Silicone defoamer for solvent-free and solvent-borne coatings, printing inks, and ambient curing plastic systems on the basis of epoxy resin and polyurethane. Standard silicone defoamer for all solvent-borne systems. Good balance between effectiveness and compatibility. BYK®-066 N is a highly effective air release agent, which reduces the formation of foam during the manufacture and processing of epoxy resin and polyurethane systems in order to achieve bubblefree surfaces.