Advanced Materials & Tribology supplies Gear Pump Internal Bearing. 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 Gear Pump Internal Bearing is mainly used to maintain Pumping recirculated creosote. The Bearing can withstand liquid that is hot, gritty and provides no lubricity to internal pump parts.