One of the simplest and most effective fire protection methods for building structures is the application of a fire retardant intumescent coating on the surface of a structure. These swelling (intumescent) type coatings are widely used today. Intumescent coatings can increase the fire resistance of polymer compositions, but they have insufficient chemical resistance, resistance to high humidity. As a result, corrosion pockets appear on the surface of the steel structure and under the coating during long-term operation, the coating peels off, and cracks appear on it, and adhesion decreases. The purpose of this work was to determine the effect of a film-forming substance (binder) on the resistance of intumescent paints to the action of a corrosive atmosphere. For this, intumescent compositions with three different binders were made. The paint composition was applied with a brush to metal plates. For the experiments, samples of St 3 were used. The problem was solved, which was aimed at studying the heat-insulating properties of the studied coatings and the microhardness of metal samples under it. As the main criterion for evaluating the fire retardant properties, the heating time of the metal substrate of the sample was used. It was revealed that three paints obtained satisfactory results and can be used in industry. But epoxy binder paint got better results.