Advanced Materials & Tribology supplies Salt Cake Drag Conveyor Anti-Corrosive Pillow Block. 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 Salt Cake Drag Conveyor Anti-Corrosive Pillow Block is used in precipitator drag conveyor systems that are exposed to the hot and corrosive environments of salt cake ash. The Pillow Block eliminates seizure caused by metal-to-metal contact.