ASTM D4441-20
Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene

Standard No.

ASTM D4441-20

Release Date

2020

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM D4441-20

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 20568-1 and ISO 20568-2. 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 parentheses 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. 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.

ASTM D4441-20 Referenced Document

• ASTM D3892 Standard Practice for Packaging/Packing of Plastics
• ASTM D4464 Standard Test Method for Particle Size Distribution of Catalytic Materials by Laser Light Scattering
• ASTM D4591 Standard Test Method for Determining Temperatures and Heats of Transitions of Fluoropolymers by Differential Scanning Calorimetry
• ASTM D4894 Standard Specification for Polytetrafluoroethylene (PTFE) Granular Molding and Ram Extrusion Materials
• ASTM D4895 Standard Specification for Polytetrafluoroethylene (PTFE) Resin Produced From Dispersion
• ASTM D883 Standard Terminology Relating to Plastics*， 2024-02-01 Update
• ASTM E70 Standard Test Method for pH of Aqueous Solutions With the Glass Electrode
• IEEE/ASTM SI 10 American National Standard for Metric Practice
• ISO 20568-1 Plastics - Fluoropolymer dispersions and moulding and extrusion materials - Part 1: Designation system and basis for specifications
• ISO 20568-2 Plastics - Fluoropolymer dispersions and moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties

ASTM D4441-20 history

• 2020 ASTM D4441-20 Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
• 2015 ASTM D4441-15 Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
• 2004 ASTM D4441-04(2010) Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
• 2004 ASTM D4441-04 Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
• 1998 ASTM D4441-98 Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene