This standard specifies various sealing performance test methods. Tests Qa and Qc are rough checks, and observe the bubbles emerging from the leak. Test Qd is to observe the leakage of liquid under heating conditions; Tests Qk and Qm are to detect fine leaks with tracer gas; Tests Qf and Ql are to make liquid enter it through the leak under pressurized conditions, and then measure its performance change . This standard is applicable to testing the sealing performance of various electrical and electronic products, and is also applicable to the sealing performance testing of other sealing parts.