Zinc Stearate CAS: 557-05-1. Zn(C18H35O2)2 Percentage of zinc may vary according to intended use, some products being more basic than others. Properties: (pure substance) White, hydrophobic powder free from grittiness; faint odor; d 1.095; mp 130C; soluble in acids; soluble in common solvents when hot; insoluble in water, alcohol, and ether. Combustible. Derivation: Action of sodium stearate on solution of zinc sulfate. Grade: USP, technical, available free from chick edema factor. Use: Cosmetics, lacquers, ointments; dusting powder, lubricant, mold-release agent, filler, anti- foamer, heat and light stabilizer, medicine (dermatitis), tablet manufacture, dietary supplement