Zinc stearate

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Soft, fine, white, waxy powder. Zinc stearate normally occurs as a mixture of the zinc oxide with zinc salts of stearic and palmitic acids. It is used in cosmetic and lacquer as a flatting agent. It is also used as a lubricant on the surface of rubbers and as a release agent on plastic molds. Zinc stearate has also found uses as a waterproofing agent for concrete, rock wool, paper, and textiles.

Synonyms and Related Terms

octadecanoic acid zinc salt




  • Combustible. Flash point = 277C
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in benzene. Insoluble in water, alcohol, ether.

Composition ZnC36H70O4
CAS 557-05-1
Melting Point 130 C
Density 1.1 g/ml
Molecular Weight mol. wt. = 632.33

Resources and Citations

  • The Merck Index, Susan Budavari (ed.), Merck Research Labs, Whitehouse Station, NJ, 12th Edition, 1996 Comment: entry 9965