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Aluminum Monostearate


Aluminum monostearate is an aluminum compound of stearic acid and palmitic acid. The USP32–NF27 states that aluminum monostearate contains the equivalent of not less than 14.5% and not more than 16.5% of Al2O3, calculated on the dried basis. The JP XV states that it contains not less than 7.2% and not more than 8.9% of aluminium. Aluminum monostearate occurs as a white, fine, bulky powder with a slight odor of fatty acid. It is a solid material.

Nonproprietary Names
  • JP: Aluminum Monostearate
  • USP-NF: Aluminum Monostearate
Emollient; emulsion stabilizer; gelling agent; opacifier; stabilizing agent.

Synonyms

Aluminum stearate; aluminum, dihydroxy (octadecanoate-O-); dihydroxyaluminum monostearate; HyQual; octadecanoic acid aluminum salt; stearic acid aluminum salt; stearic acid aluminum dihydroxide salt; Synpro.

Chemical Name and CAS Registry Number


Aluminum monostearate [7047-84-9]

Empirical Formula and Molecular Weight

C18H37AlO4 344.50

Structural Formula

[CH3(CH2)16COO]Al(OH)2

Functional Category

Emollient; emulsion stabilizer; gelling agent; opacifier; stabilizing agent.

Applications in Pharmaceutical Formulation or Technology





Aluminum monostearate is mainly used in microencapsulation and in the manufacture of ointments. Aluminum monostearate is used as a viscosity-increasing agent in nonaqueous cosmetic and pharmaceutical formulations. In addition, aluminum monostearate can be used as an emulsion stabilizer in cosmetic emulsions and is used in cosmetics such as mascara, moisturizers, and sunscreens.

Method of Manufacture
Aluminum monostearate is prepared by reacting aluminum with stearic acid.

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