- Aircraft, Vehicles and Equipment Factfile > M40/42 Chemical/Biological Protective Masks

M40/42 Chemical/Biological Protective Masks

Primary function: Provides respiratory, eye, and face protection against field concentrations of chemical and biological agents.
Protects against: Chemical and biological agent vapors, aerosols, toxins, and radiological fallout particles.
Protection probabilities:
95% against 5,000 mg-min/m3
75% against 20,000 mg-min/m3
50% minimum probability of achieving no more than .002 percent penetration of Bacillus globigii.
Breathing resistance: not greater than 55mm of water at 85 liter/min
Unit Replacement Cost: $157

Features: The M40/42 series field protective masks will replace the M17 (general purpose), M25 (vehicle crewman), and M9 (heavy duty) masks. The M40/42 masks consist of a silicone rubber face piece with an in-turned peripheral face seal and binocular rigid lens system. A face-mounted canister (gas and aerosol filter) can be worn on either the left or the right cheek, and withstand a maximum of 15 nerve, choking, and blister agent attacks. It will also withstand a maximum of 2 blood agent attacks. Biological agents do not degrade the filter. The mask is furnished in small, medium, and large sizes. It provides the user with unobstructed and undistorted forward vision, and corrective lenses can be obtained. The mask also permits intelligible speech, does not interfere with hearing and provides for a drinking capability while being worn. Because of these features, the mask can be worn continuously for 8 to 12 hours. Microphone air adapters will be provided for combat vehicle and aircraft applications.

Inventory: The Acquisition Objective is 277,069. 87% (241,714) of the AO will be met with current funding through FY 95.

Date last modified: 05/21/96

Last Modified on June 17, 1999