Sealed Unopened C2A1 Military Grade M40 Gas Mask Canister Biological Chemical 

The serial number 4240-01-361-1319 refers to the C2A1 Chemical-Biological Mask Canister, 

a standard military-grade filter primarily issued for the U.S. Army's M40 and M43 mask series. 

The C2A1 is a cylindrical, 40mm NATO-threaded filter designed to provide respiratory protection against a specific range of warfare-related threats. 

• Primary Protection: It is engineered to remove toxic or irritating chemical vapors, warfare gases, and particulate contaminants, including biological organisms.
• Filtration Technology: The canister uses a combined particulate filter and a carbon bed containing ASZM-TEDA whetlerized charcoal. The particulate filter is tested to be at least 99.99% efficient against 0.3-micron aerosols.
• Design: It features a green body, distinguishing it from older black-bodied C2 filters that contained chromium.
• Shelf Life: Unopened filters stored in their original factory-sealed metal containers are reported to have a shelf life of up to 50 years. 

While effective for its intended military purpose, this filter has significant limitations for industrial use:

• Industrial Chemicals: It is not designed to remove industrial-type gases or vapors.
• Approval Status: This canister is not NIOSH approved for occupational use.
• Disposal: Due to the specific charcoal used, it must be managed as hazardous waste according to standard military procedures when disposed of. 

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121825 CC