Aq. soln. of cetylpyridinium chloride (6 g/L) was dild. with BuOCH2CH2OH, EtOCH2CH2OEt or (BuOCH2CH)(2)O, stabilized by addn. of C11H23OH, C12H25OH, C16H33OH or a corn. mixt. of C12H25OH and C14H29OH and studied for foaming ability and foam stability at room temp. The highest expansion ratio (11.1) and foam half-life time (20.2 mm) was achieved when C11H23OH was used as solvent and EtOCH2CH2OEt used as stabilizer.