and ISO 12086-2.
3. Terminology
1.3 The values stated in SI units as detailed in IEEE/ASTM
3.1 Definitions:
SI-10IEEE/ASTM SI-10 are to be regarded as standard. The
3.1.1 General—The terminology given in Terminology
values given in brackets are for information only.
D883 is applicable to this specification.
1.4 The following precautionary caveat pertains only to the
3.2 Definitions of Terms Specific to This Standard:
test method portions of this specification. This standard does
3.2.1 dispersion, n—atwophasesystemofwhichonephase
not purport to address all of the safety concerns, if any,
consists of finely divided particles distributed throughout a
associated with its use. It is the responsibility of the user of this
bulk substance, the particles being the disperse phase and the
standard to establish appropriate safety and health practices
bulk phase being the continuous phase.
and determine the applicability of regulatory limitations prior
3.2.2 dispersion particle size—a particle size measured in
to use. Specific precautionary information is given in Notes 5
the presence of added surfactant.
and 6.
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
1
This specification is under the jurisdiction of ASTM Committee D20 on Standards volume information, refer to the standard’s Document Summary page on
Plastics and is the direct responsibility of Subcommittee D20.15 on Thermoplastic the ASTM website.
3
Materials (Section D20.15.12). Specifications for other forms of polytetrafluoroethylene may be found in
Current edition approved June 1, 2004. Published June 2004. Originally Specifications D4894 and D4895.
4
approved in 1984. Last previous edition approved in 1998 as D4441 - 98. DOI: Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
10.1520/D4441-04. 4th Floor, New York, NY 10036.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM Interna
...

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SCOPE
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