Henkel AG & Co. (Dusseldorf, Germany) offered a new fast-curing, high-strength polyurethane-based adhesive aimed at fast-cycle automotive structural composites. The single-pack adhesive, which requires no mixing, comprises an isocyanate wrapped in a urea envelope. The curing agent is stable at ambient temperature, but when it is heated to above 80°C/176°F it is activated. The envelope dissolves, allowing the adhesive to be applied, and then the adhesive hardens and cures in seconds, for a fast part cycle time. The company says the new adhesive is not affected by shop humidity, and because the activation temperature is relatively low, the adhesive is suitable for heat-sensitive substrates. It also offers constant mechanical properties over a wide temperature range.