When mixed with rice husk ash, the amount of 5 phr with a maximum hardness of 52 Shore A. The rubber was mixed with activated charcoal, the amount of 40 phr with a maximum hardness of 68 Shore A and a rubber mixing charcoal, volume 40 phr. RHA and volume 1 and 3 phr with a maximum hardness of 67 Shore A..
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