COLOR CODES AND FILTERS

The gas mask you choose will only protect you with a suitable filter. Whether it's only against dust particles or serious threats such as chemical weapons. The table below will shed some light on the differences of various filters and their markings.

COLOR CODING

If we take the NBC-3/SL filter as an example, which is A2B2E2K2HgP3 D R SX - The code means that it protects against gases and vapors with a boiling point greater than 65 degrees (C), inorganic gases and vapors, sulphur dioxide and hydrogen chloride, ammonia and organic ammonia derivatives, and radioactive particles, as well as dolomite particles and other harmful materials. With the exception of NO and CO gases. The numbers “2” or “3” present next to each letter code indicates what class of filtration is provided:

Class 1 filters - 1,000 parts per million (PPM)

Class 2 filters - up to 5,000 PPM

Class 3 filters - up to 10,000 PM

Other acronyms will indicate what kinds of agents the filter will block. For example, a filter described with an (as in our case) “NBC” rating means it protects against nuclear, biological, and chemical agents. A filter rated with a “CBA-RCA” rating means it protects against chemical, biological, and riot-control agents, but not nuclear.

FILTER/GAS MASKS THREADS

There is some standardization in the threads and fittings used to pair filters with their respirators and gas masks. The most common threading is the 40mm NATO Standard (Rd 40 x 1/7”), and this is typical for most filters on the market. There are also Russian/Soviet masks that use threading according to the GOST standard and also civilian work safety masks that use other types of filter mounts such as bayonet, etc. Masks and filters will only fit each other if they follow the same standard, e.g. a GOST threaded filter will NOT fit a STANAG threaded mask.

GAS MASK CLASSES

Gas masks typically come in three classes according to EN 136 standardization.

Class 1 mask - typical work safety mask that uses bayonet or other types of mounting solutions, but will never use an RD40 thread.

Class 2 mask - with an RD40 thread rated (perfect and not overly complicated for civilian defense) and protection is rated as high as the filter mounted

Class 3 mask - with higher requirements, e.g. fire resistance, etc. Also uses an RD40 thread, if using the same filter as class 2 - provides identical protection. Mostly used by fire brigades, law enforcement and other armed services.

SUMMARY

In order to protect your self from life threatening gases, we recommend picking a gas mask according to the EN 136 standard with an RD40 thread and a filter according to EN 14387 standard with an RD40 thread with, at the very least, the protection levels of A1B2E1K1P3. When purchasing the gas masks and filters observe that the markings for these standards and protection levels are clearly pointed out on the label. The packaging for the filters must not be damaged or torn and the shelf life for the filters remaining for at least 10 years.

FREQUENTLY ASKED QUESTIONS

1. What is the difference between Class 2 and Class 3 masks?

When using only with filters, the difference is negligible - protection levels are the same. Class 3 masks are rated for higher temperatures and can offer the ability to use PAPR and SCBA devices.

2. What is the benefit in having 2 filter openings versus 1?

When using a mask with 2 filters at the same time, the breathing resistance is lower - it is easier to breathe, this might be necessary for children or people with breathing difficulties.

3. Can I use filters and masks past their expiration dates?

Although it is recommended to cease using personal protective devices after their expiration date, if nothing else is available, a filter/gas mask past expiration date is better than nothing. Before usage, inspect the device, make sure it is not damaged, that it is airtight and that flow of air is still possible through the filter attached to the gas mask.

4. What gas mask should I choose?

This depends on what you are going to use it for? If strictly for civilian usage, any Class 2 mask will do fine. If you are planning on using the mask with a weapon, make sure to pick one which allows to comfortably shoulder the weapon and acquire the sights for optimal field of view.