Metallized Carbon Corporation (Metcar) has developed bearings specially designed for dry running in high temperature applications. Metcar high temperature bearings are designed for use at temperatures ranging from 350 to 1000°F in oxidizing atmospheres, and from 350 to 6000°F in non-oxidizing atmospheres. At high temperatures, oil-grease lubricated ball, roller and sleeve bearings are problematic because the oil-grease lubricants can melt, volatilize or carbonize. Plastic and composite bearing materials can soften, deform or melt at such high temperatures.The bearings rely on graphite for their self-lubricating properties, which will avoid the shortcomings associated with petroleum-based lubricants at elevated temperatures. Metcar says the bearings are dimensionally stable, and not subject to melting, softening, or deformation.The Metcar bearings are designed for use in continuous dryers, high temperature conveyors, kiln cars and high temperature ventilation dampers. They can also be used for other high temperature equipment, including continuous bakery ovens, screw conveyors, valves, and paint dryers. Several Metcar grades have received FDA approval for use in contact with foods and pharmaceuticals.