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T 6062 (OTTO) Tantalum(IV) carbide, ≤5 μm Cas 12070-06-3 - used in tungsten carbide. T 6062 (OTTO) Tantalum(IV) carbide, ≤5 μm Cas 12070-06-3 - used as a coating for steel moulds in the injection moulding of aluminum alloys.