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CBRN Gas Mask Filter NBC-77 SOF 40mm Thread - 20 Year Shelf Life


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

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The NBC-77 SOF filter canister, in combination with a full-face mask, mouthpiece assembly or PAPR provide reliable protection of air passages against a wide range of harmful and highly toxic substances including all known CBRN agents. Filters are produced with standard round threads according to STANAG 4155 (EN 148- 1)- Rd 40x1/7" or GOST 8762-75 - 40x4 mm. Filter components are made of hard plastic. It provides a very robust product which is extremely durable against shock and impact damage in operational use.


The filter canister in connection with suitable respirator or PAPR provides protection against solid and liquid particles, pepper spray (OC), smoke producing substances, radioactive particles, bacteria and rickettsia, fungi, toxins, viruses, Riot Control agents (Lachrymators, Sternutators, Vomiting agents), Blister agents (Vesicants), Chocking agents, Blood agents, Nerve agents, Incapacitants, Herbicides, Pesticides and TIC, such as bromoacetone, CS, CR, CN, CNC, CNS, CA substances, organic compounds of arsenic - diphenyldichlorarsine - CLARK I (DA), diphenylcyanoarsine - CLARK II (DC), adamsite (DM), diphenyldichlorarsine (DA), ethyldichlorarsine (ED), methyldichlorarsine (MD), mustard gas (H), sulphur mustard gas (HD), T-mustard gas, Q-mustard gas, nitrogen mustard gases (HN1, HN2, HN3), lewisite (L), mixed mustard gas (H-L), phosgene oxime (CX), phosgene (CG), diphosgene(DP), chloropicrin (PS), hydrogen cyanide (AC), cyanogen chloride (CK), arsine (SA), G-agents: sarin (GB), cyclosarin (GF), soman (GD), tabun (GA), IVA (GV), V-agents: VX, VR, VE, VG (amiton), VM and toxic industrial chemicals such as: fumes of organic or inorganic acids, hydroxides, organic solvents with the boiling point above 65 °C, ammonia, amines, inorganic and acid gases, agricultural chemical combustion gases, other toxic substances, e.g. benzene, toluene, vinyl chloride, fluorine, hydrogen fluoride, sulphur oxides, chloracetic acid, aldehydes, mixtures of inorganic acids, and organic substances, mercury vapours, radioactive iodine, organic compounds of iodine (Iodomethane, 129, 131), radioactive particles, etc.


Breakthrough time of a filter is tested according to EN 14387+A1 at humidity 70% and flow rate 30 l/min, which is equivalent to the volume of air per minute used by an average person carrying out medium heavy work. The approximate lifetime (usage time) of a filter may, under normal conditions, calculated by comparing the concentration at the workplace and the minimum Dynamic Adsorption Capacity (DAC) for the filter.


The filters are sealed in plastic bags by the manufacturer. Store the filters unopened in a clean place at even temperature, most appropriate at -5 to +30°C and relative humidity below 80%. Sealed filters tolerate also conditions of -30 to +50°C and RH below 95%. The storage period (month and year) for filters 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, the filters are special refuse. Make sure that they are disposed of according to the filtered substance (gases or particles) in accordance with 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 for disposal advice and locations.


Testing Gas
Concentration of testing gas
Breakthrough time in minutes EN requirement
DAC in grams NBC - 77 SOF
ppm mg/I
A2 Cyclohexane C₆H₁₂ 5000 17.5 35 39 20,475
B2 Chlorine Cl₂ 5000 15 20 45 20,250
Hydrogen Sulphide H₂S 5000 7.1 40 >80 >17,400
Hydrogen Cyanide HCN 5000 5.6 25 50 8,400
E2 Sulfur dioxide SO₂ 5000 13.3 20 25 9,975
K2 Ammonia NH₃ 5000 3.5 40 50 5,250
Hg Mercury Hg ------ 13 mg/m³ 100 hours >170 hours >3900
SX Cyanogen chloride CICN 2500 6.28 20 25 4,710
Chloropicrin CCI₃NO₃ 5000 33.55 20 44 44,286
Phosgene COCl₃ 5000 20.24 20 >77 >47,058
REACTOR Methyloidide131 CH₃I - - 2 hours >2 hours


dimensions w x h

110 x 85 mm
weight 335 g
connection thread STANAG 4155 / EN 148-1 or GOST

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Dave Y

LEO approved

I work as a law enforcement officer in Southern California so being prepared is part of my job. I purchased a set of Mira NBC-77 SOF filters because it’s one of the only true CBRN filters available to the civilian market. They are rated for A2B2E2K2HgSXP3 D R, with a DIN rated 58621 Reactor element. The letters stand for the different classes of contaminants, and the numbers next to it show which concentration of these elements the filter can handle. I attached some pictures that help break this down. The D stands for dust (just means it will filter out dust), and the R stands for reusable. If the filter is used for mercury vapor filtration, it’s only meant to be used for a maximum of 50 hours. If any filter is used with highly toxic substances, it’s only meant for single use. DIN is a European rating agency that specifically tests the Reactor, which is meant to filter out radioactive iodine. I have not used these filters, and hope that they sit in my patrol car for the entire 20-year shelf life untouched. But, if they need to be deployed, I feel much better about having a product that covers everything as opposed to just a few different gases.


20 year expiration!! - Amazon Review

You pay a little more for these gas mask filters, but they last a lot longer and are rated for CBRN protection. Standard filter cartridges last 6 years and cost an average of $55. Over the course of 20 years, I would have spent $150+ to keep them fresh and up to date