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Chemical-Biological Mask: Field M40
After experimentation with the XM30 Mask (adopted as the MCU-2/P), the M40 Gas Mask entered service in 1987 as the standard replacement for the M17 Field Protective Mask.
M40 Gas Mask
Field Protective Mask, M40 provides respiratory, eye and face protection against chemical and biological agents, radioactive fallout particles, and battlefield contaminants. The M40 is the mask issued to dismounted soldiers. The closely related M42 Combat Vehicle Crewman Mask is used by soldiers mounted in vehicles. Ground forces of the U.S. Army and Marine Corps are the primary users of the M40 Gas Mask, with selective use by other services.
Pre-Planned Product Improvement (P3I) Programs developed the M40A1 (1992) and M40A2 configurations of the M40 Gas Mask. The improvements include a quick-doff hood, second skin, voice amplification (M7), revised nosecup, two new carriers, and improved vision correction.
M40 Gas Mask Description
The mask consists of a silicone rubber facepiece (made in small, medium, and large sizes) with an in-turned peripheral face seal, binocular rigid eye lens system and elastic head harness. Other features include front and side voice transmitters, a drinking tube that mates with the M1 canteen cap, clear and tinted inserts, and a filter canister with NATO standard threads. The combination of M40 mask features allows the mask to be worn continuously for 8 to 12 hours.
The face-mounted canister containing the gas and aerosol filter can be worn on either the left or the right cheek. It has capacity to withstand a maximum of 15 nerve, choking, and blister agent attacks. It will also withstand a maximum of two blood agent attacks. Biological agents do not degrade the filter. The technical description includes these parameters:
The M40 series of gas masks are manufactured by ILC Dover, Frederica, DE. The standard nomenclature and other information for the M40 series of Protective Gas Masks is tabulated below. NSN includes mask, carrier, filters, waterproof bag, eyelens outserts & hood.
Technical Manuals for the M40 series of gas masks include:
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