completely resolve dimethyl phthalate and dimethyl sebacate, eluted in that order, and could be used for the analysis of compositions containing both these esters, should the need arise.Antarox CO-990 has now replaced polypropylene sebacate because of its lower bleed rate at an operating temperature 40 °C below its maximum of 225 °C, and because of improved separation of triacetin and diacetin. Dimethyl sebacate and dimethyl phthalate, eluted in this order, are not completely resolved by this liquid phase. The results obtained were all within the precision usually expected for gas chromatographic analysis-i.e., ±1% relative.