Lubricant and Penetrating Fluid

A lubricant is a higher-viscosity fluid (oil) or semi-solid (grease) that contains much oil. Lubricants are commonly used to reduce friction between moving surfaces in mutual contact. Typically, grease lubricants contain about 85% base oil and less than 15% thickeners and additives. A lubricant should be used if the materials that the parts are made from have undesired friction when operated against each other. Penetrating fluids contain a very low-viscosity oil. The low viscosity of the penetrating fluid allows it to flow easily between close surfaces and loosen dried lubricants. Penetrating fluids can be used to free corroded or rusted mechanical parts. It can sink into the narrow spaces between parts and wash out elements like rust and corrosion.