Table 3. A Compounding Procedure

Time Action RPM
Step 1 (120°C) 0:00 – 0:40 (40 sec) rubber, surfactant or TDAE oil 20
0:40 – 1:40 (1 min) silica 1/2 + silane 1/2 40
1:40 – 2:40 (1 min) silica 1/2 + silane 1/2 40
2:40 – 4:40 (2 min) ZnO, St/A, 6PPD 50
4:40 – 5:00 (20 sec) ram up and sweep 50
5:00 – 7:40 (2 min 40 sec) extra mix and dump 50
Step 2 (50°C) 0:00 – 0:20 (20 sec) mix 1st MB 20
0:20 – 1:00 (40 sec) sulfur, cure accelerator (CBS, DPG) 40
1:00 – 2:00 (1 min) extra mix and dump 40