In this study, glass-cerarnic composites as sealing materials for solid oxide fuel cells (SOFCs) were investigated. A cornmercially available magnesium boro-silicate glass with soften temperature of about 700 degrees C, and MgO powder were used for the composites in order to control and improve the thermal property as the sealing materials for low temperature SOFC. MgO was added 0-30vol% into the glass matrix to prepare the glass-ceramic composites and the properties of each composite was investigated. An increase of the coefficient of thermal expansion (CTE) for the glass-ceramic composites and an improvement of thermal stability were observed as the amount of the MgO additive increased, while the electrical and sealing performances were degraded. As a result, the composite with 10 vol% MgO additive was shown to have high thermal stability with reasonable sealing performance. (C) 2008 Elsevier B.V. All rights reserved.