This standard specifies the terms and definitions, product classification, requirements, test methods, inspection rules, labels, Encasement and storage of irreversible thermographic Coatings. It is suitable for irreversible thermographic Coatings formulated from temperature-resistant Resin, filler, additives and organic solvents. It is mainly used for temperature identification in rapidly rising and cooling environments such as aero-engines, gas turbines, industrial pipelines, etc. Among them, irreversible thermographic Coatings refer to the change of coating Color after being heated to a certain temperature, but cannot return to the original Color when chilled down. Single discoloration irreversible temperature Coating refers to the irreversible temperature Coating in which the film Color changes only once.