The ISO 19277 standard provides conformity testing and acceptance criteria for protective coating systems under insulation used in the oil, petrochemical and gas industries. The standard specifies requirements for evaluating the performance of protective coating systems under insulation, with the aim of ensuring that the coating system effectively prevents corrosion, extends the service life of equipment, and provides reliable protection in harsh operating environments. The standard includes testing requirements for critical performance of coatings such as corrosion resistance, abrasion resistance, adhesion, etc. Through these rigorous testing and acceptance standards, coating systems are ensured to perform well under the complex conditions of the oil, petrochemical and gas industries, contributing to improved facility safety and operational efficiency.