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What do the BFE99 and PFE99 in the mask test mean

Categories:Melt-blown fabric News
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Time of issue:2021-11-29
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(Summary description)BFE99 often uses aerosol particles with an average particle diameter of 3 μm, while PFE99 generally uses sodium chloride particles with a diameter of 0.075 μm. Purely from the point of view of the filtering effect, PFE99 has a higher effect than BFE99.

What do the BFE99 and PFE99 in the mask test mean

Categories:Melt-blown fabric News
Author:
Origin:
Time of issue:2021-11-29
Views:

Information

The filter material of the mask is basically a meltblown non-woven fabric made of polypropylene material, and factors such as the pore size and thickness of the fiber affect the filtering effect. Particles of different diameters are filtered through different principles, such as particle volume, impact, and diffusion principles that result in being blocked by fibers, and some particles are filtered by electrostatic fibers through the principle of electrostatic attraction.

PFE99

The filtration efficiency test is carried out under the particle size specified in the standard, and different standards will use different sizes of particles for testing. BFE99 often uses aerosol particles with an average particle diameter of 3 μm, while PFE99 generally uses sodium chloride particles with a diameter of 0.075 μm. Purely from the point of view of the filtering effect, PFE99 has a higher effect than BFE99.

In the commonly heard standard test of KN95 masks, particles with an aerodynamic diameter of 0.3μm are used as the test object, because particles larger or smaller than this diameter are more likely to be intercepted by filter fibers, while particles with an intermediate size of 0.3μm It is more difficult to be filtered. Although the virus is small in size, it cannot be transmitted in the air alone. It needs droplets and droplet nuclei as carriers to be dispersed in the air, so it can be easily filtered out.

Particulate Filtration Efficiency PFE99 (Particulate Filtration Efficiency): The filtering effect of fine particles, the larger the value, the better the filtering effect.

Particle filtration efficiency BFE99 (Bacterial Filtration Efficiency): the filtration effect of particles, the larger the value, the better the filtration effect.

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