Specifications:1) Appearance: black particles 2) Sulfur content (%): 11-12 3) Heating depredation (%105): 2 4) Ash content (%): 11-12 5) 2-butanone insolubility (%): 49-55Features: 1) A necessary processing aid for radial ply tires 2) Improves tensile strength, tearing strength and perma-deformation of rubber 3) Widely used in tires and rubber belts