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What is titanium dioxide? Why is it used in food products?
Lithopone is chemically inert and practically insoluble in acids, alkalis and solvents. The optimized particle-size distribution of Lithopone attained by means of co-precipitation and calcining permit the achievement of a high apparent density, which imparts to Lithopone its low resin requirement and its excellent rheological behaviour.
This route affords a product that is 29.4 wt % ZnS and 70.6 wt % BaSO4. Variations exist, for example, more ZnS-rich materials are produced when zinc chloride is added to the mixture of zinc sulfate and barium sulfide.[1]
Titanium dioxide is often used as a UV absorber and pigment in cosmetic products, such as foundations, lipsticks, creams, sunscreens and other skin care products. It helps protect the skin from the harmful effects of UV rays by blocking them, while providing a brightening effect.
- In the plastics industry, Lithopone B311 powder serves as a filler, enhancing the mechanical properties of polymers. It improves the rigidity, dimensional stability, and thermal resistance of plastic products, extending their lifespan and performance. Furthermore, it can also be used in the production of rubber goods, providing improved tensile strength and reducing the overall cost.
Barium sulfide is produced by carbothermic reduction of barium sulfate. Zinc sulfate is obtained from a variety of zinc products, often waste, by treatment with sulfuric acid.
- In the realm of product development, TIO2 pigment manufacturers are also focusing on creating specialized grades for niche applications. For instance, antimicrobial TIO2 pigments can be used in healthcare settings to prevent infection, while photocatalytic TIO2 can help in air purification systems by breaking down harmful pollutants.
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.
Above 10%, 1 kg of TiO2 should be replaced by 1.3 kg of lithopone supplier 30%, reducing the amount of polymer accordingly.
Gravimetric Determination of Titanium Dioxide in Industrial Applications
≤0.4

Food preservation and packaging
Titanium dioxide (E 171) is authorised as a food additive in the EU according to Annex II of Regulation (EC) No 1333/2008.
Asia
