Title: Barium Sulfate
CAS Registry Number: 7727-43-7
Additional Names: Blanc fixe
Trademarks: Baritop (Sakai); Barosperse (Mallinckrodt); Esophotrast (RPR); E-Z-Paque (E-Z-Em); Intestibar (Spofa); Micropaque (Guerbet); Microtrast (Guerbet); Mixobar (Byk Gulden); Neobar (Merck KGaA); Oratrast (RPR); Prontobario (Bracco); Radiopaque (Schering AG); Telebar (Guerbet); Tixobar (Astra)
Molecular Formula: BaO4S
Molecular Weight: 233.39
Percent Composition: Ba 58.84%, O 27.42%, S 13.74%
Line Formula: BaSO4
Literature References: Occurs in nature as the mineral barite; also as barytes, heavy spar. Prepn: Gmelins, Barium (8th ed) 30, 262-267 (1932) and supplement, 182-186, 412-414 (1960). Review of clinical use: R. F. Theoni, A. R. Margulis, Radiology 167, 7 (1988).
Properties: Fine, heavy, odorless powder or polymorphous crystals, d 4.25-4.5. Dec above 1600°. Practically insol in water (one gram dissolves in 400,000 parts), dil acids, alc. Sol in hot concd H2SO4.
Density: d 4.25-4.5
CAUTION: Potential symptoms of overexposure by direct contact are irritation of eyes, nose and upper respiratory system; inhalation may cause benign pneumoconiosis. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 24.
Use: Manuf photographic papers, artificial ivory, cello-phane; filler for rubber, linoleum, oil cloth, polymeric fibers and resins, paper, lithographic inks; as a water-color pigment for colored paper, in wallpaper; as a size for modifying the colors of other pigments; in heavy concrete for radiation shield.
Therap-Cat: Diagnostic aid (radiopaque medium).
Therap-Cat-Vet: X-ray contrast medium.
Keywords: Diagnostic Aid (Radiopaque Medium).