See Lubrication

A lubricant meeting application or regulatory requirements on toxicity, bioaccumulation, biodegradability, and, in certain circumstances, renewable content.

That portion of a lubricant that volatilized in use or in storage. Typical test methods are ASTM D972 and D2595.

Extreme pressure (EP) additives enhance the load carrying capacity of a grease under boundary lubrication conditions. EP additives chemically react with the metal surface under conditions of high load and elevated temperature, forming a chemically bonded lubricating film.

The ability of a lubricant to reduce scuffing, scoring and seizure that can occur when highly-loaded moving surfaces are in contact. High loads are applied to moving surfaces that are in contact. Commonly used laboratory test measurements of the EP level of greases are the Timken OK Load (ASTM D2509, 4-Ball Weld and Load Wear Index (ASTM D2596), and EP by SRV Step Load (ASTM D5706).