[China Glass Network] L ow-E glass is increasingly favored by the construction market for its superior energy-saving performance. Due to the increase in sales and the maturity of manufacturing levels, the price of low-e glass has also decreased, and the range of applications has expanded rapidly from the beginning of high-end public buildings to ordinary civil buildings.
So how do you identify ordinary glass and low-e glass?
In practical applications, if the Low-E glass is known, the position of the Low-E film surface is relatively simple. However, due to the particularity of the Low-E glass, it is difficult for the general personnel to distinguish it from the ordinary coated glass or even the non-coated film. The difference in glass.
1. Photometer measurement The more accurate method for identifying Low-E glass is to measure the radiance of the glass surface using a far-infrared spectrophotometer. According to GB/T18915.2-2002 "Low-evaporation coated glass" standard, offline Low-E glass irradiance ≤ 0.15, online Low-E glass radiance ≤ 0.25. This is also the method used by authoritative glass testing institutions.
However, since only a small piece of monolithic glass can be detected, the insulating glass must be disassembled into a single piece of glass before it can be carried out. At the same time, because the far-infrared spectrophotometer is expensive, this method is not suitable for rapid determination of processing and use.
2. In the determination method applicable to the site, the single-piece Low-E glass is better discriminated. At present, the application of single-piece Low-E in the domestic market is mainly Yaohua Online Low-E glass, which can be used for tempering, hot bending and interlayer processing like ordinary glass. This glass can be measured and measured by a portable surface radiance meter to measure the radiance of the glass surface, but a simpler and more practical method is surface resistance measurement.
3. Conductive measurement method Since the heat reflection effect of Low-E glass is actually the result of the action of free electrons and electromagnetic waves of the film layer, the surface of the Low-E glass is electrically conductive.
The surface resistance of ordinary uncoated glass is infinite, and the surface control resistance of the solar-controlled coated glass will decrease depending on the material of the coating. However, it is still high. The sheet resistance of the Low-E glass surface is generally below 20 ohms.
With this feature we can quickly identify. The sheet resistance of the glass surface should be measured by a four-probe tester. The sheet resistance can be measured by placing the measuring head on a dry and clean glass surface. The sheet resistance can be converted into an emissivity by a correlation formula to determine whether it is Low- E glass.
Using a common multimeter can also be easily determined. The pen tip of the multimeter is placed on the surface of the glass, and the pitch of the positive and negative pen tips is about 1 cm. If the resistance value displayed is several tens of ohms, it can be judged that it is a Low-E glass film surface. If it is 100 ohm or more, it is not a Low-E glass film surface. However, this method is susceptible to pen tip spacing, contact pressure and contact area, so multiple measurements should be made.
4. Since the Low-E film surface is placed inside the insulating glass when the insulating glass is synthesized, it is difficult to determine whether the hollow glass uses Low-E.
Although the heat transfer coefficient of Low-E insulating glass is much lower than that of ordinary insulating glass, it is not easy to quickly measure the heat transfer coefficient of glass in the field. At present, the relatively simple method is to use the conductivity principle of Low-E glass without destroying the insulating glass.
A weak electromagnetic field is created by using a solenoid or a capacitor. When the Low-E glass coated with a conductive film is close to the electromagnetic field, the state of the electromagnetic field is changed, thereby affecting the output current or the output voltage.
According to this principle, it is possible to detect whether there is a Low-E film inside the hollow glass, and it is possible to know whether the distance of the Low-E film is far or near depending on the magnitude of the change. At present, the relatively mature Low-E film surface tester on the market is based on this principle. The hand-held Low-E tester is placed close to the surface of the insulating glass, and the test button is pressed, and the indicator light can be flashed. Determine whether there is a low-E film surface.
This method is quick and simple, and does not need to disassemble the insulating glass, so it has good promotion value. However, if the area of ​​the insulating glass is too small, the test results are easily affected by the aluminum strips or window frames on the sides, and the test results are not authoritative. That is to say, when the instrument determines that there is a Low-E film, it cannot be guaranteed to meet the standard. Low-E products.
5, image measurement method is currently circulating such a method of identification: put a match or bright objects in front of the window glass, observe the four images presented in the glass (in other words, there are 4 flames or 4 objects), if Low-E glass has one image that is different in color from the other three images. If the four images are the same color, you can be sure that Low-E glass is not installed.
This method is based on the principle that even a colorless, high-permeability Low-E glass will have a slight reflection color, which is only suitable for simple between white glass hollow glass and colorless Low-E insulating glass. Discrimination.
6. Hollow Low-E glass has some other simple identification methods. Although they have limitations, they are helpful for comprehensive use. When the offline Low-E is hollow, it is necessary to remove the edge film layer, so it can be determined by checking whether the edge of the glass is close to the spacer and whether there is a boundary line between the glass and the film.
When the line Low-E is hollow, the edge film layer is not removed, so that it can be determined by an electric resistance method where the edge sealant does not cover the inner surface of the glass.
In summary, the identification method of single-piece Low-E glass is relatively simple, and the hollow Low-E is difficult to accurately determine without disassembling. At present, many researchers are studying more practical detection instruments.
In practical engineering applications, we can use a variety of methods to comprehensively determine, but a more accurate approach, it is recommended to randomly sample samples from the actual product to the authoritative testing department test method, can identify whether it is Low-E Glass can test its performance.
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