محمد هليل رسن القريشي

This work attempts to study the improvement of Nitrile rubber (NBR) properties such as weather (Ozone attack), thermal and chemical (swelling) resistance after blending with saturated Hydrogenated Nitrile Rubber (HNBR). It is well-known that HNBR is almost saturated rubber, it is resistant to ozone and it has inherent character of oil resistance also, but it is too costly to be economically viable in many cases. Because of its less enough saturation, NBR is not ozone and chemical resistant. For mixing purpose Master Batch (MB) of both rubbers at different proportion were prepared. Intended Rheometric, Physic-mechanical properties and chemical resistance were determined according to American society for testing materials (ASTMs). Ozone and air aging testing were carried out also. The results of the study clearly shows that a little amount of HNBR along with anti-degrading (Anti-Ozonant) provides considerable improvement mechanical and chemical properties such as air ageing, tear strength, resistance oil swelling and resistance to ozone attack. This could be attributed to good compatibility between HNBR and NBR which gives uniformity and helps to provide protection from weather without deterioration in physic-mechanical properties

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