Moisture regain, definition

Polychlal fiber n. A manufactured, bicomponent fiber of polyvinyl alcohol and polyvinyl chloride. Some vinyl chloride is grafted to the polyvinyl alcohol (Japanese Chemical Fibers Association definition). The fiber is emulsion spun into tow and staple. Characteristics polychlal fibers have a soft, lamb s wool-like hand and moderate moisture regain. The fibers are also characterized by high flame resistance and high... 

The definition of M as given above is equivalent to the term regain as used for certain other hygroscopic materials such as textiles (J). The term moisture content is defined on a wet rather than dry weight basis. The wet basis moisture content is then related to M by... 

Standard condition n. Standard condition is that reached by a specimen when it is in moisture equilibrium with a standard atmosphere. Standard condition is seldom realized in practice since laboratory atmospheres are continually fluctuating between narrow limits, and it is not practical to wait for the attainment of moisture equilibrium, which would require several days or more for tightly wound samples of high regain material. Practically, specimens are brought to moisture equilibrium in the standard atmosphere for testing as defined in these definitions. The term standard condition should not be used as a Syn the concept of standard atmosphere . 

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