The best properties can be obtained using a hydrogenated
rubber which has oil resistance like NBR and heat and ozone
resistance like ethylene-propylene-diene. As the nitrile content of
HNBR increases, swelling of mineral oils decreases. But, the loss
of low-temperature flexibility over ordinary NBR is extremely lowThis means that an HNBR product with high nitrile NBR can be used
to optimize oil resistance and low-temperature flexibility.