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Aluminium is the third most abundant element in the Earth's crust (after oxygen and silicon) and its most abundant metal.
A 3459 (OTTO)Aluminium sputtering target, diam. x thickness 25.4mm (1.0in) x 1 mm , 99.9% Cas 7429-90-5 - used extensively in geochemical laboratories to provide a barrier for the geochemist, and for sample storage.