Simple Interpretation of National Standard KP and KN for Masks

Release time:

2018-07-30

The national standard (GB2626-2006 "respiratory protective equipment self-priming filter anti-particulate respirator") divides dust masks into KN and KP categories, KN represents non-oily particles (applicable to dust protection),KP represents oily and non-oily particles. KN class is divided into KN90, KN95, KN100 three levels, in general, the higher the level, the better the protection efficiency. Among them, KN100 dust mask can be more than 0.075 microns of dust, smoke, fog, microorganisms and other non-oily particles of the protective effect can reach more than 99.97. It can be seen that KN100 dust mask is more reassuring for the prevention of pneumoconiosis.

Laboratory testing used NaCl particles to simulate non-oily particles with a mass median diameter of 0.6 microns, and paraffin oil to simulate oily particles with a mass median diameter of 0.3 microns. The detected ventilation is constant85±1L/m.

What kind of environment are these masks suitable?

Through the above analysis, we can understand that this KNKP is mainly a dust mask, so it is suitable for dust-rich environments or masks worn for dust-proof purposes. For example, the dusty working environment, coal miners, cement workers, etc., or in daily life in order to prevent smog.

What grade do you choose?

If it is daily anti-smog, the difference between which grade to choose will not be particularly large, because the dust in the airhazeThe concentration is also light relative to those workers in extreme working environments. The higher the level of selection, the better.

But how do cement workers choose? First of all, they must choose the highest grade.KN100, in addition to other requirements? Of course, there is an important data is respiratory resistance. Breathing resistance should not be too high. If it is too high to cause unsmooth breathing, then this mask will not work.There are requirements for respiratory resistance in the national standard: the total inspiratory resistance is not more than 350Pa and the total expiratory resistance is not more than 250Pa.So when wearing can make people breathe smoothlyMasksIt is suitable for long-term occupational protection.

Discarded dust masks (such as disposable masks) are not suitable for long-term occupational protection due to their high air leakage rate, and full-face masks are extremely inconvenient to wear. However, compared with the low air leakage rate, the double half-mask type dust mask, which is relatively convenient to wear, is undoubtedly welcomed by everyone. Moreover, in comparison, the service life of the double half mask type dust mask is relatively longer, and the comprehensive protection cost is also lower.

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