ASTM F2191/F2191M-13(2025)

Anotácia textu normy ASTM F2191/F2191M-13(2025) :

This specification covers staple or continuous filament carbon/graphite yarn valve stem compression packing, suitable for use as end-rings on packing systems for valves. Intended services include steam, hydrocarbons, water and non-oxidizing chemicals. The material shall be of the following types, classes, and grades: Type I, type II, and Type III; Class 1; Class 2; and Class 3; and Grade A and Grade B. The following tests shall be performed: size; mass; carbon assay; ash content; specific gravity; moisture content; detrimental materials tests; analysis of PTFE coating; compression recovery; and braid geometry retention.


Keywords:
carbon braided yarn, graphite, packing material, valve stem compression packing,, ICS Number Code 55.040 (Packaging materials and accessories)