Table 2.

Compounding procedure for the styrene butadiene rubber (SBR) 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))