Explosive substances: Some flammable substances are produced in many production sites. About two-thirds of the mines in the coal mine have explosive substances. In the chemical industry, about 80% of the production workshops have explosive substances. Oxygen: Oxygen in the air is ubiquitous. Ignition source: A large number of electrical instruments are used in the production process. Various friction sparks, mechanical wear sparks, static sparks, high temperature, etc. are inevitable, especially when the instrument or electrical fails.

Objectively, many industrial sites meet the explosion conditions. When the mixed concentration of explosive substances and oxygen is within the explosion limit, if there is a source of explosion, an explosion will occur. Therefore, it is necessary to take explosion protection.