Abstract: An ultraviolet curing chamber having a window comprised of multiple plates of quartz which are connected with a sealing device. The sealing device is comprised of a ribbon of high compliance material having a central member and cross members. The cross members are spread apart before application of the device to the quartz plates, and after application, the central member lies between the edges of the plates and the cross members, which have returned to a position closer to their original position before having been spread apart and are biased against the top and bottom surfaces of the plates, creating a tight seal.