Table 1. Experimental Formulations for Compounds with Carbon Black and Silica Binary Fillers (unit : phr)

Compound code		T-1	T-2	T-3	T-4	T-5	T-6	T-7
Stage 1	Natural Rubber	100	100	100	100	100	100	100
	Carbon black (N110)	15	45	60	60	60	30	40
	Silica (7000GR)	30	30	30	15	45	15	20
	X50-S*	4.8	4.8	4.8	2.4	7.2	2.4	3.2
	TDAE oil	13.3	13.3	13.3	13.3	13.3	13.3	13.3
	Zinc oxide	3	3	3	3	3	3	3
	Stearic acid	2	2	2	2	2	2	2
	6PPD	2	2	2	2	2	2	2
	TMQ	2	2	2	2	2	2	2
Stage 2	Stage 1 masterbatch	200	200	200	200	200	200	200
	Sulfur	1.6	1.6	1.6	1.6	1.6	1.6	1.6
	DPG	0.5	0.5	0.5	0.5	0.5	0.5	0.5
	TBBS	2.6	2.6	2.6	2.6	2.6	2.6	2.6
	PVI	0.2	0.2	0.2	0.2	0.2	0.2	0.2