TECH KLEEN STNPB Stabilized is a general cleaning solvent based off of N propyl bromide and specially formulated to remove contaminants such as oils, greases, adhesives, resins, and flux residues. Tech Kleen STNPB Stabilized n Propyl Bromide is a direct replacement for 1,1,1-trichloroethane, trichloroethylene, HCFC-141b, HCFC-225, hydrofluorocarbons, methylene chloride and perchloroethylene.