A white pigment obtained naturally from the mineral barite. Barium sulfate was developed as an artist pigment in the late 18th century as a nonpoisonous alternative to lead white. Barium sulfate is an inert, transparent pigment that is often used as a filler or as a base for lake pigments. In recent years, it has also been used as a filler and extender in paper, wallpaper, linoleum, oilcloth, rubber, plastics, flannel, and shoddy cloth. Barium sulfate can also be made artificially by a process discovered in late nineteenth century. Artificially prepared barium sulfate is called blanc fixe. In order to increase its opacity, barium sulfate is mixed with zinc sulfide, to form lithopone. Permalba is an opaque version of barium sulfate which is sold as a permanent artist pigment.
Synonyms and Related Terms
baryte; Pigment White 22 (natural); Pigment White 21 (synthetic); CI 77120 (both); barium sulphate (Br.); blanc fixe (Fr.); basofor; Baryt (Deut.); Schwerspat (Deut.); Barytweiss (Deut.); solfato di bario (It.); bianco fisso (It.); blanco fijo (Esp.); sulfate de baryum (Fr.); baritis (Gr.); bariet (Ned.); sulfato de bário (Port.); artificial barite; baratine; baryta white; barium white; permanent white; Permalba; heavy spar; Bologna white; Bolognian spar; Tyrol white; cauk
Chemically resistant to acids, alkalis and corrosive gases.
Particle size = 0.11-0.54 microns. Low birefringence.
Isotropic but under cross polars the particles may appear to twinkle.
|Molecular Weight||mol. wt. = 233.43|
|Refractive Index||1.636; 1.637; 1.648|
Hazards and Safety
Nonpoisonous. Used in medical radiography because of its density and its water insolubility. Noncombustible.
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