ASTM D7211-23

Podrobné informace

Označení: ASTM D7211-23

Datum vydání: 01.05.2023

Stran: 4

Země: Americká technická norma

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Anotace

This specification establishes the requirements for finished parts machined from unplasticized polychlorotrifluoroethylene (PCTFE) homopolymers containing regrind and recycled polymer intended for general commercial use. This specification does not cover parts machined from PCTFE copolymers, PCTFE films or tapes, or modified PCTFE containing pigments or plasticizers. Nor does it cover PCTFE parts used in aerospace applications involving storage and handling of oxygen media, air media, inert media, and certain reactive media (specifically ammonia, gaseous hydrogen, and liquid hydrogen), wherein dimensional stability, high molecular weight, molecular weight retention, and crystallinity control are important considerations. Materials shall be tested on and conform accordingly to the following properties: specific gravity; melting point; deformation under load; zero strength time (ZST); annealing performance; and dimensional stability.


Keywords:
annealing, dimensional stability, finished parts, PCTFE, polychlorotrifluoroethylene,, ICS Number Code 83.140.01 (Rubber and plastic products in general)