The main performance indicators of lubricating oil:
Viscosity, Viscosity Index, Density and Specific Gravity, Pour Point, Flash Point, Demulsibility, Air Release, Fire Point, Foaming, Oxidative Stability, Neutralization Value, Corrosion, Rust Resistance Test, Pour Point Test, Copper Plate Corrosion testing, flash point testing, abrasion resistance and extreme pressure testing.
1. Viscosity
Viscosity is the most important single performance index of lubricating oil, it is the main factor to form lubricating film, which determines the bearing capacity of lubricating oil.
Viscosity can be divided into kinematic viscosity, dynamic viscosity, Enn's viscosity, Rey's viscosity and Saybolt viscosity; among them, kinematic viscosity is the most commonly used viscosity expression for lubricating oil.
2. Viscosity index
Viscosity Index: is an experimental value used to indicate the degree of oil change with temperature. The viscosity of a liquid decreases with increasing temperature, and the higher the viscosity index, the less the oil changes with temperature.
3. Density and specific gravity
The density of a liquid usually refers to the mass of the liquid per unit volume (commonly used unit kg/m3) when the temperature is 15 °C; the specific gravity is also called relative density, which refers to the density of the liquid at 15 °C and the same volume of water at the same temperature. lower density ratio.
4. Pour point
The minimum temperature at which the cooled oil can flow.
5. Flash point
It is a comprehensive indicator of the fire hazard of a substance and should generally be higher than 20-30°C.
6. Anti-emulsification
Refers to the ability of oil to separate from water, also known as water separation.
7. Neutralization value
Neutralization value actually includes total acid number and total base number. However, unless otherwise noted, the "neutralization value" generally referred to actually only refers to the "total acid value", and its unit is also mgKOH/g.