Ferric stearate is a metallic soap, specifically an iron(III) salt of stearic acid. It typically appears as a yellowish-brown to brown powder or solid. Its chemical structure consists of a central iron(III) cation coordinated to three stearate anions, which are long-chain fatty acid residues. The primary industrial application of ferric stearate is as a functional additive in polymer and plastic processing. It acts as a lubricant and release agent, facilitating the molding and extrusion of plastics like polyolefins. It also serves as a stabilizer, particularly as a heat stabilizer in polyvinyl chloride (PVC) formulations, and can function as a catalyst or catalyst component in certain chemical reactions. Additionally, it finds use as a drier in paints, varnishes, and inks, accelerating the oxidation and polymerization of drying oils. Ferric stearate is insoluble in water but soluble in organic solvents like ethanol and ether. As with many metal carboxylates, it should be handled with care, avoiding inhalation of dust and contact with eyes and skin. Its stability and performance are influenced by factors such as purity and particle size.