Potassium stearate

Potassium stearate (CAS 593-29-3) is the potassium salt of stearic acid, commercially available under trade names including Rexanol, SPO 100, Steadan 300, and Nonsoul SK 1. It carries no assigned E-code and is registered under EC 209-786-1. Its formula is C18H36O2.K, classifying it within fatty acid salts.

In personal care formulations, potassium stearate functions as a primary emulsifier and lather-building surfactant in soap bars and creams, stabilising oil-in-water interfaces through its amphiphilic structure. In plastics processing, it acts as an internal lubricant and heat stabiliser, reducing friction between polymer chains during extrusion and delaying thermal degradation of PVC compounds.

Potassium stearate is supplied as a white powder and is available in technical and cosmetic grades compliant with REACH regulations. Procurement quantities typically range from 25 kg bags to bulk sacks. Buyers should confirm grade suitability against FCC or Ph.Eur. standards depending on the target application.