In the flowing glass roof of the Chadstone Mall in Melbourne, the flexible warm edge system with Ködispace 4SG ensures that the cold-bent insulating glass is permanently gas-tight.

Modern glass architecture places extreme demands on the permanent energy efficiency and gas-tightness of the insulating glass. H.B. Fuller’s Ködispace 4SG is a high-performance warm-edge system that is suitable for demanding structural glazing projects – such as the Chadstone shopping mall in Australia.

The three-dimensional shape of the more than 7,000-square-meter roof construction results from steel knots, rods and edge beams. They carry 2,672 cold-bent insulating glass units with the thermoplastic spacer Ködispace 4SG as a warm-edge system.

Not one of the 1.2- to 8-square-meter insulated glass units is identical to one of the others, as each one has to adapt differently to the organic shape of the building. For this purpose, the 39-mm thick double insulating glass was cold bent and fixed in their respective profile during installation. Cold bending also deforms the edge bond which can easily lead to leaks in the space between the panes of conventional spacers. The warm edge with Ködispace 4SG compensates for the deformations, as the reactive polyisobutylene chemically bonds both to the glass surface and to the silicone sealant, thereby “blending” the entire edge bond to form a flexible and resilient unit.

The high load capacity of the spacer was demonstrated by experimental component tests as well as by finite element simulations. Thus, Ködispace 4SG ensures excellent long-term stability and permanent gas-tightness even with curved insulating glass units, according to the company.