Octadecylamine , also known as stearic amine or 1-aminooctadecane, is an aliphatic amine compound widely produced in industry. It is a white crystalline substance at room temperature, with a molecular weight of 269.52. Melting point 52.8612. Boiling point 23212 (4.27 kPa). Flash point 149 ℃. Relative density 0.8618. The refractive index is 1.4522. Microchemicalbook is soluble in acetone, kerosene, and methanol, easily soluble in carbon tetrachloride, chloroform, ethanol, isopropanol, and toluene, soluble in alcohol, ether, benzene, and insoluble in water. Alkaline. Can form adducts with hydrochloric acid. The toxicity is lower than that of low-grade amines. Rats were orally administered 500 × 10-6 stearamine for two consecutive years without showing significant adverse consequences. Irritating to human skin and mucous membranes.