A novel epoxy-based self-intumescent fire protective coating has been developed by formulating a combination of ammonium polyphosphate (APP) and copper (I) oxide (Cu2O) in epoxy resin (EP). The effects of various combinations on fire protective performance for steel plate were evaluated using a lab-scale simulated big panel test. Formulations with different mass ratios of APP to Cu2O ranging from 10:0 to 2:8 exhibit good fire protective performance for steel plate. The EC Tech Report Water-borne Epoxy Coatings offers valuable insights into sustainable materials, PFAS-free additives, and innovative technologies. Perfect for those looking to optimize their formulations and deepen their knowledge in epoxy coatings.