Dodecylpyridinium chloride is a cationic surfactant. Micellization characteristics of dodecylpyridinium chloride have been studied. Properties such as molar conductivity, surface tension and surface adsorption parameters has been reported. A non-ionic-cationic mixed system composed of Triton X-100? and dodecylpyridinium chloride respectively was studied for its clouding behavior[1-2].