GB/T 2423.33-2021 "Environmental testing Part 2: Test methods, Test Kca: High concentration sulphur dioxide test" specifies the conditions and methods for testing specimens in an alternating climate of condensate water containing high concentration sulphur dioxide. This standard is suitable for evaluating the adaptability of products and their materials in a chemical corrosion environment, but does not cover aspects such as specimen shape, preparation and evaluation of results. The test is designed to simulate the corrosion effect of a high concentration sulphur dioxide environment on materials and help evaluate the corrosion resistance of products in practical applications. The standard emphasizes that the test results cannot be directly used for the comparison of different anti-corrosion systems, as there may be significant differences between the test conditions and the actual application conditions.