Safety performance of Insulated Glass
Due to the good thermal insulation performance of insulating glass, the temperature difference on both sides of the glass is large, which can also reduce the effect of cold radiation; when the outdoor temperature is -10°C, the indoor temperature in front of the single-layer glass window is -2°C while the insulating glass The temperature in front of the glass window is 13℃; in the same house structure, when the outdoor temperature is -8℃ and the indoor temperature is 20℃, the cold radiation area of 3mm ordinary single-layer glass accounts for 67.4% of the indoor space, while using double-layer glass Insulated glass (3+6+3) is 13.4%.
The use of insulating glass can improve the safety performance of the glass. When using the same thickness of the original glass, the wind pressure resistance of the insulating glass is 1.5 times that of ordinary single glass.
Design Points of Insulated Glass
1. The first seal of grooved aluminum double-sealed insulating glass is made of butyl rubber, which has extremely low water vapor transmittance; the second sealant mainly includes polysulfide rubber and silicone rubber. The water vapor transmittance of polysulfide glue is lower than that of silicone glue, but its UV resistance is not as good as that of silicone glue, so it is suitable for windows or framed glass curtain walls (because the aluminum frame can shade the sun and avoid direct sunlight); silicone glue is suitable for Hidden frame glass curtain wall has higher UV resistance and strength than polysulfide rubber. When the building has high decorative requirements for insulating glass, milky white or transparent silicone glue can be used. For wooden windows, silicone glue should not be used as the second seal because it has poor resistance to wood preservatives and the sealant will be damaged by migration.
2. The spacer aluminum frame should be of the continuous long-tube angle type, and the joints should be sealed with butyl glue; if the spacer aluminum frame adopts the four-corner plug-in type, each of its joints should also be sealed with butyl glue. The service life of insulating glass is not as good as the former. When the second sealant of the insulating glass uses silicone glue, the insulating glass with four-corner plug-in spaced aluminum frames should not be used.
3. Because it is sealed with sealant, it should not be used at temperatures of 70°C or higher, otherwise the service life of the insulating glass will be greatly affected.
4. Changes in the internal pressure of the air layer of insulating glass deform the glass and cause image distortion. Therefore, when using insulating glass at an altitude of 1000m or above, the air pressure of the air layer must be adjusted. This should be discussed with the glass supplier when placing an order.
5. The thermal insulation performance of windows is closely related to the window frame material, so window frame materials with good thermal insulation properties should be selected.
6. If used as a lighting ceiling, laminated or explosion-proof film should be used on the indoor side glass.
7. Low-E insulating glass, the membrane surface is located on the 2nd or 3rd side, which should be selected according to design needs. If the designed insulating glass must be in the form of large or small pieces, the membrane surface must be placed on the third side.
Low-e film reflects considerably more thermal radiation than traditional applied solar control films and is therefore a better insulator.
8. The maximum allowable area of the four-sided supporting insulating glass is 1.5 times the maximum allowable area of the insulating glass calculated based on the thickness of two single glass sheets.
9. The following technical performance requirements should be put forward during building design: thermal insulation performance, thermal insulation performance, sound insulation performance, lighting performance, sealing performance, and weather resistance.
Warm edge sealing system
(1) For insulating glass for doors and windows, a separate rubber strip sealing system can be used as a single-pass sealing method, which can ensure that the insulating glass has a service life of more than 10 years. When using insulating glass for curtain walls, structural adhesive must be sealed on the outside of the strip as a secondary sealant to ensure that the insulating glass has sufficient structural strength.
(2) It is particularly suitable for the production of special-shaped insulating glass and inflatable insulating glass, especially for the use of special-shaped inflatable Low-E insulating glass. Because the strip itself has no volatile gases that will adversely affect the Low-E film layer, it can ensure that the Low-E insulating glass is hollow. Glass has a long lifespan.
(3)Super spacer insulating glass
For insulated glass for windows, hot-melt butyl glue of sufficient depth can be sealed on the outside of the super spacer to ensure that the insulated glass sealing system has sufficient resistance to water vapor penetration. For insulating glass used in curtain walls, a third layer of structural glue of sufficient depth must be sealed on the outside of the hot-melt butyl glue to ensure that the insulating glass has sufficient structural strength and service life.
Traditional warm edge partitioning system
(1)U-shaped strip insulating glass
Insulated glass for windows can only use hot-melt butyl glue as a separate sealing material. For insulated glass used in curtain walls, structural glue of sufficient depth must be sealed on the outside of the hot-melt butyl glue to ensure sufficient bonding strength and service life. When using inflatable insulating glass, great attention must be paid to the sealing of the U-shaped strip joints.
(2) Glue-injected aluminum strip insulating glass
It is basically the same as traditional aluminum strip insulating glass. It should be noted that because this product uses thermal insulation material to bond the two aluminum strips, the thickness of the entire aluminum strip must exceed 12mm to achieve it, and due to the heat insulation in the middle Due to the characteristics of the material, it is difficult to achieve bending processing at the corners, so when designing and using inflatable insulating glass, attention must be paid to the sealing control at the corners.
Process conditions
1. Control the prescribed size of the opening and the required thickness of the glass according to the wind load.
2. The insulating glass must be made and constructed, and the size cannot be changed. The opening for assembling the insulating glass should be rectangular and vertical. Pay attention to check the accuracy of its specifications.
3. Do not allow any surface of the insulating glass to be covered with paint or paper, as this will cause local overheating and lead to breakage.
4. The insulating glass must not be in direct contact with the frame.
5. Installation requirements should vary according to the type of material inlaid with insulating glass.
