Title: Zinc Oxide
CAS Registry Number: 1314-13-2
Additional Names: Flowers of zinc; philosopher's wool; zinc white; C.I. Pigment White 4; C.I. 77947
Molecular Formula: OZn
Molecular Weight: 81.41
Percent Composition: O 19.65%, Zn 80.35%
Line Formula: ZnO
Literature References: Occurs as the mineral zincite. Prepd by vaporization of metallic zinc and oxidation of the vapors with preheated air (French process); also from franklinite, (American process) or from zinc sulfide: Faith, Keyes & Clark's Industrial Chemicals, F. A. Lowenheim, M. K. Moran, Eds. (Wiley-Interscience, New York, 4th ed., 1975) pp 882-888. Purification: Depew, US 2372367 (1945 to American Zinc, Lead & Smelting). The medicinal grade contains 99.5% or more ZnO; technical grades contain 90-99% ZnO and a few tenths of 1% of lead. See also: Colour Index vol. 4 (3rd ed., 1971) p 4687. Efficacy as sunblock: S. R. Pinnell et al., Dermatol. Surg. 26, 309 (2000).
Properties: White or yellowish-white, odorless powder. Hexagonal crystals: d 5.67. Also reported as d420 5.607. Sublimes at normal pressure. nD 2.0041, 2.0203. American process zinc oxide pH 6.95. French process zinc oxide pH 7.37. Practically insol in water. Sol in dil acetic or mineral acids, ammonia, ammonium carbonate, fixed alkali hydroxide solns.
Index of refraction: nD 2.0041; 2.0203
Density: d 5.67; d420 5.607
Derivative Type: Calamine
Trademarks: Eczederm (Quinoderm)
Literature References: Zinc oxide with a small proportion of ferric oxide as a coloring agent.
Properties: Pink powder. Insol in water. Almost completely sol in mineral acids.
CAUTION: Potential symptoms of overexposure are metal fume fever (chills, muscle aches, nausea, fever, dry throat, cough, weakness, lassitude); metallic taste; headache; blurred vision; low back pain; vomiting; fatigue; malaise; tight chest, dyspnea, rales, decreased pulmonary function. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 338.
Use: As pigment in white paints instead of lead carbonate; in cosmetics, driers, quick-setting cements; with syrupy phosphoric acid or ZnCl2 in dental cements; manuf opaque glass and certain types of transparent glass; manuf enamels, automobile tires, white glue, matches, white printing inks, porcelains, zinc green; as a reagent in analytical chemistry; in electrostatic copying paper; as flame retardant; in electronics as semiconductor.
Therap-Cat: Astringent; topical protectant; ultraviolet screen.
Therap-Cat-Vet: Antiseptic; astringent; topical protectant.
Keywords: Astringent; Topical Protectant; Ultraviolet Screen. |