This kind of buiding glass is fire rated, with the followed specification:

With fire-resistant integrity, is a Class E fire glass, with high-strength glass,the integrity of good fire, somke, weatherability good and so on. Mainly used in the walls of buildings, expecially on the external walls of direct sunlight, can prevent the fire from outside the spread of indoor and outdoor to indoor spread of the fire.Thickness : 6mm, 8mm, 10mm, 12mm. Fire time : 30minutes, 60minutes, 90minutes, 120minutes.