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If you mean ceramic bearings I think the most common materials are silicon carbide or silicon nitride.
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So what actually is it?
Non metallic, non organic, very hard shit, like Silicon Nitride, above.
The class of material is simply 'ceramic' but that term covers a whole load of materials and applications from the stuff you eat off to stuff that goes in to armor etc.
Colonel_of_Truth
Howard
@fizzy.bleach
So what actually is it?