GB/T 6553-2014 focuses on the evaluation of electric marking and corrosion resistance of electrical insulating materials in harsh environments. It specifies test equipment in detail, such as electrode devices, test solutions, etc., clarifies sample preparation and test procedures, such as how to apply voltage, observe electric marking and corrosion phenomena, and provides results evaluation criteria. With this standard, the electric resistance performance of materials in harsh environments can be accurately evaluated, providing a key basis for the selection of suitable insulating materials for electrical equipment, ensuring the safe operation of equipment under harsh conditions, and improving the Reliability and service life of equipment.