Gas Mask - Use of A Mask

Use of A Mask

A modern mask typically is constructed of an elastic polymer in various sizes. It is fitted with various adjustable straps which may be tightened to secure a good fit. Crucially, it is connected to a filter cartridge near the mouth either directly, or via a flexible hose. Some models contain drinking tubes which may be connected to a water bottle. Corrective lens inserts are also available for users who require them.

Masks are typically tested for fit prior to actual use. After a mask is fitted, it is often tested via various challenge agents. Isoamyl acetate, a synthetic banana flavorant, and camphor are often used as innocuous challenge agents. In the military, the use of tear gases such as CN, CS, and stannic chloride in a chamber may be used to give the users confidence in the efficacy of the mask.

When the mask is used in a real scenario, or as part of a drill, there is 9 seconds to put the gas mask on and clear and seal. Hold the breath and close the eyes, pulling the gas mask out of its carrying case and put the mask on, exhale hard to purge any contaminants from the interior of the mask, put a hand over the canister hole, and take a breath: the mask should collapse onto the face to provide a seal. Once the mask is cleared and sealed, tighten the straps. The wearer may put on further protective clothing after the mask.