Abstract
The objective of this research was to study the effect of fillers such as carbon black, caolin, and calcium carbonates on the physic-mechanical properties of rubber product (rubber wave s ). The design formula of this research was five formulas (A; B; C; D; and E), that designs as follows natural rubber (92; 90; 88; 84; and 80) phr; chlorprene rubber (4; 5; 6; 8; and 10); carbon black (50; 49; 48; 47; and 46) phr; caoline (10; 8; 6; 4; and 2) phr; and calcium carbonate (2; 4; 6; 8; and 10) phr respectively for each formulas . The natural and synthetics were masticated using two roll mill and then vulcanized according to the standard procedures . The best formula for rubber wave product is formula B that has properties as follows: specific gravity 1.206; hardness 71 shore A; abrasion resistance 190 mm 3 ; 300% modulus 7.9 MPa; tensile strength 12.8 MPa; compression set 9.51%; and ozone resistance no crack .
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