Metallized Carbon Corp.’s Metcar Grade M-58 can be used in food contact applications, with its dry running, food mixer seals to provide lower seal friction and longer seal wear life. For pharmaceutical applications, there are several devices that have passed the tests required for U.S. Pharmacopeia Class VI approved materials.
Dry running mechanical seals are used on large, vertical mixers to seal the clearance between the agitator shaft and the mixer housing at the location where the shaft enters the top of the mixer. Primary seal ring wear life has been a problem with these mechanical seals because they must run dry with high shaft run-out.
The unit is an electro graphite base material that contains a special additive to reduce friction and improve the dry running wear rate. Available fully machined to the customer’s drawing specifications, the primary seal rings can be used in temperatures between -30 F and 800 F.
The system can also be used in many other machine part applications where an FDA approved, self-lubricating material, with low friction and long wear life is required. For FDA approved bearings, seal rings, vanes, rotors, end plates, piston rings, valve seats, and other machine parts that must run submerged in beverages or liquefied foods, there are carbon-graphite grades available that are impregnated with thermal setting resin, copper, tin bronze, or nickel chrome.
