B 2420 (OTTO) Butyl stearate Cas 123-95-5 - used as finishing agents, lubricants and lubricant additives. B 2420 (OTTO) Butyl stearate Cas 123-95-5 - used as a plasticizer, food packaging material and as a dye solvent. It acts as a reactant and involved in the preparation of octadecanoic acid methyl ester by reacting with methanol.