The influence of co-additions of crystalline TiO2 and SiO2 fillers (10 wt% addition in total) to BaO-ZnO-B2O3-SiO2 glass on resultant properties was investigated from the viewpoint of applying the material to the barrier ribs of plasma display panels. The substitution of SiO2 for TiO2 reduced the dielectric constant significantly, while it maintained high optical reflectance and appropriate coefficient of thermal expansion (CTE) in the case when TiO2 alone was used. A 5-7.5 wt% SiO2 addition with 2.5-5 wt% TiO2 under the constraint of 10 wt% total fillers demonstrated an optical reflectance of about 55%, a CTE of about 8.3 x 10(-6) K-1 (compatible with glass panels), and a dielectric constant of about 7.5, which are promising properties for the barrier rib application.