Table 2. Compounding Procedures for the NR Binary Filler Compounds

Stage 1
0 – 20" Rubbers (initial temperature : 110°C)
20" – 1' 00 1/2 filler (carbon black)
1' 00" – 1' 40" 1/2 filler (carbon black)
1' 40" – 2' 40" Oil
2' 40" – 3' 40" 1/2 filler (silica), 1/2 silane
3' 40" – 4' 40" 1/2 filler (silica), 1/2 silane
4' 40" – 5' 40" ZnO, Stearic acid, 6PPD, TMQ
5' 40" – 10' 40" Extra mix and dump (dump temperature: 150-155°C)
Stage 2
0 – 20" Compounds of stage 1 (initial temperature : 50°C)
20" – 1' Sulfur, cure accelerators (TBBS, DPG, PVI)
1' – 2' Extra mix and dump (dump temperature : 100°C)