Ozone resistance of highly saturated nitrile rubber (HNBR) has been studied; the effect of hydrogenation progress of HNBR was evaluated at various ozone test conditions such as static, dynamic, and sequential condi tions.
Dependence of its hydrogenation progress on ozone resistance is discussed by using parameters of Ii, Iodine value which enhanced ozone resistance of base NBR, Io, Iodine value which demonstrates no cracks for 1000 hours, and Δ, the slope of ozone crack initiation time against Iodine value.
Ozone resistance of HNBR was compared with that of typical specialty elastomers. Fully saturated HNBR exhibits excellent ozone resistance.
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