The following factors should be considered for the performance analysis of sealant:
(1) The ability to prevent gas leakage; (2) The ability to resist water vapor penetration; (3) The ability to resist ultraviolet rays; (4) The ability to prevent water seepage; (5) The bonding system is structural.
The necessity of double sealing
The sealing and structural stability of the insulating glass system is achieved by insulating glass sealant. Insulating glass always faces the influence of external water vapor penetration and temperature changes during its life. Therefore, the sealant must first be able to prevent external water vapor from entering the air layer of the insulating glass. After insulating glass is installed, it is often affected by external forces such as temperature difference, air pressure, and wind load from the outside. Therefore, the sealant is required to ensure the structural stability of the system. Obviously, ensuring the sealing of the insulating glass air layer and maintaining the structural stability of the insulating glass system are equally important. The tightness depends on the integrity of the structure, and the structure guarantees the stability of the tightness. Insulating glass system must adopt double sealing. The first sealant is used to prevent water vapor from entering, and the second sealant is used to maintain the stability of the structure. If the insulating glass system only uses a single-channel seal, the insulating glass sealant must not only play a sealing role but also play a structural role, but no glue can have excellent sealing and structure at the same time. Therefore, the result of single-pass sealing can only greatly reduce the sealing life of insulating glass.