What kind of material is the sealing ring on the bearing?
Acrylonitrile butadiene rubber also has certain acid and alkali resistance. But for oil resistance and pH better, then also preferred silica gel (more expensive). EPDM is good for acid and alkali (except strong acid), but it is not oil resistant
NBR oil resistance of nitrile rubber is the best in the general rubber, nitrile rubber and hydrogenated nitrile rubber with more excellent oil resistance, oil resistance, but if your request is not too harsh words with NBR, HNBR because the price is relatively expensive.
Bearing sealing materials used are generally sealed materials commonly used are: nitrile rubber, silicone rubber, fluorine rubber, vinyl three ethylene propylene rubber, chloroprene rubber, fluorine rubber, PTFE, polyurethane acrylic rubber, anaerobic adhesive etc.. If you don't understand the problem of bearing, you can ask me.
