The stress-strain behavior of different concentrations of low- structure high abrasion furnace black (HAF-LS)- loaded rubber blend of styrene butadiene rubber and natural rubber (SBR+NR) of equal parts was measured. Modulii of elasticity and the n- measure of such blends were calculated using different approaches. An anomaly, of modulus of elasticity, found at 50 phr may be attributed either to what is called compact structure and!or to the early crystallization of natural rubber (NR) in the blend. These assumptions are confirmed through the measurement of the swelling factor as a function of time of swelling in kerosene.
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