The JJG (Light Industry) 77-1991 standard is the verification specification for salt fog test boxes, which stipulates the verification requirements and methods of salt fog test boxes. The specification describes in detail the technical requirements, verification items and methods of verification of salt fog test boxes to ensure that the test boxes can provide an accurate salt spray testing environment to evaluate the corrosion resistance of materials in salt fog environments. It is suitable for relevant laboratories and production enterprises to calibrate and verify salt fog test boxes to ensure the accuracy and Reliability of experimental results.