Advanced Materials & Tribology supplies Chemical Resistant Stock Agitator Shaft Bushing. Advanced Materials & Tribology offers a wide range of Oil-less self-lubricated Bearings and Plates, Self Lubricating Bushes and Pump Bearings. Advanced Materials & Tribology is an ISO accredited company. The Chemical Resistant Stock Agitator Shaft Bushing can frequently run dry because of changing liquid levels and operated in changing wet to dry conditions.