Classified according to the material form of the lubricant
Gas lubrication Some inert gases such as air, steam or helium are used as lubricants to separate the friction surfaces by high-pressure gas.
| STE0100W150N | RAE0063P025N | RIE0090F002N |
| STE0160W150N | RAE0120P025N | RIE0120F002N |
| STE0250W150N | RAE0160P025N | RIE0170F002N |
| STE0400W150N | RAE0250P025N | RIE0230F002N |
For example, inertial gyroscopes used in navigation; thrust bearings of vertical turbines in heavy machinery; rotating supports of large astronomical telescopes; bearings of high-speed grinding heads, etc. can be lubricated with gas.

The biggest advantage of gas lubrication is that the friction coefficient is extremely small, almost close to zero. The viscosity of the gas is not affected by the temperature, so the gas-lubricated bearing has low resistance and high precision.
Liquid lubrication The reducer, gear seat, precision oil film bearing, etc. of the rolling mill are all lubricated with liquid lubricants of different viscosities and properties. Liquid lubricants include mineral oils, synthetic oils, and emulsified oils. Water can also be used as a lubricant and coolant for the blooming mill bakelite bearings.
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