Table 2. Mixing Procedure

Step	Time (min:sec)	Revolutions per minute (RPM)	Action
Stage 1	0:00-0:30	15	Rubber
	0:30-1:30	30	Silica and chemicals
	1:30-1:40	30	Sweep
	1:40-5:30	Variable	Mixing and Silanization (during 3 min at 155°C)
	5:30	Variable	Dump at 155°C after silanization reaction
	Sheeting	-	Two roll mill
Stage 2	0:00-0:20	15	Compounds of stage 1
	0:20-1:00	30	Add sulfur, cure accelerator
	1:00-2:00	30	Extra mix and dump (under 100°C)
	Sheeting	-	Two roll mill