Vacuum insulating glass lifetime
Vacuum insulating glass is mainly used in building envelope and industrial products (such as freezer doors, car and ship windows, etc.), and has to withstand the repeated effects of sunlight and high and low temperature changes during its lifetime. Te time to maintain its good performance is the key to the survival and development of vacuum glass as an industrial product.
Vacuum glass is different from laminated glass or insulated glass that contain organic materials:
- Laminated glass contain PVB or SGP interlayer,during its lifetime,rain/temperature and humidity will affect the interlayer and cause bubbles around glass edge,or delamination problem after years.
- Insulating glass contains butyl and silicon sealant, the rubble or sealant will aged and decrease its lifetime after years as well,IGU max lifetime is 25 years.
- Tempered glass has no lifetime as well,it can work if only glass don’t break.
Different from above normal architectural glass,vacuum glazing ,whether it’s sealed by glass solders or metals,the glass component are inorganic materials, every component,whether it’s sealing materials,glass itself,won’t get oxidized or aging after years,so vacuum glass can serve 25-50 years.
The so-called “vacuum glass lifetime” refers to the time that the high vacuum degree (≤0.1 Pa) in the vacuum insulating glass can be maintained.The main factors that cause the working vacuum to drop are:
The periphery of the vacuum glass are sealed with low-melting glass powder widely used in the kinescope industry.
The application practice for more than 80 years has proved that (the black-and-white TV came out in 1939, and the color TV came out in 1953): this sealing material is enough to meet the needs of Sealing requirements for various electric vacuum devices such as tubes (the allowable leak rate of electric vacuum devices is ≤10-12 Pa·m3/s).
The main factors affecting the life of vacuum glass The glass surface and body contain a large amount of gas. These gases are dissolved or adsorbed on the surface during glass melting or thermal processing, about 102 Pa·L/cm3. Under the action of external conditions such as temperature and light, these gases can be desorbed from the glass surface,or diffused into the vacuum layer.
Heating and baking are the main methods of degassing glass in the electric vacuum industry.Of course in our vacuum glass production,the sealing temperature is 250℃-350℃,under this high temperature the gas were removed from glass surface and inside and keep high vacuum degree.
In order to ensure the service life of the vacuum glass lifetime≥ 20 years, in addition to the above measures, a long-term getter has been installed in the vacuum glass to further improve the vacuum degree of the vacuum glass. The application practice of electric vacuum devices represented by picture tubes can prove that vacuum glass is a reliable and long-life static vacuum device.
Vacuum insulating glass produced by HaanGlas can reach 50 years,and offer up to 10 years warranty.
While be careful when handling,installing,and avoid damage before installation.
HaanGlas is your turnkey vacuum glazing manufacturer and supply,kindly contact us for your next great project.