Crystallizing glass solder, useful e.g. to produce high temperature joints for fuel cells, compris

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The present invention relates to be crystallized and composites glass plumb bobs, which in particular are suitable for high temperature applications, and their applications, for example, in fuel cells. 25% to 40% in wt- % SiO includes glass solder be crystallized The, 45% to 60% BaO, 5% to 15% BO, < 2% 0a [...] at least one alkaline earth oxide from the group consisting of MgO, CaO and SrO by a coefficient of thermal expansion in the temperature range of 20 °C and 300 °C 10Kaus 10Kbis 12.0 8.0 · by · to.