Edgetherm 3600 hot-melt butyl sealant for insulating glass units is an active, single-part hot-melt butyl sealant that offers enhanced performance, productivity and durability compared to comparable technologies for IG, according to Quanex. It’s formulated with i-Boost, from adhesive company Bostik, to produce durable units at high application speeds, with no curing time and a short skinning time.