Table 2: Vulcanization characteristics of the rubber compounds investigated.

NR1 NR2 NR3 NR4 NR5 NR6 , dNm 0.15 0.11 0.15 0.20 0.20 0.22 , dNm 9.90 9.86 9.35 9.15 9.00 8.92 Δ = − 9.75 9.75 9.20 8.95 8.80 8.70 , min:s 4:21 4:24 4:27 4:30 4:35 4:39 , min:s 8:02 8:33 8:50 9:13 9:20 9:25