Laminated glass in general is composed of two pieces of glass and Polyvinyl Butyral in between, or three pieces of glass and two layers of Polyvinyl Butyral in between, more layers is also possible. The substrate of laminated glass can be common plating glass, or tempered glass, heat tempered glass, film coating glass, endothermic glass, heat curved glass, etc. The intermediate organic material is PVB in common.