FLUOROELASTOMER COMPOSITION

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A (per)fluoroelastomer composition having improved plasma resistance comprising at least one (per)fluoroelastomer [fluoroelastomer (A)] and from 0.1 to 50 weight parts per 100 parts by weight of said fluoroelastomer (A) of alkaline-earth metal carbonate particles [particles (P)]. Each particle comprises a core consisting essentially of at least one alkaline-earth metal carbonate and a shell consisting essentially of at least one Group IV transition metal compound.