Chinese lubricant standards

Mineral lubricant base oil is also called neutral oil. The viscosity grade of neutral oil is expressed in Saybolt viscosity (seconds) at 37.8°C (100), and is marked as 10ON, 15ON, 5OON, etc.; while the high-viscosity oil obtained from residual oil is called bright oil , expressed in 98.9 (210) Saybolt viscosity (seconds), such as 150BS, 120BS, etc. Since the 1970s, my country has formulated three neutral oil standards, namely paraffin-based neutral oil, intermediate-based neutral oil and naphthenic-based neutral oil, which are marked with SN, ZN and DN respectively. For example: 75SN, 100SN, 15OSN, 200SN, 350SN, 500SN, 650SN and 150BS. However, the degree of SN oil is based on the movement degree of 40℃, and BS is divided into 100 degrees of movement. The specifications and standards of these neutral oils have been It has been implemented in China for a period of time and has played a role in promoting and improving the overall lubricant production technology.

Since the 1990s, Sinopec has classified neutral oil into UHVI (ultra-high viscosity index, viscosity index >140) and VHVI (very high viscosity index) according to the internationally accepted neutral oil classification method and based on the properties and viscosity index of domestic crude oil. There are four categories: viscosity index, viscosity index > 120), HV (high viscosity index, viscosity index > 80), MVI (medium viscosity index, viscosity index 40 to 80) and LVI (low viscosity index, viscosity index < 40). In addition, based on the property requirements of neutral oils for high-grade oils such as long-span multi-grade internal combustion engine oils, hydraulic transmission oils, and high-performance extreme pressure industrial gear oils, two types of deeply refined neutral oil standards, HVIS and MVIS, have been formulated. , and two types of deeply dewaxed neutral oil standards, HVIW and MVIW. The oxidation stability, anti-emulsification, evaporation loss and pour point of these neutral oils all have higher requirements than the previous neutral oils. HVI high viscosity index neutral oil, with a viscosity index of not less than 95. Used to prepare lubricants with higher viscosity and temperature performance requirements. The viscosity grades are HVI-75, HVI-100, HVI-150, HVI-200, HVI-350, HV-400, HV1-500 and HIV-650 and two HVI-120BS and HVI-150BS bright oils, MVI is medium Viscosity index neutral oil. The viscosity index is not less than 60.Suitable for formulating lubricants with low viscosity and temperature performance requirements. The viscosity grades are: MVI-60, MVI-75.MVI-100, MVI-150, MVI-250, MVI-500, MVI-600, MVI-750, MVI-900 and MVI-9OBS, MVI125/140BS and MVI- 200/220BS three bright oils. LVI is a low viscosity index neutral oil. No minimum viscosity index is specified. Suitable for preparing low pouring point lubricants such as transformer oil and refrigeration oil. The viscosity grades are: LVI-60. LVI-75, LVI-100, LVI-150, LVI-300, LVI-500, LV-900, LVI-1200 and two bright oils: LVI-90BS and LV-230/250BS. HVIS high viscosity index deeply refined neutral oil, in addition to the viscosity index greater than 95, also has excellent oxidation stability, anti-emulsification and certain evaporation loss indicators. Suitable for blending high-grade steam turbine oil and extreme pressure industrial gear oil. Its viscosity grade corresponds to HVI neutral oil.

HVIW is a high viscosity index, low pour point and low volatility neutral oil. In addition to a viscosity index greater than 95, it also stipulates a lower freezing point, lower evaporation loss and good oxidation stability. Suitable for blending high-grade internal combustion engine oil, low-temperature hydraulic oil, hydraulic transmission fluid, etc. Its viscosity grade corresponds to HVI neutral oil.

MVIS is a highly refined neutral oil with a medium viscosity index. In addition to a viscosity index of not less than 60, it also has good oxidation stability and anti-emulsification properties. Suitable for blending turbine oil, etc.

Its viscosity grade corresponds to MVI neutral oil.

MVIW is a neutral oil with medium viscosity index, low freezing point and low volatility. In addition to its viscosity index not less than 60, it also has good oxidation stability, anti-emulsification and evaporation loss. Suitable for blending internal combustion engine oil, low-temperature hydraulic oil, etc.