The grease is a gelatin mixture made of oil, soap and additives. Greases, like oils, have the task of minimizing friction and wear between surfaces.
The first grease in 1400 BC was made of mixing olive oil and lime to lubricate the wheels of a wooden chariot in ancient Egypt, and then the first grease in modern form produced in 1872 with sodium .at the beginning of the industrial revolution in Europe It is now being marketed and nowadays these greases are almost obsolete and greases are being produced at various bases such as lithium, calcium, aluminum, etc.
Greases are produced by combining three essential raw material: base oil, thickener, and additives. Base Oils, 80 up to 90 % of grease made by base oil and rest is additive and thickener The choice of base fluid may be mineral oil, synthetic oil, or any fluid that provides lubricating properties.
The greases are classified according to the type of base oil and the type of thickening agent (soap), greases are classified with NLGI grades, which are of ….., 1, 2, 3, 4, 5, 6 is available, and the hardest grease has NLGT 4 and. the most soft one indicates that there is more oil in the grease.
Calcium grease :
Calcium Grease is a water-resistant mineral that is made with calcium soap base. This lubricant has soft (buttery) texture and short fibers, which is recommended for lubrication of all types of machinery at medium temperature (-70˚C to -20˚C). This product is used for lubrication of bearings, axle joints, sliding platforms and gearboxes of industrial devices. Calcium-based grease is also known as grease cup or chassis.
The grease is usually solid or semi-solid at normal temperature and ambient temperature and is divided into nine grades (grid) based on the viscosity. In the name of grease, six groups are created:
The grease is produced from a mixture of a thickener such as metal soap with a lubricant such as oil. Thickeners are a kind of hydrocarbons, which range from 50 to 60 and sometimes more than 80 carbon atoms. This is where hydrocarbon-based lubricants generally do not have more than 30 carbon atoms.
Grade NLGI DIN 51818
Structure (physical state)
influence after work
Lubrication of gears
With the help of the system
With the help of pumped grease or central pump
Lubrication of bearings
Straight to solid