Effects of Blend Ratio and SBR Type on Properties of Carbon Black-Filled and Silica-Filled SBR/BR Tire Tread Compounds

Table 2

Compound formulations.

Ingredient	SBR/BR blend ratio
	100/0	90/10	80/20	70/30	0/100
SBR (6450SL or 1723)	137.5	123.75	110	96.25	0
BR	0	10	20	30	100
ZnO	3	3	3	3	3
Stearic acid	2	2	2	2	2
6PPD	1.5	1.5	1.5	1.5	1.5
TMQ	1	1	1	1	1
Paraffin wax	2	2	2	2	2
Filler (CB or Silica)	80	80	80	80	80
	8	8	8	8	8
TDAE	10	13.75	17.5	21.25	47.5
TBBS	1.2	1.2	1.2	1.2	1.2
TBzTD	0.2	0.2	0.2	0.2	0.2
Sulfur	2.2	2.2	2.2	2.2	2.2

was added only in silica-filled system. oil content was kept constant at 47.5 phr for all compounds.