Features and Specifications
A good quality lubricant reduces friction and wear, dissipates heat, keeps out dirt, and prevents rust formation. It must provide good "boundary layer" lubrication, and be thin enough to get between moving parts, and once there, it must be thick enough to separate them with a slippery oil film. This oil film must be strong enough to provide full-film "hydrodynamic" lubrication between moving parts such as bearings, screw actuators, etc. It must also act as a kind of floating seal, filling in the microscopic imperfections in moving surfaces with a thin film of lubricant. If it is too thin, under shock or extreme loads it will not separate moving surfaces. If it is too thick, it cannot squeeze between the moving parts to provide proper lubrication. If either extreme exists, friction and wear occurs; accumulating wear debris escalates wear until failure occurs. Heat is generated between moving parts in machines, even though they are lubricated. Some greases can reduce the operating temperatures of bearings , gears, or other moving parts by having better EP and anti-wear properties thereby reducing the metal to metal contact and the associated heat. Grease lubricants also work as a seal, keeping out dirt and other foreign matter, thus preventing damage to the bearing and contact surfaces. The effect of rust or corrosion on unprotected metal can readily be understood. A lubricating film on moving parts protects them from this damage by preventing contact with air, moisture or other corrosive agents thereby increasing useful life.