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gas mask,

face covering or device used to protect the wearer from injurious gases and other noxious materials by filtering and purifying inhaled air. In addition to military use (see chemical warfarechemical warfare,
employment in war of incendiaries, poison gases, and other chemical substances. Ancient armies attacking or defending fortified cities threw burning oil and fireballs. A primitive type of flamethrower was employed as early as the 5th cent. B.C.
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), gas masks are employed in mining, in industrial chemistry, and by firemen and rescue squads. The gas mask consists essentially of a face cover with two eyepieces and a mouthpiece that communicates with a canister containing a filter. The filter absorbs noxious gases as they pass through the canister to the mouth. The face cover also has a one-way outlet valve for exhaled air. See poison gaspoison gas,
any of various gases sometimes used in warfare or riot control because of their poisonous or corrosive nature. These gases may be roughly grouped according to the portal of entry into the body and their physiological effects.
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Gas Mask

 

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 (the air breathed is regenerated in the cartridge of the gas mask).

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 N. D. Zelinskii 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 facepiece (helmet), and a carrier (pouch). As it is inspired, the contaminated air enters the canister. Aerosols are removed in the aerosol filter, and vapors and gases are removed in the layer (chemical absorber) of activated charcoal. The air decontaminated in the canister passes through the connecting tube under the facepiece of the mask. The facepiece consists of a rubber helmet-mask with goggles and a valve unit. The gas mask set includes means to prevent the goggles from steaming up (a special pencil and an antisweat film). In the winter, insulating packing is mounted on the eyepiece rings of the helmet-mask. The mask can be used for an extended period of time and weighs about 2 kg.

Isolation-type oxygen masks are used in cases where filtering masks do not provide protection, for example, where there is a deficiency of oxygen in the environment. A distinction is made between oxygen masks based on the use of chemicals and those using compressed oxygen in containers. In the first kind, air that is exhaled enters the cartridge where water vapor and carbon dioxide are absorbed and oxygen is given off; the air then passes into the breathing bag. When inspired, the air passes again from the bag through the cartridge and enters at the bottom of the facepiece. The process is repeated for each breathing cycle. This kind of gas mask can be used from one to three hours and weighs 4–4.5 kg. In the isolation-type mask based on the use of compressed oxygen, when the exhaled air enters the cartridge the carbon dioxide is removed and the air passes into the breathing bag, to which oxygen from the bottle is fed simultaneously. When inspired, the oxygen-enriched air enters at the bottom of the facepiece of the mask. This kind of mask can be used for one or two hours and weighs roughly 9 kg.

M. I. PROSTOMOLOTOV

gas mask

[′gas ‚mask]
(engineering)
A device to protect the eyes and respiratory tract from noxious gases, vapors, and aerosols, by removing contamination with a filter and a bed of adsorbent material.
References in periodicals archive ?
lower operational costs for gasmasks (reduced number of filter changes)
But experts have warned that gasmasks are useless against a chemical like sarin which affects the body through the skin.
The protestors who instigated the violence were youths wearing gasmasks and face-covering scarves, reported Reuters.
This is the world of gasmasks in the rain, gravy browning on legs, girdles, chenille table cloths, linoleum, outside toilets, and Clarke Gable and Vivien Leigh at the pictures.
When gasmasks were issued in cardboard boxes my mam put a block of Cadbury's chocolate inside it saying 'You can only eat the chocolate if you are trapped in the air raid shelter at school to give you strength.
As kids we were scared running home from school with our gasmasks.
We had some really hard times, like running in fear when we saw the Zeppelins in the First World War, wearing gasmasks in World War II and then having to cope with rationing.
In 1997, BIANA signed the first contract with the Hellenic Armed Forces for supplying them with gasmasks and filters.
The men scrambled to open the protective cans on their Polivalente-Z gasmasks.
Deciphering the text I found it had something to do with alcohol, and sure enough there was a photo in the handbook, it was a syringe for antifreeze liquid for the eyepieces of gasmasks.