This study aims to study the physical characteristics of vulcanized rubber using various clay fillers from layers in the PT. Bukit Asam (Persero) Tbk .. This research was conducted 6 formulas (1,2,3,4,5,6), each variation of clay type INT A2-B1, OBA1, Lower C, INT A1-A2, INT B2-C, INT B1-B2. Then with the same variation carried out the addition of chemicals in the form of JHS-69 and PEG 4000 in each of the 6 formulas as much as 1 phr. The natural rubber used is RSS-1 then rubber is modified and vulcanized along with other process materials in the open mill. Based on the results of the study it has been analyzed that rubber compound number 4 using JH-S69 is better than other rubber compounds, which have a tensile strength value of 17.2 Mpa, elongation at break of 670%, modulus of 300% 4 Mpa, and tear strength 33 kN / m. Whereas the best rubber compound using PEG 4000 is compound number 2 which has a tensile strength value of 16.6 Mpa, elongation at break of 690%, modulus of 300% 2.4 Mpa, and tear strength 28.8 kN / m. From the results of the analysis of the physical properties, the two compounds meet the SNI 0778:2009 standards to be used as shoe soles products.
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