Also hollow glass and steel, as member of the air replaced by heavy gas then double steel hollow glass, its insulation value is 1.4W / (m2.K). Thinning the thickness of the metal layer, the light transmittance can be increased to about 60% -60%. Infrared reflectivity of such an extremely thin coating has a very good protection too can the role, but also still very high value, 85% or 75% range. 12mm air layer is filled with heavy gas intermediate layers of insulating glass, with a coating insulation values ??of up to 1.6-1.9W / (m2.K). Sealant should meet the following requirements: elastic sealant for insulating glass shall comply with JC / T486; the insulating glass plastic sealant should comply with the relevant regulations; the first use of the second inter-component sealant color should be clear ; valid for more than six months; hidden box walls with a second sealant must be a silicone sealant; insulating glass must meet performance requirements. c strip: The plastic sealant containing desiccant and wavy strips made of aluminum, its performance should meet the appropriate standards. c interval box: When using a metal spacer frame, should decontamination or chemical treatment. d. quality desiccant, specifications, performance should be consistent with the corresponding standards.