To understand seal glass compatibility with interconnect materials in solid oxide fuel/electrolyzer cell environments, a SrO-La2O 3-Al2O3-SiO2 (SABS-0) seal glass is bonded with bare AISI 441 alloy and (Mn,Co)3O4 coated AISI 441 alloy; the bonded samples are thermally treated in air and H 2/H2O atmospheres at 800 °C for 1000 h. Alloy oxidation, diffusion of the AISI 441/SABS-0 sample elements, chemical reaction, (Mn,Co)3O4 coating stability, and SABS-0 glass devitrification contribute to the interfacial interaction. The interfacial compatibility with the bare AISI 441 alloy is better than with the (Mn,Co) 3O4 coated AISI 441 alloy. The thermal treatment atmospheres have no significant effect on the interfacial stability for the bare AISI 441alloy. For the (Mn,Co)3O4 coated AISI 441 alloy, the interfacial stability is better in the H2/H2O atmosphere. © 2010 Professor T. Nejat Veziroglu. Published by Elsevier Ltd. All rights reserved.