Although in our experiment the effect of temperature on expansion was not significant, reported a reduction of expansion with increase in temperature from 140 to 166.8 C in extruded products made from barley and tomato pomace. have proposed that the expansion of extruded products is enhanced by increases in temperature to an optimum point and then it decreases. This temperature depends on the ingredients used. It may be possible that a temperature of 160 C for our products was this optimum point and after this point the expansion decreased with an increase in temperature which resulted in the overall insignificant effect of temperature on expansion.