Any material interposed between two surfaces that reduces the friction or wear, or both, between them.
Can be liquid, solid (grease) or gaseous (air).
- prevent metal-to-metal contact between moving surfaces
- a cooling medium
- aid chip removal
- protect surfaces from rust and corrosion
See also: Black Oils, Compounded Oil, Corrosion Inhibitor, Dropping Point, Extreme Pressure Lubricants, Foam Inhibitor, Food Grade Lubricants, Friction, Grease, Hypoid Gear Lubricant, Molybdenum Disulphide, Neutralization Number, Oil Detergent, Pour Point, Water Lubricant.
Subjects: Mechanical Engineering