Which type of glass can be heat-strengthened or tempered?

The correct choice is reflective glass with a pyrolytic deposition, as this type of glass can undergo heat-strengthening or tempering processes to enhance its strength and thermal resistance. Reflective glass is created by depositing a thin layer of metal or metallic oxide onto the glass surface, which not only provides a reflective quality but also allows it to be treated effectively.

Heat-strengthening involves heating the glass to a specific temperature and then allowing it to cool slowly, which increases its strength compared to standard glass. Tempering further enhances this by heating the glass to an even higher temperature and then rapidly cooling it, creating compressive stresses that improve overall structural integrity and thermal resistance.

Other types of glass listed, such as annealed glass, are not suitable for these processes, as they lack the strength and thermal properties needed. Insulated glass typically consists of two or more panes separated by an air space and is not inherently heat-strengthened. Wired glass incorporates metal wire within the glass for safety and fire resistance but is not conducive to heat treatment in the same way that reflective glass is.