hollow glass

1.Optical performance:made of different raw glass sheet and thickness,the optical performance is different,Its range is :transmittance of solar spectum 20-50%.Transmittance of visible light 10-80%,reflection of heat radiation 25-80%. 2.Heat insulation:It is affected by the factors of raw glass sheet,thickness,air space thickness.The heat exchange ratio can reach 1.6W/M2K that is only 1/2 compared to narmal glass in case of low-E glass used as raw glass.For the heat insulation,It would become higher along with more thickness of air space within certain range. 3.Sound insulation:general can reach 29-32 dB 4.Resistance to frosting:in general case,frosting temperature on the surface of insulating glass inside room is about 15 centigrade lower than normal glass. 5.Dew point:It is below -40 centergrade. 6.Increasing area utilization for buildings:can reduce "unused area" near windows, so that can increase untilized area 2-4 square meters.