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Friday, February 4, 2011

Gas Mask

Gas mask invented during World War I to protest combatants eyes and lungs from poison gas, gas masks are used today to filter many airborne substances - dust, asbestos fiber, vaporized paint - as well as some gases used in chemical warfare. The protection gas mask cleans the breathed air by means of a filter of chemically impregnated fibers over a bed of adsorbent material - usually activated charcoal. Another type, the closed system rebreathing mask, uses a chemical dioxide and water from exhaled air, regenerating oxygen for breathing.

A modern military gas mask protects the wearer's face, eyes, and lungs from Air (blue arrows) is drawn in through a valve in the air purifying canister, which contain a filter for removing particles and an activated charcoal layer that absorbs and removes harmful gases. Exhaled air exits through a valve at the front of the mask.

Gas mask in industry include of mandatory safety equipment that use by employee that work in the plant. Gas mask in industrial uses is depend on the environment of the industry, the gas emit to the atmosphere come from the process and the rest of chemical reaction that emit gas. The filter on the gas mask is fitted to the kind of possible gases that available on the plant environment. Every filter just can absorb several type of gases but can't absorb all kind of gases. So to provide of gas mask should be conditioned with the plant environment.


  1. Most gas masks use sealing caps over the air intake to prevent the filter from degrading before use, but the protective abilities also degrade as the filter ages or if it is exposed to moisture and heat.