Limitations

This work was done on clear, tempered 60 x 120 x 1 in.3 (1.52 x 3.05 m2 x 25.4 mm) insulating-glazing units to determine the durability of the secondary and primary seals through the ASTM E2190-10 [7] and ASTM E2188-10 [6] test­ing protocol. The data generated targeted a specific sized unit, a specific spacer system design, and a specific aspect ratio. It is unknown if this data applies to every case of IG size, glass make-up, and spacer system, and it is unlikely that it does. Before a project is undertaken mimicking this type of cold-bending, this testing should be repeated using actual sizes and anticipated bending dimen­sions. This is the first data generated on this topic of durability with cold­bending, and is likely just the beginning of many research projects on this topic. Cold-bending of IGUs is easiest when the units are attached to the glazing frame using structural silicone. It may be specified that cold-bent IGUs are to be used in a mechanically attached curtain-wall system, but the structural silicone used to attach an IGU to a frame is a combination adhesive and sealant, retarding air and water infiltration. Mechanically held cold-bent IGUs may put undue

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stresses on gasket systems that result in unwanted air and water infiltration. Because of the likeliness of structural silicone attachment of cold-bent glass the durability testing was done to the ASTM E2190-10 protocol, which uses a UV cycle in the test. This protocol is not the same as the EN1279 Glass In Building – Insulating Glass Units [18] protocol used in Europe. It is unknown if the two protocols produce similar results.