Insulated Glass is made up of two pieces of glass by high-strength airtight complex gluing. In between is aluminum alloy frame with drier, and air between the sheets is tight. Energy-conservation: K value of heat conduction System, K value of single slice with thickness of 6mm glass is 5.75kcal/mh, K value of hollow glass is 1.4 --2.9kcal/mh, K value of hollow glass with Fluorine sulphur can drop to 1.19kcal/mh. Argon is used to reduce K value while argon sulphur gas is used to lower dB value of noise. Those two kinds of gas can be used alone, or mixed in certain proportion. Sound insulation: Hollow glass filled with inert gas reduces 30 db of noise, and hollow glass can drop from 80db to 45db. Condensation of moisture-prevention: Under environment of large difference in temperature in winter, hollow glass is dew-free. Usage: Office building, hotel, hospital and library; Exchange room, broadcasting room, recording canopy, computer laboratory, automobile, train car window and airport control tower; Places where heat preservation is needed.