Thermaline 400 GS is an epoxy-phenolic coating specifically formulated to handle high temperature (400°F/204°C) steel substrates exposed to conditions typically found under insulation. It has exceptional resistance to wet/dry heat cycling exposures found in these applications. It satisfies the NACE Standard Practice (SP0198) to handle corrosion under insulation (CUI) for both carbon steels and austenitic stainless steel substrates at elevated temperatures.