พลาสติก
เอกสารมาตรฐาน
สหรัฐอเมริกา
ASTM
D4441-20
Standard Specification for Aqueous Dispersions of Polytetrafluoroethylene
2020
6
ASTM Vol.08.02 (2022)
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. 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. This specification is for virgin material only and does not address recycled material as it is not appropriate for dispersions. 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.
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