NOVELTY - A sealant is obtained by mixing glass phase matrix and ceramic fiber-like particles in the volume ratio of 25:75-75:25. The ceramic fiber-like particles are dispersed uniformly such that they are oriented in the sealant. The glass phase matrix consists of component selected from barium oxide, alumina, silica, calcium oxide, titanium dioxide, zirconia, magnesium oxide, lanthanum trioxide and boron trioxide.    USE - For solid acid compound fuel cells.    ADVANTAGE - The glass/ceramic fiber sealant is excellent in air tightness and is manufactured easily and simply. The arrangement of the fiber particles in the glass phase matrix is controlled easily by the change in viscosity of the glass phase with change in temperature and pressure of fuel cell stack by changing the composition and density of the sealant. The damaging of other components of fuel cell by the glass dissolved is prevented using the glass/ceramic fiber sealant, and exchanging of the components is made easier. The dimensional change during stacking is minimized by optimizing two-dimensional orientation of ceramic fiber-like particle during hot press molding. The non-uniform filling of fiber particle is suppressed by suppressing the direct contact between the particles. The ceramic fiber-like particle acts as a support frame which forms network structure and provides structural stability to sealant. The molding of the sealant into gasket is made easier and can be positioned at the interlayer of unit fuel cell which maintains uniform airtightness irrespective of size and pressure change of the stack. Since the glass phase matrix is filled inside the support frame, fluidity of the glass phase by temperature raise is suppressed. Therefore the high temperature melting and damaging of other components of fuel cell is prevented. The sealant has improved thermo-mechanical stability.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for manufacture of sealant. Glass powder which consists of component selected from barium oxide, alumina, silica, calcium oxide, titanium dioxide, zirconia, magnesium oxide, lanthanum trioxide and boron trioxide is mixed with porous ceramic fiber-like particle and organic substance containing filler, hardener and plasticizer. The resulting mixture is mixed with non-aqueous solvent to form slurry which is dispersed and stirred in a non-solvent to produce granules. The granules are press molded at pressure of 10-1,500 kg/cm2 and temperature of 25-200degreesC in a required pattern to manufacture the sealant.    DESCRIPTION OF DRAWING(S) - The figure shows the manufacture of the glass/ceramic fiber sealant for solid acid compound fuel cells. (Drawing includes non-English language text).