SBR (styrene-butadiene rubber) is a low cost non-pil resistant matera. it has good water resistance and reslience up to 70 durometer;compression set becomes poorer with higher durometer; generally saisfactory for most moderate chemicals and wet or dry organic acidsSBR is not recommended for ozone, strong acids, ois, greases, fats and most hydrocarbons. SBR can be molded.