Lithopone

Lithopone is a mixture of 30% zinc sulfide and 70% barium sulfate, precipitated simultaneously. It is used mainly in cheaper white or coloured compounds as a whitening agent [3]. 

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Zinc oxide or zinc white is used in paints, but more preferable, because of its better covering power, is lithopone (a mixture of zinc sulphide and barium sulphate). Both paints have the advantage over white lead that they do not blacken in air (due to hydrogen sulphide). Zinc dust and also zinc chromate are constituents of... 

Zinc is also used extensively to galvanize other metals such as iron to prevent corrosion. Zinc oxide is a unique and very useful material for modern civilization. It is widely used in the manufacture of paints, rubber products, cosmetics, pharmaceuticals, floor coverings, plastics, printing inks, soap, storage batteries, textiles, electrical equipment, and other products. Lithopone, a mixture of zinc sulfide and barium sulfate, is an important pigment. 

Lithopone [8006-32-4] an important white pigment, is produced mainly in the former Soviet Union, the C2ech RepubHc, and the People s RepubHc of China. In China, the nation s output for Hthopone peaked in 1990 at about 233,000 t. In 1992 it was only 168,000 t. About one-third of the Hthopone produced in China was exported. Annual worldwide production can be estimated to be under 250,000 t as of this writing (ca 1995) (18) (see Barium... 

Llthopone. Lithopone is a mixture of ZnS and BaSO. The pigmentary properties of the mixture are deterrnined by 2inc sulfide and therefore Hthopone pigments are characteri2ed by the amount of ZnS present in the mixture. The amount of ZnS in commercial Hthopones varies from 15 to 60%. The most common is a 30% Hthopone pigment, containing 28—30% of ZnS and 70—72% of BaSO. ... 

Production. Commercial production of Hthopone started in the first half of the nineteenth century, and continued to grow until the middle of the twentieth century when titanium dioxide started to dominate the white, inorganic pigment market. Lithopone is prepared by combining barium sulfide and 2inc sulfate solutions at 50—60°C ... 

Use. Lithopones are used in water-based paints because of their excellent alkaH resistance, in paper manufacturing as a filler and opacifying pigment, and in mbber and plastics as a whitener and reinforcing agent. 

FIG. 5-12 Variation of absorptivity with temperature of radiation source. (1) Slate composition roofing. (2) Linoleum, red brown. (3) Asbestos slate. (4) Soft rubber, gray. (5) Concrete. (6) Porcelain. (7) Vitreous enamel, white. (8) Red brick. (9) Cork. (10) White dutch tile. (11) White chamotte. (12) MgO, evaporated. (13) Anodized aluminum. (14) Aluminum paint. (15) Polished aluminum. (16) Graphite. The two dashed lines bound the limits of data on gray paving brick, asbestos paper, wood, various cloths, plaster of parts, lithopone, and paper. To convert degrees Ranldne to kelvins, multiply by (5.556)(10 ). 

Cellulose acetate Silica gel Scoured wool Sawdust Rayon waste Fluorspar Tapioca Breakfast food Asbestos fiber Cotton linters Rayon staple Starch Aluminum hydrate Kaolin Cryolite Lead arsenate Cornstarch Cellulose acetate Dye intermediates Calcium carbonate White lead Lithopone Titanium dioxide Magnesium carbonate Aluminum stearate Zinc stearate Lithopone Zinc yellow Calcium carbonate Magnesium carbonate Soap flakes Soda ash Cornstarch Synthetic rubber... 

A violent explosion of Picric Acid in a Manchester factory in 1887 was ascribed to the formation of picrates. Burning, molten Picric Acid flowed down onto lithopone, forming lead picrate which in consequence caught fire. The latter, being an initiator, detonated and caused the Picric Acid to detonate... 

C04-0121. Lithopone, a brilliant white pigment used in paints, paper, and white rubber products, is a mixture of two insoluble Ionic solids, ZnS and BaSOq. Suggest how 1.0 kg of lithopone could be prepared by a precipitation reaction. 

Slow addition of zinc white (a voluminous oxide containing much air) to cover the surface of linseed oil varnish caused generation of heat and ignition. Lithopone, a denser (air-free) grade of oxide did not cause heating. 

A catalyst made from the metal lithium and used in the preparation of stereo specific polymers. Lithopone... 

Lithopone is a mixture of zinc sulphide and barium sulphate in equimolecular proportions. It is used to establish a white base for coloured compounds. 

Lithopone, a commonly used pigment containing barium sulfate and zinc sulfide, is produced by the following reaction ... 

White pigments, some of rather variable composition, that have been used in the past include white lead (Cl Pigment White 1), refractive index 1.9 zinc oxide (Cl Pigment White 4), r.i. 1.9 lithopone (Cl Pigment White 5), r.i. 1.84 zinc sulphide (Cl Pigment White 7), r.i. 2.3 antimony oxide (Cl Pigment White 11), r.i. 2.2. All have been eclipsed by titanium dioxide (Cl Pigment White 6). 

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