The variation of the cure rate index of all the rubber mixes
with the concentration of the two promoters is shown inFig. 3.
From this figure, it can be noticed that the cure rate index of
mixes with manobond promoter increases with increasing man-obond concentration. Meanwhile, the values of (CRI) for mixes
with KMR promoter are almost unaffected by increasing the KMR
concentration. This is may be attributed to the role of KMR acting
as a compatibilizer in increasing the miscibility of all ingredients
during the curing process and giving rise to mixes having almost
the same cure rate indices[32]