The compounds were mixed as per the formulations given in Tables I and II in a laboratory two-roll open mixing mill at a friction ratio 1 : 1.2.
The rolls were cooled to room temperature by continuous circulation of water.
The curing studies were followed with an oscillating disc rheometer (Monsanto model 100S)at a temperature of 1508C and oscillating arc of 38.
The cure rate index, was calculated from the followingexpression