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standard by American Association of Textile Chemists and Colorists, 01/01/1999
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1. Purpose and Scope
1.1 This test method determines the efficiency of ordinary commercial wetting agents.
2. Principle
2.1 A weighted cotton test skein is dropped into a tall cylinder containing a water solution of a wetting agent. The time required for a string stirrup connecting the weight and the skein to relax is recorded as the sinking time.