... Flat,Website:http://www.hopson-glass.com, safe, tempered glass, insulated glass, curtain wall, clear glassBusiness type: factory, manufacturerFunction: commercial ... are not threatening to human.2.Stronger resistance to thermal breakage than annealed or heat strengthened glass 3.4 ... They are widely used for building curtain wall and windows as the functions of soundproof and energy conservation.1. ...