CompositesWorld
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49 CompositesWorld.com NEWS N E W S N S N E W S E N W S W High-Rise FRP HOW TO INCREASE FIRE-BARRIER RESISTANCE? THE ANSWER >> LOCTITE BENZOXAZINE PREPREG ALL BENEFITS ON BOARD WITH LOCTITE BZ 9705.2 AERO >> For APUs and other aircraft structures, this benzoxazine prepreg off ers you: Henkel is engineering the future of composites: Find your answer at www.henkel-adhesives.com/aerospace > outstanding fi re-barrier resistance > structural performance at high service temperature > compatible with automated processing > low cure shrinkage, and springback > superior damage tolerance > improved sustainability > global availability 7), producing an integrated, ready-to-install façade panel. Kreysler points out that when Enclos loaded completed panels on a fatbed truck for shipment to the SFMOMA job site, the average 10 panels per truck was twice the number of heavier GFRC panels that could have been carried. At the job site, one of two tower cranes removed each panel and hoisted it to the appropriate location for installation. "At one point, they were installing 19 panels per day," Kreysler recalls. "Which is why we were the frst subcon- tractor to begin production. We had to have the necessary panels ready prior to the installation schedule." He explains that his company could CNC-machine only four molds for the unique panels per day and knew that once installation began, panels would go up much faster than he could produce them, so he used that knowledge as the basis for calculating the production rate he could maintain for the project, then added a cushion for contingencies. "You must meet the production rate you commit to in the contract," Kreysler points out. "If you fall behind, you can be liable not only for a delay in opening the building, but also for delaying the other subcontractors." With monetary penalties that can easily reach six fgures per day, there is little room for error. Mitigating risk Understanding and avoiding such liabilities, was in fact, the biggest challenge in this, the company's biggest FRP project, says Kreysler. "We had to identify where the risk was and how to mitigate that." High on the list was façade color. "Color consistency was critical," Kreysler points out. "Tis project would last over a year, but the gel coat color consistency was only guaran- teed for 90 days. We were also adding inorganic fllers, whose colors vary. So this required a lot of efort on our part." Long before production, the company spent signifcant time with gel coat supplier Polynt Composites, fnalizing what the latter would guarantee in terms of color matching and then making sure that was written into Kreysler & Associates' build contract. "We could not promise a better color consistency than the resin supplier could provide," Kreysler notes. Te sand in the gel coat raised another concern. "Tere is no guarantee that one scoop would be the same color as the next," says Kreysler. To minimize inconsistency, Read this article online | short.compositesworld.com/SFMOMAfrp Read more about unitized wall systems in "The building envelope: FRP unitized façades" online | short.compositesworld.com/RELAXED Read more about Fireshield 285 passing the NFPA 285 fire test in the following: "Fire-resistant composite cladding opens endless options for designers" online | short.compositesworld.com/Fireshield "Architectural composites: Rising to new challenges" online | short.compositesworld.com/ArchComp