The Role of Capillary and Breathing Tube in Hollow Glass
[Medium Glass Net] The "breathing tube" with large inner aperture needs to be sealed during later installation to prevent premature failure of hollow glass sealing. The disadvantage of this approach is that the overall performance of the sealing structure of the hollow glass window depends on the local door and window installation personnel, rather than in the hands of the production personnel of the hollow glass window. Therefore, no matter how good the production quality of insulating glass is, as long as there is no sealing of the breathing tube after installation, there will be problems. One way to solve the problem is to replace the breathing tube with a capillary tube. Compared with the breathing tube, the inner aperture of the capillary is smaller (about 1/10 of the breathing tube) and the tube is longer, so that even if the capillary is not sealed, the overall performance of the insulating glass after installation at high latitudes can be guaranteed. However, to date, there is no laboratory data to support this claim. In fact, there is still a debate in the North American insulating glass industry about the durability and life of the insulating glass installed capillary or breathing tube; even if the insulating glass installed capillary passes the ASTM773/774 testing standard, it does not mean that the actual sealing life can reach 5 years.
Evaluation of breathing tubes and capillaries
Due to the use of argon to fill the insulating glass, people have to seriously consider the height limit. The external air is exchanged with the gas in the hollow glass through the breathing tube. As a result, the inert gas concentration in the hollow glass is greatly reduced within a few months after installation. When the hollow glass window filled with argon is transported to the mountains, in order to install the hollow glass filled with argon as far as possible in the high latitude, without reducing the sealing integrity of the hollow glass, the breathing tube should not be used as much as possible. It has been demonstrated that the durability of insulating glass using butyl and silicone rubber double seal structure has excellent structural integrity. In most cases, the strength of the glass itself becomes a factor in the higher latitude limit of the insulating glass. There are two different situations of height limit: the altitude limit where the insulating glass can be installed and the height limit in the transportation of the insulating glass.
Hollow glass can be installed altitude limit
The limit of installing insulating glass at high latitudes needs to consider two worse situations: hot summer (hot air), aging of glass strength, and long-term load. This long-term load makes the high latitude of the insulating glass and the general conditions of the wind load under the hollow glass, its strength is reduced by 50%. It can be seen from Table 2 that in some cases, the latitude limit of glass use can be determined according to the strength difference between ordinary glass and tempered glass. Where possible, hollow glass of tempered glass filled with argon gas shall be substituted for the hollow glass of ordinary glass containing air to which the breathing tube is fitted. At high latitudes, all sealed insulating glass will flex outward. The extent to which the outward deflection results in a line-of-sight deformation of the insulating glass is subjective. The solution to this problem is to install a breathing tube on the insulating glass.
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