... Min.Dimension:180mm*320mm +Thickness of the Hollow Glass:12mm-50mm +SGS +hollow glass Hollow Glass is made by two or more pieced ... gas,then use compacting material to pressurize its round. Hollow Glass has good function of heat insulation ,sound insulation ,frostproof ... further with the inert gas in the space.Products ApplicationHollow Glass is applied extensively to the office building, hotel, hospital ...