Environmental Testing for Electric and Electronic Products: GB/T 2423.4-2008 Damp Heat, Cyclic Test Author：LINPIN Update Time：2025-08-02 Source：LINPIN GB/T 2423.4-2008 Damp Heat, Cyclic Test is an environmental testing standard for electric and electronic products, designed to evaluate the durability and reliability of products under high-temperature and high-humidity conditions. The standard specifies requirements for test equipment, test conditions, test methods, and the evaluation of test results. The test equipment includes a test chamber, heater, humidifier, and temperature-humidity controller. The test conditions are set at a temperature of 40°C ± 2°C and a relative humidity of 90%–95% RH, with a test duration of 48 hours. During the test, the product should remain in normal working condition, and electrical performance tests should be conducted. The evaluation of test results includes visual inspection, electrical performance testing, and mechanical performance testing. Visual inspection checks for surface oxidation, corrosion, discoloration, and other phenomena. Electrical performance testing covers electrical insulation, dielectric strength, grounding resistance, and other tests. Mechanical performance testing evaluates the product's heat resistance, moisture resistance, corrosion resistance, and other properties. The damp heat cyclic test is a widely used environmental test applicable to fields such as electronic products, electrical appliances, and mechanical equipment. This test helps assess the durability and reliability of products, providing valuable reference for product design, manufacturing, and quality control.
