Photostabilizer-type HALS were analyzed by reverse- and normal-phase liquid chromatography (HPLC) using C-18, cyano, silica, and amino columns with different solvent mixtures as the mobile phase. The stabilizers analyzed were Tinuvin 770 and Chimassorb 944. The best separation was attained using a NH2-column and acetonitrile/water as the mobile phase. Also, three types of extraction procedures were performed to isolate these additives from the polymeric matrix. The most efficient extraction method was achieved by refluxing the sample with toluene. Recoveries of 95% were found for additives using this method.