Table 1. Physical properties of the SBR compounds.

Physical property	SBR-0	SBR-R
100% Modulus (MPa)	1.26	0.70
200% Modulus (MPa)	2.38	1.19
300% Modulus (MPa)	3.97	1.93
400% Modulus (MPa)	5.98	2.86
500% Modulus (MPa)	8.23	3.99
Elongation at break (%)	552	985
Tensile strength (MPa)	16.9	13.0