This study aimed to obtain the optimum concentration of Sappan Wood Extract, Quartz Sand and Clamshell mixture. For this purpose, Response Surface Methodology (RSM) was used to optimize the factors which influenced the quality of rubber compound. There were two factors to be observed in this study. They were the concentration of Sappan ood Extract (8 phr, 9 phr and 10 phr) and the mixture Quartz Sand and Clamshell (63:37, 73:27 and 83:17). The observed parameters were the hardness, the tensile strength and the elongation at break. The results of the study showed that the optimum hardness was reached at the treatment combination of 8.55 phr for the Sappan Wood Extract and 77.7:22.3 for the mixture of Quartz Sand and Clamshell mixture. Furthermore, the optimum tensile strenght was obtained at the treatment combination of 8.48 phr for the Sappan Wood Extract and 60.3:39.7 for the mixture of quartz sand and seashell. Finally, the optimum elongation at break was reached at the treatment combinatioan of 9,55 phr for the sappan wood extract and 70.65:29.35 for the mixture of of quartz sand and clamshell. Based on these three parameters, the optimum USAge of sappan wood extract, quartz sand and clamshell mixture in the making of rubber compound was reached in the proportion of 8.48 phr–9.55 phr for the sappan wood extract, and 60:39.7; 77.7:22.3 for the mixture of quartz sand and clamshell.
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