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Zinc is the 24th most abundant element in the Earth’s crust and the fourth most widely used metal. It is a non-toxic, water-soluble and flame retardant material that exhibits good biodegradability and excellent corrosion resistance. zinc hydrogen phosphate is a novel condensed form of zinc which has the potential to provide new functional materials. It is obtained by treating sulfidic zinc oxide with concentrated sulfuric acid, and it has been found to have many applications.
It can be used as a non-toxic anti-rust pigment and water-soluble white paint, as a base for non-toxic phenolic and epoxy resins, and also in manufacturing dental impression materials. It is also a promising candidate for the production of alumina-based catalysts due to its good stability and high temperature tolerance. Zinc has been used as a biocatalyst for the depolymerization of polyvinyl chloride, and it is an important raw material for producing non-toxic anti-corrosion coatings. It can be oxidized at high temperatures in air to yield white triclinic crystals or a crystalline powder that is mildly acidic and volatile.
The powder smoothness of the resulting pigments is an important factor for cosmetic application; however, small particle sizes have a major shortcoming in that they may penetrate the pores of the skin. In this study, the powder smoothness was evaluated by measuring the MIU and MMD values of the samples prepared with different phosphate sources. The MIU and MMD values of all samples were less than 0.6 and smaller than 0.04, respectively, suggesting that the phosphate-based pigments were suitable for cosmetic use.