Thermally　induced　crystallization　in　sealing　glass　is　one　of　the　main　factors　in　affecting　their　application　in　intermediate-temperature　solid　oxide　fuel　cells　(IT-SOFCs).　Herein,　the　influence　of　crystallization　on　the　physical　properties　and　sealing　ability　of　BaO-MgO-Al2O3-B2O3-SiO2　(BMABS)　glass　are　investigated.　The　results　show　that　crystal　phases,　BaAl2Si2O8,　BaMg2Si2O7,　and　Ba5Si8O21　are　readily　precipitated　from　the　glass　at　a　pre-annealing　temperature　of　750　°C,　and　the　crystallinity　reaches　44　%　and　58　%　after　pre-annealing　for　20　h　and　100　h,　respectively.　Nevertheless,　the　physical　properties　of　the　pre-annealed　BMABS　glass　fall　into　the　requirements　for　IT-SOFCs.　After　pre-annealing　at　750　°C　for　100　h,　the　coefficient　of　thermal　expansion　of　BMABS　is　10.7　×　10−6　K−1,　the　electrical　conductivity　is　3.2　×　10−7　S　cm−1　at　750　°C,　and　the　self-healing　ability　is　maintained.　Moreover,　the　utilization　of　a　stainless　steel　|　BMABS　glass　|　single　cell　sandwiched　assembly　assessment　demonstrates　excellent　gas-tightness　and　intact　sealing　interfaces　between　the　BMABS　glass　and　adjacent　components.　©　2025　Elsevier　Ltd　and　Techna　Group　S.r.l.