Insulating Glass
The facades are mainly responsible for the energy balance of a building. The excellent thermal insulating effect of bonded double- or triple-glazed units with coated glass - sealed by dual-seal technology - can save much of the energy otherwise consumed for heating or cooling.
Insulating Glass Edge Seal
The secondary seal shall keep the glass panes tightly together and prevent too high movement in the IG edge seal. High-modulus adhesives are compulsory for long service life of IG units. Only silicones are approved as secondary seal in structural glazing facades. For windows and capped curtain wall facades PU are a good value-for-money alternative.
The primary seal is the main barrier against ingress of water and air humidity and loss of inert gas, e.g. Argon. Therefore a durable premium-quality butyl is a must in both air- and argon-filled IG units.