What Is an Explosive Limit?

Combustible substances (flammable gas, vapor and dust) and air (or oxygen) must be uniformly mixed within a certain concentration range to form a premixed gas, which will explode when encountering a fire source. This concentration range is called the explosion limit, or explosion Concentration limit. ^[1]

The explosive limits are different for different components of the mixed system. The same mixed system, due to initial temperature, system pressure,

The wider the explosion limit range of a flammable mixture, the lower the lower explosion limit and the higher the upper explosion limit, the greater the explosion danger. This is because the wider the explosion limit, the more chances of an explosion condition appear; the lower the lower explosion limit, the slighter the leakage of combustible materials will form the explosion condition;

(1) Join

Explosive limits of common substances

The unit of concentration is the volume percentage of air.

Class IA liquid (flash point below 73 ° F (22.8 ° C);

1. Explosion limit is the basis for assessing the fire danger of flammable gas liquid vapor, dust and other substances. The larger the explosion limit range, or the lower the lower explosion limit, the greater the fire danger.

2. Explosion-proof explosion-proof electrical equipment should be used in industrial places where the lower explosive limit is <10% of combustible gas.

3. Outside the explosion limit, no explosion will occur. ^[3]