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Solid lubricants
Solid lubricants may only be used after prior consultation with SKF. When solid lubricants are used in lubrication systems,
the following rules generally apply:
Graphite:
• Maximum graphite content 8%
• Maximum grain size 25 µm (preferably in lamellar form)
MoS2:
• Maximum MoS2 content 5%
• Maximum grain size 15 µm
Copper:
• Lubricants containing copper are known to lead to coatings forming on pistons, bore holes, and mating surfaces. This
can result in blockages in the centralized lubrication system.
Calcium carbonate:
• Lubricants containing calcium carbonate are known to lead to very heavy wear on pistons, bore holes, and mating
surfaces.
Calcium hydroxide:
• Lubricants containing calcium hydroxide are known to harden considerably over time, which can lead to failure of the
centralized lubrication system.
PTFE, zinc, and aluminum:
• For these solid lubricants, it is not yet possible to define any limit values for use in lubrication systems on the basis of
existing knowledge and practical experience.
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