Summary: The majority of commercial lithium grease*) is designed for the lubrication of bearings, joints and other friction mechanisms operating within the conditions of high pressure and fast revs in the temperature range from - 20°C to 120 (130)°C.
The lithium greases are smooth, with gelled and oily structure. It consists of base oil, having a viscosity of 100 cSt (at 40°C), thickened with lithium 12 -hydroxystearic lithium soap (often noted as lithium 12 - hydroxystearate).
The commercial lithium grease is much more popular than others. It has dropping point temperature between 197°C and 204°C and can be used in a temperature range from -20°C to about 120-130°C, but no more. It has good shear stability and a relatively low friction coefficient, which allows the higher operational speed of the mechanisms. It has good water resistance, but not as good as those of calcium and aluminum grease. The pumpability and its colloidal stability are good to excellent. It is not a corrosion inhibitor by its nature, but with appropriate additives that can be improved significantly. Antioxidants and EP /extreme pressure/ additives are also important for the properties of lithium greases. The industry is the biggest consumer of lithium grease. Predominant are manufacturing, steel and mining industries. In transport, most grease is used in rail transport, trucks and buses, followed by agricultural machinery and cars. The most commonly used is lithium EP2 grease, followed by multipurpose grease NLGI 3 and NLGI 2. Rust LLC offers multipurpose, EP, molybdenum and semi fluid grease for lubrication of heavy trucks and machinery. They are thickened with soap thickener - lithium 12 - hydroxystearat and a second polymeric thickener, which usually increases the adhesion to metal surfaces (grease becomes sticky), resists the break the oil film and although not so significantly, improves the high-temperature characteristics and water-resistance properties of the grease. The lithium grease is very sensitive to impurities. According to our experience, it is a bad idea to mix multipurpose with complex /high-temperature/ greases, and also said multipurpose with some strange modifications imported from abroad and distinguished mainly by their low prices. This statement is based on our practical observations. The Internet has many sources who claim that such mixing is permissible, but our opinion is not so. It is desirable before lubrication to clean thoroughly the old grease, especially if the new one has a different structure (eg. ordinary -> high temperature). If this is not possible, the subsequent relubrication should be done in a much shorter period. Another aspect is the sensitivity of the lithium grease to oxidized oils and other chemical impurities. So far, this grease covers no more than 70% of practical needs. For additional information, please make an inquiry to us.
The greases L24, Uniel and Uniel EP are designed for lubrication of sliding and rolling bearings
and other mechanisms under moderate loads. MS2 grease with molybdenum disulfide is designed for
lubrication under high loads and work in harsh and humid environments. Operating temperature range
from -20°C to 120°C.
*) The greases are plastic lubricants, as far as the lubricants are gaseous, liquid, grease-like or solid. The term "grease" is the most widely used, as it means dispersions, having a wide range of properties. Another commonly used term, "consistent", is used incorrectly.