A research team has introduced an innovative intumescent fire protective coating specifically designed to protect steel surfaces. The coating, based on epoxy resin (EP), combines ammonium polyphosphate (APP) with copper oxide (Cu₂O) in varying ratios. Testing involved applying a 2 mm thick layer of the coating to steel plates. Enhanced safety and reduced smoke productionBeyond thermal protection, the optimized formulation significantly reduced fire hazards. The research highlights the APP/Cu₂O system’s ability to form an intumescent layer with high expansion and excellent insulation properties.