What makes graphite grease special?
The characteristics of graphite grease are determined by the properties of the graphite powder it contains. Graphite is distinguished by the fact that its molecules bond well to metal oxides and bond weakly to one another. Thanks to this, graphite creates a slippery film on the surface that withstands high loads and at the same time is not rubbed off the metal surface. Moreover, even if the grease begins to break down under the action of high loads and temperature, the graphite remaining on the surface of the rubbing parts continues to perform its function, acting as a dry lubricant. Graphite grease can therefore act both as a separating lubricant, preventing parts from “sticking” to one another, and as a friction lubricant, significantly reducing the friction force between parts. Because graphite holds well on the metal surface and has dirt-repellent properties, the grease also creates a kind of anti-corrosion coating, protecting the surface from atmospheric influences. Graphite has high electrical conductivity, so graphite grease can be used to protect battery terminals from corrosion without fear that the grease itself will create high electrical resistance.
Where can graphite grease be used?
Graphite grease is used in heavily loaded low-speed mechanisms working in the open air, for example gear drives, cables, threaded joints, the lead screws of hoists and jacks, leaf springs, tractor fifth wheels, and to protect battery terminals. It can also be used to lubricate firearms. Thanks to the aerosol packaging the grease has good penetrating ability, so it is effective for treating chains and garage door hinges.
Can graphite grease be used in rolling bearings and precision mechanisms?
Graphite grease must not be used in rolling bearings and precision mechanisms. The reason is that the coarsely ground graphite contained in the grease, which also carries mechanical impurities, very quickly wears and damages rubbing surfaces with a high surface finish.
Do surfaces need to be cleaned before graphite grease is applied to them?
If graphite grease is applied to an uncleaned surface, there is a risk that it will not reach the metal surface and will be removed together with the dirt under mechanical action. Therefore, so that the graphite is firmly retained on the lubricated parts, it is recommended to clean the surface before applying graphite grease to it.