standard Grease is a solid and semi-solid gelatinous substance composed of petroleum derivatives and a metal soap, which is used for indoor lubrication

NLGI = National Lubricating Grease Institute.

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.