Mechanical Properties of Set Keratin Fibers

Various degrees of set, and sets of various degrees of permanence, were imparted to four keratin fiber types: human hair, kid mohair, a noncrimp coarse wool, and a fine high-crimp wool. The sets were imparted in a water system at 97° C and at room temperature. The mechanical properties at 70° F and 65% RH of the set fibers were measured and examined in relation to the type and degree of set imparted. In general, fibers with a permanent set are weaker and more extensible than fibers with a temporary set. Significant differences in behavior were observed among the four fiber types.