Abstract
ABSTRACTUse of silicone adhesives for structural bonding of glass panels to metallic frame is a well‐established technology in façade applications. Selection of silicone technology is mainly driven by the unique UV resistance and thermal stability offered. However, are these the only factors that can drive technology selection in facade applications? Comprehensive experience gained by Sika over the last 50 years for applications in the Transportation Industry proves that polyurethane (PU) technology can offer valuable opportunities also for structural glazing applications in façades, although PU are usually more sensitive to UV radiations. Provided that existing protective measures are implemented to control UV exposure of bond lines, potential of PU technology in facades can be significant. In this paper, mechanical and application properties of Sikaflex®‐268 PU adhesive are presented and compared to Sikasil® SG‐500, a typical silicone used for structural glazing applications in facades. Comparison of mechanical behavior is based on tests performed at different temperatures, after curing as well as after accelerated aging. Results prove outstanding mechanical performance of Sikaflex®‐268 versus Sikasil® SG‐500, making the PU adhesive especially suitable for those systems where needs for transferring high loads exist. In blast scenarios, Sikaflex®‐268 high‐strength performance under highspeed deformations can introduce significant opportunities for joint reduction or for extending design feasibility in critical systems. Benefits offered by Sikaflex®‐268 are not only limited to its mechanical performance but also to the available application solutions. Boostered version of the product exist for both pump equipment and gun dispenser, with two major advantages in façade applications: a) fast curing during production as well as site applications or reglazing b) no limitations in joint dimensions, which confirms the adhesive potential for design in blast scenarios
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