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Cobalt is a chemical element with symbol Co and atomic number 27.
C 7659 (OTTO) Cobalt sputtering target, diam. x thickness 2 inch x 1 mm, 99.99% Cas 7440-48-4 - used in electroplating for its attractive appearance, hardness, resistance to oxidation it is used as a base primer coat for porcelain enamels.