The article discusses the specifications for heat-treated flat glass used in building construction. It covers different types of glass conditions and kinds, such as heat-strengthened and fully tempered glass. The glass must undergo specific fabrication processes before strengthening or tempering. The support system and glass deflection under wind-load conditions need to be considered during design. Heat-treated glass cannot be cut after tempering but can have holes, notches, and bevels. The expansion fit and porosity of ceramic coatings must meet certain requirements. Testing for resistance to alkali and acid is also necessary.