Table 2. Mixing Procedure of Silica-filled SBR/BR Compounds

Stage	Step	Duration, s	Temperature, °C	Rotation, rpm
Initial masterbatch	charge rubber
	mix	0-30
	add silica with oil and TESPT	30-270	110	50
	add ZnO and S/A	300-310
	mix and dump	310-600
	milling (11 cycles)		50	20
Final masterbatch	charge the initial masterbatch
	mixing	0-30
	add S, CBS, and DPG	30-40	70	40
	mix and dump	40-150
	milling (11 cycles)		50	20