This part of HG/T 5367 specifies the product classification, requirements, test methods, inspection rules and marking, Encasement and storage of fire-proof coatings for Rail trasit vehicles. It is suitable for fire-proof coatings applied to the underside surface of Rail trasit vehicles such as subways, light rails, trams, ordinary trains and high-speed trains. The coating must have the protective effect of heat insulation and fire resistance. Stability and integrity of the chassis structure can be guaranteed within a specified time after a fire, and at the same time, it has the protective effect of heat insulation on the back fire surface floor. Several criteria are cited in the specification, including Coating fineness of ground, non-volatile-matter content, hiding power, drying time, impact resistance, water resistance, heat resistance, flexibility, consistency, aging rating, abrasion resistance, resistance to neutral salt spray performance, etc.