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Moreover, TIO2's contribution extends beyond color enhancement. It introduces a corrosion-resistant barrier within paints, safeguarding underlying surfaces from the detrimental effects of moisture, chemicals, and UV radiation. This protective quality is of paramount importance for exterior applications, where exposure to environmental elements is inevitable. In architectural paints, for instance, the inclusion of TIO2 not only beautifies structures but also prolongs their lifespan by combating weathering In architectural paints, for instance, the inclusion of TIO2 not only beautifies structures but also prolongs their lifespan by combating weathering In architectural paints, for instance, the inclusion of TIO2 not only beautifies structures but also prolongs their lifespan by combating weathering In architectural paints, for instance, the inclusion of TIO2 not only beautifies structures but also prolongs their lifespan by combating weatheringchina tio2 used in paint.

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Having thus described the origin and uses of the pigment, we now come to the question, what is lithopone? It is, in short, a chemical compound usually consisting of 30.5 per cent zinc sulphide, 1.5 per cent zinc oxide and 68 per cent barium sulphate, but these proportions vary slightly in the different makes. Lithopone of this composition is sold as the highest grade, either as red seal or green seal, as it best suits the idea of the manufacturer. Many manufacturers, especially in Europe, sell and also export other brands under other seals, containing 24, 20, 18 and as little as 12 per cent of zinc sulphide with very small percentages of zinc oxide, the balance being usually barium sulphate, but sometimes certain portions of China clay or gypsum (calcium sulphate) or whiting (calcium carbonate). Such brands are not a chemical compound, but mechanical mixtures of the chemically compounded lithopone and the admixtures referred to.

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Although barium sulfate is almost completely inert, zinc sulfide degrades upon exposure to UV light, leading to darkening of the pigment. The severity of this UV reaction is dependent on a combination of two factors; how much zinc sulfide makes up the pigments formulation, and its total accumulated UV exposure. Depending on these factors the pigment itself can vary in shade over time, ranging from pure white all the way to grey or even black. To suppress this effect, a dopant may be used, such as a small amount of cobalt salts, which would be added to the formulation. This process creates cobalt-doped zinc sulfide. The cobalt salts help to stabilize zinc sulfide so it will not have as severe a reaction to UV exposure.

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