3.5.4. Effect of fuel
NBR rubber is applied specifically as fuel and oil resistant. The
resistance can be followed up by measuring the change of weight%,
by immersing in fuel A (commercial gasoline) and then plotted as a
function of different curing systems, as shown in Fig. 4. It can be
seen that the NBR cured by radiation/coagent gave the best results
for swelling resistance in commercial gasoline compared to the
sulfur and peroxide systems at the same Vr value. The resistance
to swelling can be argued on the basis of the chemical crosslinking
magnitude induced in the rubber component by radiation with respect
to the other methods of curing.