The NF A91-209-2012 standard specifies a test method for insulating coatings in metals and Miscellaneous Inorganic Coatings for cyclic heating under temperature layer conditions. The standard is designed to evaluate the heat resistance and Stability of insulating coatings under periodic heating and chilling down conditions. The standard describes in detail the requirements for test equipment, test conditions, temperature control, and number of heating chilling down cycles to simulate the effect of temperature changes on Coatings in practical applications. Through this test, the durability and thermal fatigue performance of insulating coatings in high temperature environments can be effectively evaluated to ensure their Reliability under high temperature working conditions, which is widely used in thermal protection materials in aviation, automotive, construction and other fields.