The gas mask is a device for protecting the respiratory organs, eyes, and face of a person against toxic and radioactive substances, bacterial agents, and other harmful impurities in the air in the form of vapors, gases, or aerosols.
Gas masks are classified by their method of protection as filtering masks, whose action is based on decontamination or filtration of harmful impurities from the air inspired, and oxygen masks, which completely isolate the respiratory organs from the environment. Similarly, their special gas masks for military forces to protect them against toxic chemical attacks. You can also search for military grade gas mask on https://www.gasmaskpro.com/gas-masks
Filtration gas masks in the form of multilayered gauze bandages soaked with special solutions for protection against chlorine and phosgene appeared during World War I, but they were not effective against other toxic agents. In 1915 the Russian chemist invented the world’s first dry filtering gas mask with activated charcoal and a rubber mask.
In 1916 this gas mask was adopted by the Russian and Allied armies. Dry gas masks soon appeared in the armies of other countries. The present-day filtering gas mask consists of a canister, a helmet, and a carrier. As it is inspired, the contaminated air enters the canister. Aerosols are removed in the aerosol filter, and vapours and gases are removed in the layer of activated charcoal.