In this paper,the borosilicate glass /Al2O3tape was prepared with the binder system of polyvinyl butyral( PVB) by tape casting. The effect of PVB on the bulk density,the microstructure and mechanical property of green tape was detailly studied. The results showed that with the decreasing of molecular weight and hydroxyl content of PVB,the decomposition temperature,the tensile strength and breaking elongation of green tape were reduced; the bulk density was increased; the density and dielectric properties of...