World-wide use of zinc oxide is in excess of 1.8 million tons annually. On a contained zinc basis the oxide accounts for about 9% metallic zinc. Probably 60% zinc oxide uses secondary zinc, primarily top dross from continuous galvanizing, as the zinc source. Although rubber products and in particular tires are the major use for rubber, there are considerable variations around the world in use patterns. For example, the ceramic market is equally as important as rubber is some areas.