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Physical appearance black slab Acetone - extract % 10 ¦ 3 Ash % 4 ¦ 2 Carbon black % 30 ¦ 2 Rhc % 50 ¦ 4 Specific gravity 1.10 ¦ 0.05 Volatile matter % < 1 Mooney viscosity ml (1+4) 100o c 30 - 50 Tensile strength kg/cm2 80 Elongation > 450