Gold, copper and silver metal coating far infrared region, the wavelength range is greater than 4μm, the high reflectivity. The metal coating is a typical thickness of all the reflectance of 90% -95% of hollow glass offer high infrared reflectivity is equivalent to a low emissivity (Low-e), which will reduce the insulating glass assembly inside and outside of the glass radiation conversion 12 insulating glass, and the corresponding insulating glass is low compared with the air layer is 12mm standard insulating glass member, its insulation value can be from 0.3W / (m2.K). a. Glass can be float glass, laminated glass, patterned glass, heat-absorbing glass, coated glass, tempered glass, curtain wall of steel and semi-tempered glass, colored glass. Float glass should comply with the provisions of GB11614 insulating glass, laminated glass should comply with GB9962, the glass should comply with GB9963, and walls of steel and half glass of compliance with GB17841. Other varieties of glass should conform to appropriate standards or agreed upon by both parties.