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  • One of the most significant benefits of lithopone is its non-toxic nature. In an era where health and safety standards are paramount, the use of non-hazardous additives is crucial In an era where health and safety standards are paramount, the use of non-hazardous additives is crucial In an era where health and safety standards are paramount, the use of non-hazardous additives is crucial In an era where health and safety standards are paramount, the use of non-hazardous additives is cruciallithopone for rubber. Lithopone is lead-free, making it a safe alternative to traditional lead-based pigments that pose environmental and health risks. This feature ensures that rubber products containing lithopone are compliant with stringent international regulations and industry standards.

  • 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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