Insulated Low-E Glass

Insulating glass, new building materials which has a good heat insulation, sound insulation, beautiful application, and reduces the weight of the building itself, high-performance sound and thermal insulation glass is made of use two (or three) glass, the use of high strength and high airtight compound binder, the glass and aluminum frame containing desiccant.

1, ordinary insulating glass
Insulating glass consists of two or more pieces of sheet glass. Surrounded by high strength and high airtight compound binder, two or more pieces of glass and seal, the glass of the bonding and sealing. Charge into dry gas in the gap between the glasses, the box filled with desiccant to ensure dryness of air between the glasses. According to the different performance requirements of raw materials, we can use a variety of glass, such as clear float glass, patterned glass, heat-absorbing glass, heat-reflective glass, wired glass, tempered glass and the frame (aluminum frame or glass ribbon, etc.), after cementation, welding or welding and steel.

Insulating glass can be 3,4,5,6 mm thick slices degree of the original glass, the air layer thickness can be 6,9,12 mm intervals.
(1) Technical requirements for insulating glass, GB11944-89 requirements summarized below.
①Raw material
a, Raw material glass can be used flat glass, laminated glass, figured glass, heat-absorbing glass, heat-reflective coated glass, tempered glass. Float glass shall comply with the provisions of a GB11614 products, grade A and superior product, laminated glass should be consistent with the provisions of GB9962; tempered glass should be consistent with the provisions of GB9963.
b. Sealant shall meet the following requirements
Color difference between the first, second sealant should be clear. Valid in more than six months;
The second sealant for hidden frame curtain wall should be silicone sealant, which must meet the performance requirements of insulating glass.

C, Interval frame, when using the aluminum interval frame, anodized decontamination must be carried.

d. quality of desiccant, specifications, performance must meet the insulating glass manufacturing and performance requirements

②,the tolerance of length and width for Insulating glass
Length, width, (mm), tolerance (mm)
Less than 1000mm ±2   between 1000-2000mm ±2.5mm    between2000-2500mm ±3mm
③The tolerance of thickness for Insulating glass
 Glass thickness, normal thickness (mm), tolerance (mm)
≤6<18±1    18-25±1.5     >6>25±2

Note: The nominal thickness of the insulating glass is two pieces of raw material glass thickness and the thickness of interval frame.

④The two diagonal tolerance for insulating glass
The length of two diagonal (mm), tolerance (mm)
<1000mm 4mm   ≥1000-2500mm 6mm
⑤Sealant width for Insulating glass: single-channel width should be calculated to determine the sealing layer, the minimum width is 10 ± 2mm, double sealed outer sealant should be calculated to determine the width, the minimum width of 5-7mm.
⑥Appearance: the inner surface of hollow glass shall not have spatter stains and adhesives which impede the perspective.
⑦Performance requirements, according to GB7020, insulating glass sealing, dew point, ultraviolet radiation, climate cycles and high temperature, high humidity must meet the following requirements
Performance requirements for testing conditions of the pilot project
Sealing, sealed in test pressure lower than ambient pressure 10 ± 0.5KPa, the thickness of growth must be ≥ 0.8mm, maintain the pressure for 2.5, the thickness of the growth deviation <15% of all samples does not allow leakage.
Dew point, alternate the machine for dew point down to ≤ -40 °, the dew point and sample surface, the inner surface of all samples exposed 3min no condensation or frost.
Ultraviolet radiation, ultraviolet radiation for 168h, the sample inner surface may not have fog and traces of pollution.
Hot and humid climate circulation, climate test, after 320 cycles of hot and humid climate circulation, climate test, after 224 cycles of high temperature test, then do the dew point test. Total 12 samples, at least 11 should be with no condensation or frost.
For hidden frame wall insulating glass, the second insulating glass sealant must be silicone sealant, and with structural glazing sealant, they must be mutually compatible sealant. When using a silicone sealant for the structural component, the best order of the insulating glass seal layer is also the same silicone with one sealant plant.

(2) Performance of insulating glass
Thermal conductivity of glass is 27 times more than air as long as the insulating glass is sealed, the insulating glass insulation is the best
(3) The characteristics of insulating glass
The two pieces of insulating glass are leaving some cavities. Therefore, with good insulation, heat insulation, sound insulation properties. If the glass were filled with a variety of dielectric materials or diffuse light, etc., they will receive a better voice, light control, insulation and other effects
(4) The use of insulating glass
Insulating glass is mainly used for needs of heating, air conditioning, condensation, and the need to prevent noise or no direct sunlight, and special light buildings. Widely used in homes, restaurants, hotels, office buildings, schools, hospitals, shops and other indoor with needs of the air-conditioning. Also be used for trains, cars, boats, freezer doors and windows, etc

2, high-performance insulating glass
High-performance insulating glass and normal insulating glass are different, except in the middle of two layers of glass sealed dry air outside, more over in the middle of the outer air layer side of the glass, coated with a layer of thermal performance to a special metal film. Decrease the sun shines on it from the interior of considerable energy, play a greater thermal insulation.
(1)    characteristics of high-performance insulating glass
Gold, copper and silver metal coating in the far infrared region, which is greater than 4μm wavelength range, the reflection rate is high. Such as the typical thickness of the metal coating, all reflection rate of 90% -95%, equivalent to the high infrared reflectivity of low-emissivity (Low-e), which will reduce the insulating glass components of glass inside and outside the radiation conversion, and Corresponding to this is that the air layer is 12mm with standard insulating glass components compared to its thermal insulation value from 0.3W / (m2.K). In addition, components such as heavy gas in the air replaced by the words, its insulation value is 1.4W / (m2.K). Thinning the thickness of the metal layer, the transmittance can be increased to about 60% -60%. Such a thin coating has a very good protection too will the role, but also still very high infrared reflectivity value of 85% or 75% range. The middle layer of 12mm air filled with heavy gases, with the coated insulation value of up to 1.6-1.9W / (m2.K)

①Better energy savings
High-performance insulating glass, as a layer of special metal film can be achieved by shielding factor of 0.22-0.49, so that the indoor air (air) to reduce the load. Heat transfer coefficient is 1.4-2.8W (m2.K), better than ordinary insulating glass. Reduce the load on the indoor heating, also play a significant efficiency. Therefore, the larger the windows open, the more obvious energy saving effect.

②Improve the indoor environment
High-performance insulating glass can cut-off considerable energy by the sun hitting and the, which can prevent radiation-induced discomfort and reduce sun-induced dazzling sunset
③Rich colors and artistic
There are a variety of colors for high performance insulating glass, in order to achieve better artistic effect. The color can be selected according to need,
④Usage of high-performance insulating glass
For office buildings, exhibition halls, libraries and other public facilities and as computer rooms, precision instrument workshop, chemical plants and other requirements lasting temperature and wet buildings. There is also can be used for sun protection and anti-dazzling sunset place.

Note: dry air was charged in insulating glass, therefore, according to temperature, air pressure changes, the internal air pressure change, but produced only a small glass surface deformation. In addition, manufacturers may produce small warping; the construction process may also form distortion. Therefore，including such factors, reflecting changes accordingly. Using different colors, reflecting was not the same.

(2)Performance of high performance insulating glass
Gold, copper and silver metal coating in the far infrared region, which is greater than 4μm wavelength range, the reflection rate is high. Such as the typical thickness of the metal coating, all reflection rate of 90% -95%, equivalent to the high infrared reflectivity of low-emissivity (Low-e), which will reduce the radiation conversion, components of glass inside and outside between the insulating glass, and Corresponding to this, the air layer is 12mm with standard insulating glass components ,thermal insulation value is 0.3W / (m2.K). In addition, filling gas was replaced by heavy gas, its insulation value is 1.4W / (m2.K). Thinning the thickness of the metal layer, the transmittance can be increased to about 60%. Such a thin coating has a very good protection of sun energy, but also still very high infrared reflectivity value of 85% or 75% range. The middle layer of 12mm air filled with heavy gases, with the coated layer the insulation value of up to 1.6-1.9W / (m2.K)