Table 1: Compositions of the NR-based rubber compounds.

NR1NR2NR3NR4NR5NR6

Natural rubber SMR 10100100100100100100
Zinc oxide555555
Stearic acid222222
Fullerene powder00.50.751.01.251.5
TBBS*0.80.80.80.80.80.8
Sulphur2.252.252.252.252.252.25

*TBBS: N-tert-Butyl-2-benzothiazolesulfenamide.