Zinc Chloride
Title: Zinc Chloride
CAS Registry Number: 7646-85-7
Additional Names: Butter of zinc
Molecular Formula: Cl2Zn
Molecular Weight: 136.32
Percent Composition: Cl 52.01%, Zn 47.98%
Line Formula: ZnCl2
Literature References: Usually contains at least 95% ZnCl2; remainder is chiefly water and oxychloride. Toxicity: Bruner, Fed. Proc. 9, 260 (1950).
Properties: White, odorless, very deliquesc granules, or fused pieces or rods. d25 2.907; mp ~290°; bp 732°. Solubility in H2O: 432 g/100 g (25°); 614 g/100 g (100°). One gram dissolves in 0.25 ml of 2% HCl, in 1.3 ml alcohol, 2 ml glycerol; freely sol in acetone. With much water some zinc oxychloride is formed. The aq soln is acid to litmus; pH about 4. Keep tightly closed. LD i.v. in rats: 60-90 mg/kg (Bruner).
Melting point: mp ~290°
Boiling point: bp 732°
Density: d25 2.907
Toxicity data: LD i.v. in rats: 60-90 mg/kg (Bruner)
CAUTION: Potential symptoms of overexposure to fumes are conjunctivitis; irritation of skin, eyes, nose and throat; coughing, copious sputum; dyspnea, chest pain, pulmonary edema and bronchopneumonia; pulmonary fibrosis, cor pulmonale; fever; cyanosis; tachypnea; skin burns. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 338.
Use: Deodorant, disinfecting and embalming material; alone or with phenol and other antiseptics for preserving railway ties; fireproofing lumber; with ammonium chloride as flux for soldering; etching metals; manuf parchment paper, artificial silk, dyes, activated carbon, cold-water glues, vulcanized fiber; browning steel, galvanizing iron, copper-plating iron; in magnesia cements; petroleum oil refining; cement for metals and for facing stone; mordant in printing and dyeing textiles; carbonizing woolen goods; producing crepe and crimping fabrics; mercerizing cotton; sizing and weighting fabrics; vulcanizing rubber; solvent for cellulose; preserving anatomical specimens; in microscopy for separating silk, wool, and plant fibers; as dehydrating agent in chemical syntheses. Dentin desensitizer.
Therap-Cat: Astringent.
Therap-Cat-Vet: Antiseptic, astringent. Has been used in ulcers, fistulas, pododermatitis.
Keywords: Astringent.

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