Testing of Physical and Chemical Properties of Thai-Race Silk Yarns

Abstract

The solubility, size and its deviation, and tenacity of four grades of unbleached Thai-race silk yarns and bleached Thai-race silk yarns were tested. The results were then compared to those of hybrid foreign-race silk yarns. The testing methods set by the Office of Industrial Products Standards, Ministry of Industry were adopted. It was found that all samples have almost the same solubility. In addition, all samples of Thai-race silk yarns have much bigger size and higher deviation than the hybrid silk yarns. They also exhibit less tenacity than the hybrid silk. Among the Thai-race silks, the tested qualities for grade 1 to 4 are found to be decreased respectively.