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Lithopone (CAS 1345-05-7) is a co-precipitate of Zinc Sulfide and Barium Sulfate. It offers excellent whiteness and good hiding power at a fraction of the cost of Titanium Dioxide. It is widely used in interior paints, primers, rubber goods, and linoleum. Listings specify the Zinc Sulfide (ZnS) content, typically 28% or 30%.
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Generally considered non-toxic. Dust may cause mechanical irritation to eyes and lungs. Incompatible with strong acids (releases H2S gas).
Lithopone is much cheaper but has less hiding power (opacity) and lower UV stability than TiO2. It is perfect for interior applications where cost is the primary concern.
No. Zinc Oxide is ZnO. Lithopone is a mixture of Zinc Sulfide and Barium Sulfate. Lithopone is more 'white' but Zinc Oxide has better antimicrobial and UV properties.
Generally not recommended for exterior paints as it can 'chalk' or yellow over time when exposed to heavy UV light and weather.
These are common Chinese industry codes for 30% Lithopone (B301) and specialized treated grades (B311).