A series of glass sealants for solid oxide fuel cell (SOFC) with compositions SrO (x wt %) La<sub>2</sub>O<sub>3</sub> (15 wt %) Al<sub>2</sub>O<sub>3</sub> (15 wt %) B<sub>2</sub>O<sub>3</sub> (40-x wt %) SiO<sub>2</sub> (30 wt %) [x = 10, 15, 20, 25 & 30] [SLABS] have been investigated by quantitative Fourier Transform Infrared Spectroscopy (FTIR). Structural findings from FTIR reveal that with increasing substitu-tion of B<sub>2</sub>O<sub>3</sub> by SrO, even though the B<sub>2</sub>O<sub>3</sub>/SiO<sub>2</sub> ratio decreases, however the Si-O- non-bridging bond content in the matrix is increasing and glass structure is getting more inverted. UV-Vis Diffused Reflectance Spectroscopy (UV-Vis-DRS) of the glass series shows that electrical band gap of glasses decreases in the series from 3.07eV to 2.97eV with increasing substitution from x = 10 to x = 30. Conductivities of the glass samples were measured by AC impedance spectroscopy and found to be increasing from 2.74 × 10<sup>-5</sup> Scm<sup>-1</sup> to 1.09 × 10<sup>-4</sup> Scm<sup>-1</sup> with increasing substitution from x =10 to x = 30.
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