Viscosity is a determinant of lubrication modes: Oil film thickness and friction loss. 1 . If the oil is too viscous: Impedance increased Abrasive on startup Poor circulation 2. If the oil has a small viscosity: Easily pushed away from lubrication surface Poor adhesion ability Lubricating oil loss

Viscosity index is a change in viscosity with temperature: Viscosity decreases rapidly with increasing temperature Ex: Parafinique mineral oil, viscosity decreased 7 times when increasing T from 60 to 120 degrees C. The decrease in viscosity as the temperature increases depends on the chemical structure of the oil. Viscous type Viscosity index (VI) Application range […]

1. Acidity The acids are present in oil in the form of: Organic acids Inorganic acid Due to additives in new oil 2. Alkalinity: The alcaline is added and in the new oil to neutralize the products produced by the oxidation of the oil when used. 3. Acid and alkali index: Acid index (AN, TAN): […]

What is the flash point: It is the temperature at which the amount of steam released from the surface of the lubricant sample will ignite when a flame is introduced. The lowest temperature at which steam from a lubricant sample continues to burn for 5 seconds is called the ignition point. Evaluation of lubricant composition […]