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Using Pre-cured Sealants in Construction Applications by Jason Bakus All photos courtesy Sealex Inc. SILICONE’S EXCELLENT AGING CHARACTERISTICS, RESISTANCE TO ULTRAVIOLET (UV) LIGHT AND WEATHERING, AND LONG EFFECTIVE LIFE SPAN HAS MADE PRE-CURED SEALANTS A POPULAR MATERIAL FOR CONSTRUCTION- RELATED APPLICATIONS. Pre-cured sealants of silicone are produced by extruding elastomeric sealant material and allowing it to cure to a rubbery, flexible product in a controlled manufacturing environment. They are packaged in cured form—often in rolls—instead of typical liquid form packaging such as tubes or pails. The sealant is installed using a thin layer of adhesive on each side to attach to the substrate being sealed. The material is then pressed into the adhesive to ensure adequate contact between the pre-cured sealant and the adhesive, as well as between the adhesive and the substrate. With the outer edges adhered to the substrate, the middle of the pre-cured sealant material (which is not bonded) acts as the area for expansion and contraction. Pre-cured sealants are most commonly produced as flat extrusions with a thickness of approximately 2 mm (0.08 in.) and widths varying 28 the construction specifier | march 2013 CS_Mar2013.indd 28 2/14/13 10:02:26 AM