Abstract: The determination standards of explosion index at home and abroad are compared and analyzed from the aspects of determination principle, test device, test concentration, result expression and safety requirements. The requirements of test devices in domestic and foreign standards are the key parts of comparative analysis. It is found that there are significant differences in the flexibility, test principle, result expression and safety requirements of test devices between domestic and foreign standards. The domestic standard needs to be improved in terms of the flexibility of the test device, and it is necessary to refer to the relevant research and standards to formulate more strict and clear regulations. The domestic standard should consider turning to absolute pressure to improve the accuracy and reliability of the test.

Key words: combustible gas, explosion index, determination standard, explosion standard