Then all the other ingredients (commercial grades), sulfur as curing agent (2.5 part per hundred rubber, phr), zinc oxide (4 phr) as activator, stearic acid (1.5 phr), processing oil (2 phr), mercaptobenzothiazole disulfide (2 phr) as accelerator, azodicarbonamide (ADC) (6 phr) as foaming agent and carbon black (20 phr) as filler, were slowly added and mixing was performed for 8 min at room temperature using a laboratory two-roll mill
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