QJ 990.7-1986 《Coating inspection method coating flexibility inspection method》 Related products

QJ 990.7-1986 "Coating inspection method" Coating flexibility inspection method specifies the flexibility inspection method of coatings after undergoing alternating high and low temperature tests. The standard applies to the performance evaluation of coatings under various environment conditions to ensure the Stability and durability inspection of coatings. The process involves bending the sample under the specified high and low temperature conditions to check the surface for crazing or peeling. The standard describes in detail the preparation of the sample, the requirements of the test equipment and the specific steps of the inspection method, providing technical guidance for coating mass control.