Any combustible material can burn rapidly when in a finely divided form. If such a dust is suspended in air in the right concentration, under certain conditions, it can become explosible.

Flammable liquids can also give off enough vapor to form ignitable mixtures with air at normal room temperatures. As a result, they can pose a serious fire hazard.

Proper housekeeping in hazardous locations requires the use of equipment providing specific protection features.

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