NLGI ( National Lubricating Grease Institute) American standard
Grease is a solid and semi-solid gelatinous substance composed of petroleum derivatives and a metal soap, which is used for indoor lubrication:
Greases have high adhesion and suitable temperature and should be used for each special grease device and one of the most important quality factors of grease is the type of soap and the type of thickener.
Types of greases: Greases are divided into 9 types based on the degree of viscosity.
Lubricants are also named according to the NLGI standard, and of course the type of grease used, additives used, the type of base, the degree of NLGI grease, the maximum and minimum operating temperature.
Grease = Metal Soap + Lubricant
In general, grease does not cool the devices during operation and has less permeability. They are absorbent in terms of maintenance, moisture and dust.