Lubricating Greases_2
Grease is a semi-solid lubricant consisting of a base oil and a thickener . The main types and general properties of grease are shown in the table. In general, different brands of grease must not be mixed. Mixing grease with different types of thickeners may destroy its composition and physical properties. Even if the thickeners are of the same type, possible differences in the additives may cause detrimental effects.
Part 1 | Part 2 | Part 3
| Name(Popular name) |
Sodium grease(Fiber Grease) |
Calcium grease(Cup Grease) |
Mixed base grease |
| Thickener |
Na soap |
Ca soap |
Na + Ca soaps
Li + Ca soaps, etc. |
| Base oil |
Mineral oil |
Mineral oil |
Mineral oil |
| Dropping point, °C |
170~210 |
70~90 |
160~190 |
| Working temperatures, °C |
-20~+130 |
-20~+60 |
-20~+80 |
| Working speed, %( 1 ) |
70 |
40 |
70 |
| Mechanical stability |
Good |
Poor |
Good |
| Pressure resistance |
Fair |
Poor |
Fair to Good |
| Water resistance |
Poor |
Good |
Poor for Na soap grease |
| Rust prevention |
Poor to Good |
Good |
Fair to Good |
| Remarks |
Long and short fiber types are available. Long fiber grease is unsuitable for high speeds. Attention to water and high temperature is required. |
Extreme pressure grease containing high viscosity mineral oil and extreme pressure additives (Pb soap, etc.) has high pressure resistance. |
Often used for roller bearings and large ball bearings. |
Note
1. The values listed are percentages of the limiting speeds given in the bearing tables.
Remarks: The grease properties shown here can vary between brands.
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