On One Hand: Super Glue is FlammableSuper glue--the common name for cyanoacrylate adhesives--is highly combustible. When heated, super glue becomes unstable and gives off hazardous fumes, according to the Occupational Safety and Health Administration, which produces a Material Data Safety Sheet on these kinds of adhesives.On the Other: There are Microwave Safe AdhesivesSeveral adhesive manufacturers produce non-toxic, microwave-safe glues. These adhesives are appropriate for repairing most cookware material, including ceramics, glass and plastics. Microwave-safe glue may be used to make cosmetic repairs to external, non-mechanical components of the microwave and as a temporary fix to the appliance's rotating glass tray before it is replaced.Bottom LineNeither super glue or microwave-safe glues should be used for interior repairs to a microwave. The Material Safety Data Sheet for cyanoacrylate adhesives specifically warns against exposing super glues to heat.