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International Lead Zinc Research Organization (ILZRO) The International Lead Zinc Research Organization (ILZRO) manages environment, health, sustainable development and product-related research programs on behalf of the International Lead Association (ILA) and the International Zinc Association (IZA).	International Zinc Association IZA is the only global industry association dedicated exclusively to the interests of zinc and its users. IZA helps sustain the long-term global demand for zinc by promoting end uses as corrosion protection and the essentiality of zinc in human health.