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Material
FOver 150 grades of our proprietary carbon/graphite METCAR material are available. Our engineers will work with you to select the optimum grade.
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Temperature Rating
-400 to 2000 ºF
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Pressure Rating
Automotive fuel pumps Automotive water pumps Canned motor pumps Centrifugal pump bearings and case wear rings Chemical Pumps Fuel pumps Gear pumps Heat transfer oil pumps Hot water circulating pumps Liquid nitrogen pumps
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QA/QC Practices
All raw material physically tested prior to machining DCC/CMM dimensional measurement/verification Optical measurements
Carbon-graphite bearings are used for running submerged in low viscosity liquids like water, gasoline, hot oil, solvents, strong chemicals, molten metals, and liquefied gases. Metallic bearings are often not satisfactory for these applications because the hydrodynamic film provided by these low viscosity liquids is not thick enough to overcome the strong atomic attraction between metal bearings and the metal shaft. Since there is no strong atomic attraction between carbon-graphite and a metal shaft, the thin hydrodynamic film provided by low viscosity liquids provides sufficient lubrication for carbon-graphite bearings. Carbon-graphite is also a self polishing, dimensionally stable material. If the shaft is polished to a fine surface finish, the shaft will polish the carbon-graphite material to the same fine, polished finish. When both the shaft and the bearing have this fine polished surface finish, a thin hydrodynamic film is sufficient to provide lubrication. Plastic or polymer bearing materials often fail in these submerged applications because of their tendencies to swell, soften or deteriorate. Metcar materials can handle all common chemicals except for a few extremely strong oxidizing agents such as hot, concentrated nitric acid.