Title: Zinc Stearate
CAS Registry Number: 557-05-1
CAS Name: Octadecanoic acid zinc salt
Molecular Formula: C36H70O4Zn
Molecular Weight: 632.35
Percent Composition: C 68.38%, H 11.16%, O 10.12%, Zn 10.34%
Line Formula: Zn(C18H35O2)2
Literature References: Usually occurs as a mixture of the zinc salts of stearic and palmitic acids, and usually with some excess of zinc oxide. Contains 13.5-15% ZnO. Prepd from stearic acid and zinc chloride: Vold, Hattiangdi, Ind. Eng. Chem. 41, 2311 (1949).
Properties: Fine, soft, bulky powder; slight characteristic odor; neutral reaction. Repels water. mp about 120°. Insol in water, alcohol, ether. Sol in benzene; dec by dil acids.
Melting point: mp about 120°
CAUTION: Potential symptoms of overexposure are irritation of eyes, skin, upper respiratory system; cough. See NIOSH Pocket Guide to Chemical Hazards (DHHS/NIOSH 97-140, 1997) p 338.
Use: In tablet manuf; in cosmetic and pharmaceutical powders and ointments; as a flatting and sanding agent in lacquers; as a drying lubricant and dusting agent for rubber; as a plastic mold releasing agent; as a waterproofing agent for concrete, rock wool, paper, textiles.
Therap-Cat-Vet: Antiseptic, astringent, protective (topical).