“Insulating glass”

Insulating glass

Insulating glass was invented by Americans in 1865 and is a glass with good sound insulation and heat insulation. It is a high-performance sound-insulating glass made of two pieces (or three pieces) of glass, which is bonded with an aluminum alloy frame containing a desiccant by using a high-strength and high-air-tight composite adhesive.

Insulating glass structure

The insulating glass is composed of two or more layers of flat glass. The high-strength and high-air-tight composite adhesive is used to bond and seal two or more pieces of glass with the sealing strip and the glass strip. The middle is filled with dry gas, and the frame is filled with a desiccant to ensure the dryness of the air between the glass. Various original glass sheets with different properties can be selected according to requirements, such as colorless transparent float glass, embossed glass, heat absorbing glass, heat reflecting glass, wired glass, tempered glass, and the like. The insulating glass can be made of 3, 4, 5, 6, 8, 10, 12 mm thick original glass, and the thickness of the air layer can be 6, 9, 12, 15, 19, 24, 27 mm. Since there is a desiccant inside the hollow glass that can adsorb water molecules, the gas is dry, and when the temperature is lowered, the inside of the insulating glass does not cause condensation, and at the same time, the dew point on the outer surface of the insulating glass rises. high. For example, when the outdoor wind speed is 5m/s, the indoor temperature is 20°C, and the relative humidity is 60%, the 5mm glass starts to dew at the outdoor temperature of 8°C, while the 16mm (5+6+5) insulating glass is under the same conditions. Condensation occurs only when the outdoor temperature is -2 °C, and 27 mm (5+6+5+6+5) three-layer insulating glass begins to dew at an outdoor temperature of -11 °C.

Characteristics of insulating glass

1 Large energy-saving effect: High-performance insulating glass, due to a special metal film, can achieve 0.22-0.49 shielding coefficient, which reduces indoor air conditioning (air-conditioning) load. The heat transfer coefficient is 1.4-2.8W (m2.K), which is better than ordinary insulating glass. It also plays a great role in reducing the indoor heating load. Therefore, the larger the window is opened, the more obvious the energy saving effect is.

　　② Improve the indoor environment: High-performance insulating glass can intercept the considerable energy emitted by the sun into the room, thus preventing the discomfort caused by radiant heat and reducing the dizziness caused by the evening sun.

　　③ Better sound insulation

　　④ Strong safety Because the insulating performance of the insulating glass is better, the temperature difference between the two sides of the glass is larger, and the effect of cold radiation can also be reduced; when the outdoor temperature is -10 ° C, the temperature in front of the indoor single-glazed window is -2 ° C and the temperature in front of the hollow glass window is 13 ° C; in the same house structure, when the outdoor temperature is -8 ° C, the indoor temperature is 20 ° C, 3 mm ordinary single-layer glass cold radiation area accounts for 67.4% of the indoor space The double-layer insulating glass (3+6+3) was 13.4%. The use of insulating glass can improve the safety performance of the glass. In the case of using the original sheet glass of the same thickness, the wind-resistant strength of the insulating glass is 1.5 times that of the ordinary single-piece glass. The use of insulating glass can improve the safety performance of the glass. In the case of using the original sheet glass of the same thickness, the wind-resistant strength of the insulating glass is 1.5 times that of the ordinary single-piece glass. 5 Rich color and artistry: High-performance insulating glass has a variety of colors, and you can choose colors according to your needs to achieve better artistic effects.

　　Type of insulating glass

　　① Flat insulating glass: two pieces of glass constituting insulating glass are made of flat non-tempered or tempered float glass

　　②Three or more layers of hollow: that is, the glass composed of hollow is not two layers, generally three layers, and theoretically four layers and five layers.

　　③ Bent insulating glass: that is, two pieces of glass constituting the insulating glass are float glass of a hot bending or bending process.

　　④Coated insulating glass: One of the glass constituting the insulating glass is coated glass.

　　⑤ LOW-E Insulating glass: One of the glass constituting the insulating glass is made of low-emission Low-e glass.

Hollow argon gas

Argon (Ar) is a colorless, odorless, non-toxic inert gas. Its molecular weight is 38% heavier than air, its thermal conductivity is smaller than that of air, and its insulating glass is filled with argon gas (the amount of aeration is generally not less than 90%). As follows: 1. Increased heat insulation (energy saving): The density of argon is larger than that of ordinary air, and the heat transfer is worse than air. Therefore, charging into the insulating glass can slow the heat convection in the insulating glass and reduce the thermal conductivity of the gas. , reducing the U value (heat transfer coefficient) of the insulating glass, thereby increasing the heat insulation of the insulating glass. 2, enhanced sound insulation (noise reduction): inert gas transmission coefficient is small, generally can be reduced by about 5dB. For example: 6mm monolithic glass can reduce noise by 20~22dB; general hollow glass is 29~31dB; inflatable hollow glass can be reduced to 36dB. 3. Protective coating layer: Since argon gas is an inert gas and chemically inactive, it also has the function of protecting LOW-E film layer for LOW-E insulating glass, and can also make hollow aluminum spacers not oxidize so quickly. It is beneficial to improve the service life of the insulating glass.

How to distinguish the LOW-E surface of the insulating glass

For LOW-E insulating glass, it is impossible to determine whether or not the LOW-E film is plated by the naked eye. It can be judged by the following methods: 1. Contact measurement resistance method: measuring the conduction of the glass surface using a multimeter's resistance or resistance meter. The resistance value can be an ordinary multimeter. The surface of the pen tip glass surface is about 1cm apart. If the glass resistance is less than 20 ohms, the coating layer is LOW-E film. If it is larger than 20 ohms, the film layer It is a solar control film (non-LOW-E film); if the resistance value is infinite, the glass is a non-coated surface. The lower the resistance, the better the LOW-E is for infrared reflection. (The LOW-E pen adopts this principle.) This method is likely to cause damage to the low-e surface due to the force contact with the surface, thereby damaging the LOW-E function of the glass. (This method is not necessarily effective for LOW-E glass where the protective layer is not easily scratched because the tip of the multimeter is difficult to penetrate deeply into the silver Ag layer in the film.) 2. Image recognition method: Matches or bright objects Place it in front of the insulating glass and observe the four images in the glass (in other words, there are 4 flames or 4 objects). If it is coated glass, there is one image different from the other 3 images, if 4 images The same color, you can be sure that it is not coated glass. This method is based on the principle of color difference between transparent white glass and coated glass. For coated glass with low reflectivity, in order to avoid the influence of external light source, it is suitable to distinguish in dark environment. However, for coated glass with low reflectance and colorlessness, this method is not easy to discriminate. Also, in this way, it is impossible to determine whether it is a solar film (also called a heat reflecting film) or a LOW-E film. 3, thermal induction method: a piece of uncoated white glass (insulating glass) and a piece of LOW-E (hollow) glass to be tested simultaneously placed on the electric furnace or electric heater (for contrast, the distance between two pieces of glass from the heat source Should be the same) baking comparison verification, after a period of baking, touch the two glasses by hand, the thermal feel of LOW-E glass is significantly lower than white glass. The better the performance, the worse the heat absorption and heat transfer capability of the LOW-E glass, the less obvious the thermal sensation. This method is the simplest and most accurate method, and can compare the difference in performance of different LOW-E glasses. For coated glass, which is also a solar film (also called heat reflective film), this method can also be used for identification. The comparison of the thermal conductivity of white glass, sunlight coated glass and LOW-E coated glass is: white glass > sunlight coated glass > LOW-E coated glass. The LOW-E film is divided into single silver LOW-E, double silver LOW-E and three silver LOW-E. The comparison of heat conduction performance is generally: single silver LOW-E> double silver LOW-E> three silver LOW-E. In other words, the energy saving effect of the three silver LOW-E is generally the best.