COMPARISON CHART


FILTER MODEL / PARAMETER	NBC-77-SOF	P-CAN®	VK-530	VK-700	NBC-17-SOF COMPACT	DotPro 330	PARTICLEMAX P3	P-CAN COMPACT
Summary	Protects against CBRN threats, riot control agents, toxic industrial chemicals, and radioactive methyl iodide.	Removes riot control agents with higher absorption than the P-CAN Compact.	Protects against toxic chemicals and converts CO to CO2, but not for full CBRN protection.	Special Combined Filter Cartridge offers broader protection and double the lifespan compared to the VK-530, filtering multiple harmful substances.	The lightweight NBC-77 SOF offers similar protection at lower concentrations, enhancing mobility without compromising safety.	Offers comprehensive Toxic Industrial Chemicals protection , mercury vapor filtration, and durability with a 5-year shelf life.	Removes 99.995%+ of particulates, offering superior filtration with larger size and weight savings.	The compact P-CAN efficiently filters riot control gases with significant weight and size savings.
External Approvals	EN 14387:2004+A1:2008, DIN 58621:2011	EN 14387+A1	EN 14387:2004+A1:2008, DIN 58620:2007, EN 143:2000+A1:2006	EN 14387:2004+A1:2008, DIN 58620:2007, EN 14387:2001	EN 14387 +A2	EN 14387:2004+A1:2008	EN 143:2000, EN 12941:1998, EN 12942:1999	EN 14387+A1
Country of Origin	Czech Republic	Czech Republic	Italy	Czech Republic	Czech Republic	Czech Republic	Czech Republic	Czech Republic
Rating	A2B2E2K2HgSX P3 D R REACTOR	A2SXP3 D R (OC, CR, CS)	A2B2E2K2HgNO20COP3R	A2B2E2K2HgNOCO20P3	A2B1E1K1 P3 D R	A2B2E2K2HgP3	P3 R D	A1SXP3 D R (OC, CR, CS)
Filter Thread Type	40 mm	40 mm	40 mm	40 mm	40 mm	40 mm	40 mm	40 mm
Breathing Resistance (typical)	<140 Pa at 30 L/min	<160 Pa at 30 L/min	<220 Pa at 30L/min	<190 Pa at 30 L/min	<200 Pa at 30 L/min	<190 Pa at 30 L/min	~60 Pa at 30 L/min	<200 Pa at 30 L/min
Diameter	110 mm	110 mm	106 mm	110 mm	90 mm	110 mm	110 mm	90 mm
Height	85 mm	75 mm	111 mm	95 mm	85 mm	85 mm	55 mm	85 mm
Average weight	335 g	290 g	500 g	450 g	205 g	360 g	100g	205 g
Shelf-life in storage	20 years	10 years	5 years	10	10 years	5 years	20 years	10 years
Provides protection from:
Particles	✅	✅	✅	✅	✅	✅	✅	✅
Organic gases & vapours (> 65°C)	✅	✅	✅	✅	✅	✅	❌	✅
Inorganic gases & vapours (not CO)	✅	❌	✅	✅	✅	✅	❌	❌
Acid gases	✅	❌	✅	✅	✅	✅	❌	❌
Ammonia and organic derivatives	✅	❌	✅	✅	✅	✅	❌	❌
Nitrogen oxides	❌	❌	✅	✅	❌	❌	❌	❌
Carbon monoxide	❌	❌	✅	✅	❌	❌	❌	❌
Mercury vapours	✅	❌	✅	✅	❌	✅	❌	❌
Radioactive iodine	✅	❌	❌	❌	❌	❌	❌	❌
Price	^$79.99 – ^$799.99	^$39.95	^$89.99	^$99.97	^$49.95	^$59.96	^$160.00	^$37.95
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NBC-77 SOF^® 40mm NATO Filter For Gas Masks - CBRN Filter, 20 Year Shelf Life

Name: NBC-77 SOF® 40mm NATO Filter For Gas Masks - CBRN Filter, 20 Year Shelf Life
Brand: MIRA Safety
SKU: FLT_6MNBC78
Price: 79.99 USD
Availability: InStock
Rating: 4.87 (402 reviews)

Check out the 402 reviews

Unmatched 20 year shelf life for cost-savings, long term storage
Compatible with commonly available 40mm NATO threaded respirators for interchangeability
Protects against a wide variety of known toxic CBRN agents, including radioactive iodine

^$79.99

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NBC-77 SOF® CBRN Gas Mask Filter

^$79.99

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Description

The NBC-77 SOF^® is our flagship 40mm gas mask filter, designed to provide comprehensive respiratory protection against a wide range of chemical, biological, radiological, and nuclear threats. When combined with a compatible full-face gas mask or PAPR, this NATO-standard filter helps protect your airways from all known CBRN agents, toxic industrial chemicals, radioactive iodine, organic iodine compounds, and hazardous particulates.

The NBC-77 SOF^® uses a standard Rd 40 × 1/7" thread in accordance with STANAG 4155 (EN 148-1), making it compatible with most modern 40mm gas mask filter platforms. Its rugged hard-plastic housing is engineered to withstand shock and impact in operational use, helping to protect the filtration media and preserve performance in the field.

New Color Options for the ^®40mm Gas Mask Filter

We’re excited to introduce two new color options for the NBC-77 SOF^® 40mm gas mask filter canister, giving you more flexibility to match your equipment to your environment:

Ranger Green: A versatile, muted green shade that blends well into woodland and mixed terrain environments. This color option provides excellent camouflage for tactical and field applications where visual signature matters.
Sandstone: A neutral, earth-toned color ideal for desert, arid, and rocky terrains. This option offers effective concealment in bright, sandy, or stone-dominated environments.

These new finishes join the existing lineup, providing even more versatility for a variety of operational needs. Whether you’re operating in dense forests, arid deserts, or urban environments, there’s now an NBC-77 SOF^® gas mask filter color to match your requirements, without any difference in performance or specifications.

Roman’s Take on the NBC-77 SOF^® Gas Mask Filter

The NBC-77 SOF^® is my go-to recommendation for anyone who wants a single filter that truly does it all. What makes it stand out is that it combines three major filtration capabilities: classic CBRN protection, coverage for toxic industrial chemicals, and DIN-rated reactor performance into one cartridge.

Typically, agencies would stock separate filters for CBRN agents, industrial gases, and radioactive iodine compounds like methyl iodide. With the NBC-77 SOF^®, you get all of that in one package. It’s rated for all known CBRN agents, covers a very wide range of TICs, and is one of the few consumer-accessible filters that’s actually tested and rated as a Reactor filter, meaning it can filter radioactive methyl iodide gas.

The second big advantage is shelf life. At 20 years, this filter outlasts most competitors by a factor of two or three. A lot of CBRN filters have a 5–7 year shelf life, which means you’d replace them multiple times over the life of a single NBC-77 SOF^®. When you look at the cost of ownership per year, this filter ends up being one of the most economical options out there, while still offering some of the broadest protection you can get.

From a preparedness standpoint, that combination is rare. You get long shelf life, real CBRN capability, strong coverage against toxic industrial chemicals, and nuclear-reactor-grade filtration in one unit. If you’re looking for a “one-and-done” filter to keep on hand for serious emergencies, this is the one I point people to.

Key Features of This NATO Gas Mask Filter

Compatible with standard 40mm NATO threaded respirators (Rd 40 × 1/7"), which are widely available and used around the world.
20-year shelf life when factory sealed, helping you save money over time by reducing the need to replace filters every 5–7 years.
Used by military personnel, CBRN specialists, and special operations forces worldwide, providing proven performance in real-world conditions.
Filters all known CBRN agents, including radioactive iodine, and is rated A2B2E2K2HgSXP3 D R REACTOR under EN 14387.
Certified by European agencies and marked with the “CE” symbol. Compliant with EN 14387:2004 + A1:2008.

Technical Data for the NBC-77 SOF^®Chemical Filter

Technical Data		Breathing Resistance in Pa Breathing Resistance in Pa
Diameter	110 mm	@ flow rate 30l/min. EN 1) NBC-77 SOF^® 260 <140	@ flow rate 95l/min. EN 1) NBC-77 SOF^® 980 <600
Height	85 mm
Weight	335 g ±5%
Storage time	20 years (factory sealed)

Filter Classifications for This 40mm CBRN Filter

Type and Class Particle filter efficiency @ flow rate 95l/m		Particle filter efficiency @ flow rate 95l/m
A2 - organic gases and vapors	SX - CG, CK, PS	Sodium Chloride NaCl (S) Paraffin oil (L)	EN 99.95 99.95	NBC-77 SOF^® >99.999 >99.999
B2 - inorganic gases and vapors	P3 - particles
E2 - acid gases and vapors	D- dust
K2 - ammonia and amines	R- reusable
Hg - mercury vapors	REACTOR - radioactive iodine

Note:
1) Standard EN 14387+A1
2) The filter was tested on dolomite dust clogging
3) Radioactive iodine and its organic compound - methyliodide¹³¹ acc. to standard DIN 58621

Application Range for This NBC Filter

The filter canister in connection with a suitable gas mask 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), choking 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 a 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, chloroacetic acid, aldehydes, mixtures of inorganic acids, and organic substances, mercury vapors, radioactive iodine, organic compounds of iodine (Iodomethane, 129, 131), radioactive particles, etc.

Testing Gas			Concentration of Testing Gas		Breakthrough Time in Minutes EN	NBC-77 SOF^®	DAC in Grams NBC-77 SOF^®
Testing Gas			ppm	mg/I	Breakthrough Time in Minutes EN	NBC-77 SOF^®	DAC in Grams NBC-77 SOF^®
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	Sulphur 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	>3.900
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	-

Service Life of the NBC-77 SOF^® Gas Mask Filter

Breakthrough time of a gas mask filter is tested according to EN 14387+A1 at 70% relative humidity and a flow rate of 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 the NBC-77 SOF^® filter may, under normal conditions, be estimated by comparing the concentration at the workplace with the minimum Dynamic Adsorption Capacity (DAC) specified for the filter.

Gas Mask Filter Storage and Maintenance

Each NBC-77 SOF^® gas mask filter is sealed in a plastic bag by the manufacturer. Store the filters unopened in a clean place at a stable temperature, ideally between -5 °C and +30 °C with relative humidity below 80%. Sealed filters tolerate conditions from -30 °C to +50 °C with relative humidity below 95%. The storage period (month and year) for filters is marked on the filter label.

Do not attempt to regenerate the filters. Never clean the filters with compressed air or water, as this can damage the filtration media and compromise protection.

Gas Mask Filter Disposal

After use, gas mask filters are considered hazardous waste. Make sure they are disposed of according to the substances filtered (gases or particles) and in accordance with current waste treatment regulations. Before disposal, remove the filter from the respirator and dispose of it as solid waste. Please see local authority regulations for disposal advice and approved locations.

⚠️ Note: Due to limited stock, the NBC-77 SOF^® gas mask filter may ship in Ranger Green or Sandstone instead of Black. Color may vary from images, but performance and specs are identical.

CLICK HERE FOR THE PDF BROCHURE

Questions & Answers

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I am aware that a P3 filter is required to block the coronavirus. Which one of your filters is P3?

MIRA Safety filters (NBC-77 SOF, VK-450, DOTpro 320) are classified as "combined filters" and contain a P3 filter along with activated carbon. For those that don't know what P3 means, it is a rating for a particle filter that blocks 99.9999%+ of particulates. As viruses travel in liquid aerosols and particulates, this filter (when coupled with a full face respirator) would prevent the Coronavirus from entering your breathing passages and eyes.
How long does a filter last once it's opened?

Filter use time depends on a few factors, including atmospheric conditions, contaminant type, concentration, along with your breathing rate. As a general rule of thumb, we would suggest having two filters per person per day for emergency evacuation purposes. If you'd like specific data on use time, you can look at the brochure that goes into breakthrough times along with the application.
Can a filter be changed out on a mask during exposure?

Typically, it's never recommended to swap filters while you're in the thick of it. We are also selling escape filters, so the goal is for you to get out of the danger zone as fast as possible.

If you ever find yourself in a situation where you'll need to hot-swap filters while in the thick of it, you'll need to get proper training in order to execute the "Mask Clearing & Sealing" procedure safely. We suggest doing independent research on procedures of this level, as these are typically only taught in professional institutions.
Viruses can only survive on surfaces for a period of a few days maximum. So if the only concern is only viruses like the coronavirus (and I don't have to worry at all about exposure to chemicals, etc.), why is it that gas mask filters cannot be reused after a few days, when any viruses that were on/in it will no longer be a danger?

For safety reasons, we cannot recommend reusing any filter. This would go against all safety standards set out by regulatory agencies all over the world regarding disposable filters.

If you insist on re-using a filter against COVID-19, it would be best to refer to CDC's guidelines. As new information is constantly being released regarding this virus, it would be best to refer to their updates on how long you'll need to quarantine an exposed filter before you can re-use it.
Could you explain the lifetime chart that tells the length of the filter use time? For example, H2S, what is the use time under your chart?

To calculate the breakthrough time of a specific contaminant, you would use the following formula: T=DAC x 1000/AF x C. T is the approximate usage time in minutes, DAC is the Dynamic Adsorption Capacity (in grams), AF is the airflow (liters per minute) where the default is 30 l/min under normal conditions, and C is the concentration of toxic gas in mg/l. At 5000ppm concentration, and 30 l/min airflow, the breakthrough time is greater than 80 minutes (the EU standard only requires 40 mins).
How long would this filter last in a dirty bomb scenario?

That depends on a few factors, including the type of contaminants released, concentration, your breathing rate, along with atmospheric conditions. If this explosion released radioactive Methyliodide¹³¹ (commonly released during such events) the European standard is set to a minimum of 2 hours breakthrough time. The NBC-77 SOF exceeds this standard and can be used for more than 2 hours.
If the NBC-77 SOF filter was to be completely submerged in water for a period of time, would it remain functional afterwards?

The NBC-77 SOF filter is not meant to be fully submerged in water, and we do not have any data to show if it will be effective. However, the installed P3 filter does act as a hydrophobic barrier to heavy rain, decontamination showers, and etc. This filter was specifically designed to prevent water from entering the lateral side (the first point of contact for air traveling into the filter).
Will the NBC-77 SOF filter remain functional after exposure to heavy rain, heavy snow and water/chemical decontamination showers?

Yes, it will, as the installed P3 filter has a special hydrophobic coating, specifically for use with decontamination showers and wet conditions.
Does this protect against smoke, if so how many times do i need to replace with the smoke

No, it does not. You would need a smoke escape filter that contains an oxidizing agent that will help convert CO to CO2, allowing you to breathe it out (click here for the link to the VK-530 Smoke Filter).
Will this fit the Scott 3M M110 Dual Lens Gas mask? How does this compare to the Scott CBRN filter?

Yes, it will, as the Scott gas mask uses a 40mm NATO threaded filter. I would suggest looking at the filter technical specs to see the difference. At first glance, it seems like the NBC-77 SOF is more capable as most contaminant filtration is rated at 5000ppm, whereas the Scott filter is only rated at 1000-1500ppm.
Will these filters fit a MSA millennium gas mask and a M40 gas mask?

Yes, they will, as all are threaded in the 40mm NATO configuration.
If I work with viral vectors every day, does it mean I must have a new filter every day? $80/day?

Yes, you would need a new filter every day, but you wouldn't necessarily need a high-end CBRN filter like the NBC-77 SOF.

For viral particulates, experts recommend using a P100 (P3) filter. We have a particulate filter that retails at $150 for 6 pieces (click here for the link to the ParticleMax P3).
Will this fit an S10 mask?

Yes, it will, as both are threaded for 40mm NATO.
Just to be clear, can I store a filter in a freezer bag under conditions written above, once it's opened?

You can re-seal a filter after it's opened, but we cannot guarantee that it will function the same as a freshly opened unit. As stated in previous Q&As, all figures are for freshly opened filters, as there are many variables that come into play once a filter is opened and/or used.
Does this filter fit the GP-5 gas mask?

No, it will not, as the GP-5 uses old 40mm GOST threading.
Will this fit the 3M FR 7800B CBRN Mask?

Yes, it will, as both are threaded for 40mm NATO.
Would this be compatible with the North by Honeywell Small Elastomer Full Face 5400 Series Dual Cartridge Facepiece?

No, it is not compatible as the North mask is not threaded for 40mm NATO filter cartridges.
What level filter will protect me from the Coronavirus and will this filter fit the MSA millennium gas mask?

For viral filtration, you would need a P3 particle filter (all of our filters have a P3 built-in). Since all of our filters are threaded for 40mm NATO, they should all fit the MSA Millenim mask.
Does this filter fit the Polish MC-1 gas mask?

This filter will fit any mask so long as the mask is in a 40mm NATO configuration. As the Polish MC-1 is an old gas mask it might be threaded in 40mm Soviet GOST. Make sure to double-check before making a purchase.
Will these filters work with an Avon C50 to provide proper CBRN threat protection?

Yes, they will, as both are threaded for 40mm NATO.
Will these filters fit Israeli gas masks?

Yes, they will, as both are 40mm NATO threaded.
How to properly clean the mask? How to properly dispose of a used filter? For both, in a case where you may fear you were in a contaminated area.

There are many cleaning products on the market for gas masks, and each is created for different purposes. As decontamination is a field of study on its own, we would suggest doing independent research and training before purchasing cleaning products. For viral threats, we have heard that Allegro 5003-U is a good product from industry experts. We do not sell it on our website, but you can find it in shops across the web. Filter disposal would depend on local laws for toxic waste disposal. Please check with local authorities as laws differ from county to county, state to state, and country to country.
Why are these masks not NIOSH approved? Is it primarily because of geographical usage?

Precisely. Traditionally, these masks were used by professionals in the EU, along with eastern-European countries. Both the CM-6M and CM-7M are EN 136 CL 3 (special purpose) certified. If you look through and compare NIOSH testing to EN, you will see that EN standards are just as stringent as their NIOSH counterparts. NIOSH does not determine quality by any means, just an extra piece of certification as mandated by OSHA for private sector professional use. Keep in mind, government-owned agencies are not subject to OSHA and can use non-NIOSH masks/filters. This includes police, fire brigades, first responders, etc. All of which are our customers in the US.
How long will a NBC-77 SOF filter protect in non-contaminated air against viruses?

As viruses travel in particles and liquid aerosols, this filter will protect you for as long as you can wear the mask (several days). Keep in mind; if you are in a contaminated environment, you would need to decontaminate properly before removing your protective gear, and then dispose of the filter as there is no way to regenerate it. Once the filter is used in a contaminated environment, it is considered toxic waste.

NBC-77 SOF® 40mm NATO Filter For Gas Masks - CBRN Filter, 20 Year Shelf Life

NBC-77 SOF® CBRN Gas Mask Filter

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