The　detection　of　the　identities　and　concentrations　of　sulfur　hexafluoride,　SF6,　decomposition　products　is　important　for　evaluating　the　conditions　of　SF6-gas-insulated　equipment.　This　study　is　a　preliminary　test　of　the　use　of　cassiterite　(110)　for　detecting　SF6　and　SF6　decomposition　gases,　including　HF,　H2S,　SO2,　SOF2,　SO2F2,　CF4,　CO,　and　CO2.　First-principles　calculations　were　adopted　to　investigate　the　adsorption　mechanism　of　SF6　decomposition　gases　on　a　cassiterite　(110)　surface,　using　adsorption　energy,　geometrical　structure,　frontier　molecular　orbitals,　electron　density,　density　of　states,　potential　energy,　and　work　functions.　We　found　that　the　adsorption　of　H2S　made　a　noticeable　change　in　the　electronic　properties　of　the　(110)　surface.　The　adsorption　of　SO2　strongly　influenced　the　charge　distribution　of　the　cassiterite　(110)　surface　and　made　the　greatest　decrease　in　the　work　function　of　the　nine　gas　molecules　tested.　Conversely,　changes　in　the　cassiterite＇s　electronic　properties　induced　by　other　gases,　especially　SF6,　were　slight.　Therefore,　cassiterite　could　be　a　promising　candidate　for　highly　selective　and　sensitive　sensors　to　detect　H2S　and　SO2　in　SF6　decomposition　gases.　(C)　2018　Elsevier　B.V.　All　rights　reserved.