ASTM D4441-20(2025)

Podrobné informácie

Označenie: ASTM D4441-20(2025)

Dátum vydania: 01.07.2025

Stránok: 6

Krajina: Americká technická norma

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Anotácia

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.


Keywords:
fluoropolymers, polytetrafluoroethylene, polytetrafluoroethylene dispersions, PTFE,, ICS Number Code 83.080.20 (Thermoplastic materials)