The butadiene-alphamethylstyrene (styrene) rubber is produced by emulsion copolymerization of butadiene and alphamethylstyrene (styrene) at low temperature with an emulsifier being a mixture of rosin soaps and synthetic fatty acids. Vts-150 is used as an antioxidant. Mooney viscosity 47-56 Viscosity lot spread ± 2.5 Conditional tensile strength, mpa(kgs/cm²), not less than 27.9 (285) Elongation at rupture, % 550-750 Residual deformation after rupture, %, not more than 20 Rebound elasticity, %, not less than 39 Loss of the mass on drying, %, not more than 0.35 Fraction of total mass: Ash, %, not more than Cu, %, not more than Fe, %, not more than 25kg pp bag