Comparison Between a Few Types of Natural Rubber.

This study, which focused on a comparison between several types of natural rubbers from different origins and sources: round blue Smoked Sheet, ICR, SMR 5 CV, 10 and 20, Nat 601, 301, 203, PB 5, Polycam and DPNRCV, shows that there are some differences on the level of the Mooney consistency, the nitrogen rate and the percentage of impurities of these samples. In pure gum blends, some of them (ICR, round blue SS, Nat 601) distinguish themselves by their great vulcanization velocity and their high modulus values. Conversely, the rubbers with a stabilized viscosity have rather low moduli and are considerably more damped than the others. Yet in loaded blends and especially in industrial ones, a marked levelling out of the various samples can be observed.