
A solid oxide fuel cell device incorporates a sealing material resistant to hydrogen gas permeation at a sealing temperature in the intermediate temperature range of 600.degree. C. 800.degree. C., the seal having a CTE in the 100.times.10.sup.-7/.degree. C. to 120.times.10.sup.-7/.degree. C., wherein the sealing material comprises in weight %, of: (i) a 80 to 95 wt % of glass frit, the glass frit itself having a composition in mole percent of: SiO.sub.2 70 85%; Al.sub.2O.sub.3 0 5%; Na.sub.2O.su...











