We would like to help you with the problem of internal and external sealing and material flow in the insulating glass unit, which we have heard from many companies and you recently.
First of all, since the surroundings of tempered glass balconies are not enclosed, you should request to use butyl band, not butyl, as an interior sealing material, and silicone, not polyurethane, as an exterior sealing material. This is what needs to be done. Silicon is more resistant to sunlight. You should ask which silicone brand they use and which type of silicone you should use while mounting the glass from which insulating glass manufacturer dealer you buy. If you use incompatible silicone, leaks, flows in or out may occur in the insulating glass unit over time.
