NBC-77 SOF CBRN Gas Mask Filter Canister 40mm Thread - NATO Respirators Compatible - Respirator Cartridge MIRA Safety

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The CBRN Gas Mask Filter NBC-77 SOF 40mm Thread is designed to provide protection against chemical, biological, radiological, and nuclear (CBRN) threats. It is threaded to fit a standard 40mm NATO gas mask and is certified to meet NATO standards for CBRN protection.   

The NBC-77 SOF filter features a unique combination of sorbents and catalysts that effectively neutralize a wide range of toxic industrial chemicals and warfare agents, including nerve, blister, and choking agents.

The filter provides reliable and effective protection for military, law enforcement, and first responder personnel operating in hazardous environments. 20-Year Shelf Life.

* IMPORTANT NOTE: Sales of all MIRA Safety products are final.


  • NATO Certified: The NBC-77 SOF filter is certified to meet NATO standards for CBRN protection, ensuring that it provides reliable and effective protection against a wide range of hazardous substances.
  • Wide Protection Range: The filter features a unique combination of sorbents and catalysts that effectively neutralize a wide range of toxic industrial chemicals and warfare agents, including nerve, blister, and choking agents.
  • Compact and Lightweight: Despite its high level of protection, the NBC-77 SOF filter is compact and lightweight, making it easy to carry and use in the field.
  • 40mm NATO Threading: The filter is threaded to fit a standard 40mm NATO gas mask, making it compatible with a wide range of gas masks and respirators.
  • Long Shelf Life: The NBC-77 SOF filter has a long shelf life, making it suitable for stockpiling and emergency preparedness. 20-year shelf life - save money long-term by not having to replace your filters every 5 years
  • Used by military personnel, CBRN specialists, and special operations forces all over the world
  • Filter all known CBRN agents, including radioactive iodine, rated for A2B2E2K2HgSXP3 D R.
  • Certified by European agencies and has the “CE” symbol. Compliant under EN 14387:2004 + A1:2008

The breakthrough time of a gas mask filter is tested according to EN 14387+A1 at a humidity of 70% and a flow rate of 30 l/min, equivalent to the volume of air per minute used by an average person carrying out medium-heavy work.

Under normal conditions, the approximate lifetime (usage time) of a filter may be calculated by comparing the concentration at the workplace and the filter's minimum Dynamic Adsorption Capacity (DAC).

The manufacturer seals each NBC-77 SOF gas mask filter in a plastic bag. Store the filters unopened in a clean place at an even temperature, most appropriate at -5 to +30°C and relative humidity below 80%.

Sealed filters also tolerate conditions of -30 to +50°C and RH below 95%. The filter's storage period (month and year) is marked on the filter label. Do not try to regenerate the filters. Never clean the filters with compressed air or compressed water.

After use, gas mask filters are considered special refuse. Please dispose of them according to the filtered substance (gases or particles) by current waste treatment regulations.

If the product is to be disposed of, it should be dismantled from the respirator and disposed of as solid waste. Please see local authority regulations and locations for advice on disposal.

Use Guide of NBC-77 SOF 

The NBC-77 SOF gas mask filter is unique because it combines the abilities of three filters in one without compromising on quality.

Typically, agencies would have to stock a CBRN filter for chemical warfare agents, an industrial filter for toxic industrial chemicals, and a Reactor filter for radioactive iodine.

Traditionally, CBRN filters were not very good at filtering out toxic industrial chemicals; industrial filters did not work for CBRN, and Reactor filters were solely for filtering out mythyiodide131 or methyliodide129 gas.

Logistically, this made it difficult for agencies to stock a different filter for each type of threat. With the NBC-77 SOF, users can now use one filter for all three types of threats, simplifying logistics and saving money with an extended 20-year shelf life.

Radioactive iodine (its organic compounds—mythyiodide131 or methyl iodide 129) is mainly created during reactions in nuclear power plants. Therefore, employees of power plants and people who live near a nuclear power plant need to be protected in case of leakage.

Reactor filters are also used in nuclear research institutions and during the transportation of nuclear material to hospitals where it is used for radiotherapy (for patients with cancer).

Reactor filters are also needed by first responders, police, and military for cases of accidents during the transport of nuclear materials or waste and cases of misusing radioactive materials by terrorists (dirty bombs).  


When used in conjunction with a suitable respirator or PAPR (Powered Air Purifying Respirator), the filter canister provides comprehensive protection against a wide range of harmful substances.

These include particulate matter, various chemical agents, and biological hazards. Below is an organized summary of the types of threats against which the filter offers protection:

Particulate Matter

  • Solid and Liquid Particles: Effective against a wide range of airborne particles.
  • Radioactive Particles: Shields against particles with radioactive properties.
  • Biological Hazards: Offers protection against bacteria, rickettsia, fungi, and viruses.

Chemical Agents

  • Pepper Spray (OC) and Smoke-Producing Substances: Provides defense against common irritants and smoke used in riot control or firefighting scenarios.
  • Riot Control Agents: Including lachrymators (tear gases like CS, CR, CN), sternutators, and vomiting agents.
  • Blister Agents (Vesicants): Protects against skin and mucosal damaging agents such as mustard gases (H, HD, Q, etc.), lewisite (L), and nitrogen mustards (HN1, HN2, HN3).
  • Choking Agents, Blood Agents, and Nerve Agents: Offers protection against lethal chemicals that interfere with oxygen absorption, affect blood's ability to carry oxygen, or disrupt the nervous system, including hydrogen cyanide (AC), cyanogen chloride (CK), G-agents (sarin, soman), and V-agents (VX, VR, VE).
  • Incapacitants, Herbicides, and Pesticides: Ensures safety from chemicals designed to incapacitate, as well as common agricultural chemicals.

Toxic Industrial Chemicals (TIC)

  • Protects against a broad spectrum of toxic substances encountered in industrial environments, such as:
    • Organic solvents and inorganic acids.
    • Ammonia and amines.
    • Benzene, toluene, and vinyl chloride.
    • Mercury vapors and radioactive iodine.

The NBC-77 SOF filter canister, in combination with a full-face mask, mouthpiece assembly, or PAPR, reliably protects air passages against a wide range of harmful and highly toxic substances, including all known CBRN agents.

The filters are produced with standard round threads according to STANAG 4155 (EN 148- 1)- Rd 40x1/7". The filter components are made of hard plastic. This results in a very robust product that is extremely durable against shock and impact damage in operational use.

* IMPORTANT NOTE: Sales of all MIRA Safety products are final.