This standard is part of a series, specifically outlining a set of test methods for evaluating the physical, chemical, and environmental protective properties of conformal coatings (also known as protective coatings or conformal coatings) used to protect printed circuit boards. It provides detailed descriptions of how to assess the electrical performance (such as insulation resistance and breakdown voltage), mechanical properties (such as adhesion and flexibility), environmental resistance (such as resistance to damp heat, salt spray, and mold), and operational process performance (such as coating applicability and drying time) of these coatings. The related testing instruments mentioned in the standard include salt spray test chambers, mold test chambers, constant temperature and humidity chambers, adhesion testers, high-resistance meters, and breakdown voltage testers. This set of methods provides comprehensive testing criteria for ensuring that conformal coatings reliably protect circuit boards in harsh environments within the electronics industry.