Kekuatan fisik kulit kaki ayam pedaging samak nabati ditinjau dari perbedaan lama penyimpanan dengan garam kristal

The aim of this research was to identify physical strength (tensile strength, elongation at break and tear strength) of shank skin leather which had been painted salt for 12 weeks. Raw materials used in this research were shank skins taken from Glagah. Yogyakarta, while 60 ? 70 sides of skins were used for each treatment. 250% salt calculated from the weight of the skins was painted on the flesh sides, the were then preserved in 0; 2; 4; 6; 8; 10 and 12 weeks, followed by vegetable tanning process. A 5 sides of speciment was taken randomly from every treatment for tensile strength and elongation at break tests, while 4 sides of them was taken randomly from every treatment for tear strength test. The test result of tensile strength, elongation at break and tear strength of skins preserved for 12 weeks were successively 113,558 kg/cm2; 66% and 17.745 kg/cm. Compare to SNI 0250-89-A, tensile strength and elongation at break still comformed the requiment stated. Data analyse used in this study was Complete Random Design (CRD) and the data showed that there were not significant difference. It has practical meaning that the use of crystal salt 250% from the weight of shank skins for 2 weeks preservation will produce good quality leather viewed from their physical strength.