Oxygen Enriched Environment
As we saw in the last slide, the air we normally breathe contains 21% oxygen, and oxygen deficient air contains less than 19.5%. Oxygen enriched air, then, can be defined as air that contains more than 23.5% oxygen, and this type of air can increase the likelihood of ignition. Although oxygen is not flammable on its own, when combined with a combustible material (vapors, gases, and even dust) it has the ability to become flammable.
Examples of combustible materials include the following: wood dust, paper, oily clothing, butane, acetylene, and hydrogen.
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