Pengaruh sumber dan konsentrasi garam (Na Cl) pada proses pengasaman (pickling) terhadap mutu kulit domba untuk sarung tangan

Abstract

The utilization of scrap rubber from tyre-retreading industry for footstep compound have been investigated. Pretreatment of rubber scrap with minarex B was done before it was compounded. The footstep compound was designed with various ratio of RSS/pretreated rubber scrap: 100/0; 75/25; 50/50, and 25/75 respectively. The compounds were prepared on a two-rolls mill machine. The compounds were tested for its physical properties such as tensile strength, elongation at break, abrassion resistance, hardness, density, permanent set, and aging, respectively. Test result was compared with physical properties of current commercial footstep. The physical properties of invented footstep compounds were better than current commercial footstep. The footstep compound made by using the RSS and pretreated rubber scrap in ratio of 75/25 performed the best physical properties with 146,48 kg/cm3 tensile strength; 253,36{%} elongation at break; 58,33 Shore A hardness, 2,91 mm3/kgm abrasion resistance, 1,23 g/cm3 density, 4,69{%} permanent set, and the change of physical properties after aging at temperature 70oC for 3 x 24 hours were 1,90{%} tensile strength, 5,02{%} elongation at break, and 4,04{%} hardness, respectively. Molding of footstep was done at 150o C, and 150 kg/cm2 for 10 minutes. Organoleptics test showed molded footstep good appearance, good homogeneity during curing, and good flowing compound respectively when it was moulded.