Glasses in the SnO-ZnO-P2O5（SZP）ternary system were studied on potential replacements to PbO-ZnO-B2O3 or PbO-ZnO-SiO2 frits for low temperature (＜500℃) sealing applications to eliminate the harm of Pb to human body and environment. An area of glass formation was found in the SZP ternary system. The relationship of SnO-ZnO-P2O5 glasses between composition and transition temperature have been studied. In order to improve chemical durability and thermal stability the SiO2 was added to these SZP glasses. The coefficient of thermal expansion (CTE) and transition temperature (Tg) of these glasses were tested. Effects of glass composition on coefficient of thermal expansion (CTE) have also been determined. （From : No.2, 2006 Glass & Enamel )