Table 3. Mixing Procedure

	Time	Action	rpm
Stage 1	0-40″	Rubber mixing	20
	40″ - 1′ 40″	Silica ½ + Silane ½ + DPG ½ + Oil ½	40
	1′ 40″ - 2′ 40″	Silica ½ + Silane ½ + DPG ½ + Oil ½	40
	2′ 40″ - 7′ 40″	Add ZnO, Stearic acid, 6PPD	50
		Dump at 150°C~155°C
Stage 2	0 - 20″	Add master batch from 1st stage	20
	20″ - 2′	Add curatives	40
		Dump at 60°C~70°C	40