![]() ![]() ![]() Inorganic gases and vapours such as chlorine, hydrogen sulphide or hydrocyanic acid) ![]() Gases and vapours of organic compounds with a boiling point below 65☌ such as methanol, chloroform or perchloroethylene Organic gases and vapours (solvents) with boiling points above 65☌ such as white spirit, styrene or xylene In addition to the three efficiency levels, there is a specific codification composed by letters and colors for different types of toxic gas and substances. These gas mask filters feature a microporous structure made of active carbon with tiny capillaries for an enhanced purifying efficiency while reducing the breathing effort.Īs for particle filters, they are gathered into 3 efficiency classes, ensuring a purifying level (3 being the maximum protection level). Gas filters for APR respirators are especially designed to get protected against toxic substances. This breathing disturbance will determine the replacement. In a dusty environment, particulates filter will progressively clog and offer a higher and higher breathing resistance – without affecting the purifying power. Because of their hydrophobic characteristic they are water resistant and stop the thinnest particles. Particle filters for air purifying respirators (PAPR) feature a large parallel pleated purifying surface which avoid clogging risks in very dusty environments. The most effective protection is class P3 (filtration rate of 99.97%), which should be used as often as possible against tiny dust such as asbestos (level 1), ceramic fibres, and viruses (avian flu, H1N1 flu, coronavirus, etc.) and bacteria. They are gathered into 3 efficiency classes (P1, P2 or P3) that ensure a purifying level from 80% to 99.97%. Particle respiratory protection filters – also known as aerosol gas mask filters – are mainly used to protect users against dusts, particles, liquid and solid aerosols according to the EN143 standard. Another report claims that the 51M filters with the red stripe on the side are for training, but this is also not true, the filters with red stripe are just early ones.Sort By Set Descending Direction P3 respiratory protection filters (against dust) It is also very unlikely that there is an activated carbon and a separated carbonized plum and apricot pits layer because the later one is basically activated carbon (in the 41M filter the activated carbon was made of carbonized plum and apricot pits). It states the filter ineffective because of the spring inside, however, the problem of the jarred out spring is very uncommon. It mentions that the filter name is unknown, this is due to that the Hungarian filters always called the same as the mask to what it was issued and this can trick foreigners. The batch or serial number is printed on the side no on the bottom however the MEO stamp is still there.ĬIA report containing information about the 51M filter. The bottom plate is also strengthened to endure the pressure by the spring and the sealing cap on the thread is the new Soviet type, however it still sports a cardboard disc instead of rubber. So the inside is fully filled and a big spring holds together the inside components. Later 51M filters are nearly the same as the normal MO-2 filters. These filters were intended only for the civil defence and trainings. ![]() The early 51M filters were filled with the same substances as the 41M filter, because of this the filler mass in not fully fill out the space in the filter, these components are held together just by the sieves fixed with the outside grooves on the filter and interestingly these filters have the same cap sealing the 40mm connection as the 41M filters. The filter come in a dark-olive coloured flat steel canister with a threaded cap and a rubber plug on the bottom which is fixed to the canister with a string. ![]()
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