Pembuatan kompon cincin karet perapat air minum

The objective of this research was to investigate the effect of ration of natural rubber, synthetic rubber RSS/SBR and carbon black in preparation of compound for Rubber Seal Joint Rings for Water Supply. The ratio of RSS/SBR was 35/63; 25/75; 15/85 phr and Carbon black 20 phr; 30 phr and 40 phr. The vulcanized product of Rubber Seal Joint Rings for Water Supply were then tested their physical properties. Generally the test result were better than those of for Rubber Seal joint rings for Water Supply found in market and they fulfill the requirements of SNI 06-4828-1998 “Spesifikasi cincin karet sambungan air minum, air limbah dan air hujan”. The hardness of product using carbon black in constant quantity and varied quantity of RSS/SBR did not perform significant effect either for pre-ageing. The best hardness of 61 shore A and 65 shore A with 0% change was achieved at the quantity of carbon black 30 phr and 40 phr with ratio RSS/SBR 25/75. The optimum tensile strength of 11.38 MPa and 12.63 MPa with change after ageing of -6.3% and -11.3% was achieved at the quantity of carbon black 20 phr and 30 phr with ratio of RSS/SBR 25/75. The best of elongation at break of 440%with change after ageing 1.35% was achieved at the use of carbon black 20 phr with ratio of RSS/SBR 25/75, where as with ratio RSS/SBR 35/65 and carbon black 30 phr, the elongation at break was 453% and chane after ageing was -1.45%. The best compression set of 5.39% and 5.68% was achieved at the quantity of carbon black 30 phr and 40 phr with ratio RSS/SBR 15/85. The optimum swelling of 2.35% was achieved at the quatity of carbon black and ratio RSS/SBR 25/75 was selected representing the exact composition of vulcanized compound of for Rubber Seal joint rings for Water Supply and perfoming best physical properties fulfilling the quality requirement of SNI 06-4828-1998 “Spesifikasi cincin karet sambungan air minum, air limbah dan air hujan”.