Zinc Stearate USP

Zinc stearate is a “zinc soap” that is widely used industrially. In this context, soap is used in its formal sense, a metal “salt” of a fatty acid. It is a white solid that repels water. It is insoluble in polar solvents such as alcohol and ether but soluble in aromatic hydrocarbons (e.g., benzene) and chlorinated hydrocarbons when heated.


It is the most powerful mold release agent among all metal soaps. It is widely used as a release agent for the production of many kinds of objects: rubber, polyurethane, polyester processing system, powder metallurgy. These applications exploit its “non-stick” properties. In cosmetics, zinc stearate is a lubricant and thickening agent used to improve texture. Being lipophilic, it functions as a phase transfer catalyst for the saponification of fats


Chemical Name: Zinc Stearate
CAS No.: 557-05-1


General Specifications:

Test Specification
Characters It appears as a fine, white, bulky powder, free from grittiness with faint characteristic odor.





(a) Specified test for Zinc. A portion of the water layer meets the requirements.

(b) Specified Test for Congealing Temperature. The fatty acids congeal at a temperature not below 54°.

Solubility Insoluble in water, alcohol and in ether
Arsenic Not more than 1.5ppm
Lead Not more than 10 ppm
Alkalies and alkaline earths Not more than 1%
Residual solvents Meets the requirements
Assay Not less than 12.5% and not more than 14.0% of ZnO.


Shelf life, Storage and Packing

It should be stored in a segregated area in a cool and ventilated place away from combustible materials. Keep in a tightly closed container, sealed until ready for use. It is packed in 25kg or 50kg HDPE bags or drums as required.


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We observe WHO Good manufacturing practice and Good laboratory practice.

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