In addition, as part of the air from the heavy gas alternative words hollow glass samples, the insulation value is 1.4W / (m2.K). Thinning the thickness of the metal layer of insulating glass, the light transmittance can be increased to about 60% -60%. Such a very thin coating has a very good protection too can the role, but also still very high infrared reflectivity values ??double steel hollow glass, in 85% or 75% range. An intermediate layer of 12mm air filled with heavy gas, with a coating insulation values ??of up to 1.6-1.9W / (m2.K). Hollow glass is mainly used for the outer glass. Its optical properties, thermal conductivity, noise factor shall comply with national standards. Reasonable structure, two hollow glass, hollow glass designed to meet the standards, in order to play its insulation, noise, theft, fire effect. Using vacuum double glass can also reach the laboratory standards! Also adding color pigments gas inert gas and hollow glass, as well as increase the beauty and decorative strips reinforcing the role played in the market.