Hermetic sealing composition

摘要

A hermetic sealing composition consisting essentially of from 90 to 99.95 wt % of a crystalline low melting glass powder and from 0.05 to 10 wt % of a low expansion ceramic filler powder, and having an average thermal expansion coefficient after firing of from 80x10-7 to 110x10-7/ DEG C. within a range of from room temperature to 300 DEG C., wherein the crystalline low melting glass consists essentially of: - PbO 71.5 to 78.0 wt % - ZnO 10.5 to 14.5 wt % - B2O3 7.0 to 10.0 wt % - SiO2 1.65 to 3.0 wt % - BaO 0.1 to 1.95 wt % - SrO 0 to 1.5 wt % - CaO 0 to 1.5 wt % - BaO + SrO + CaO 0.5 to 1.95 wt %, - and contains substantially no fluorine, and the weight ratio of ZnO/PbO is within a range of from 0.14 to 0.20.