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What do the BFE99 and PFE99 in the mask test mean

What do the BFE99 and PFE99 in the mask test mean

(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

(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.

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.

Keyword:

How

How the Melt-blown fabric is constructed

The following paragraph of this article will introduce the related production process of Melt-blown fabric. The production process of Melt-blown fabric is mainly divided into three steps: melt extrusion, melt-blown process, and electret treatment. Specifically, Melt-blown fabric uses high-speed hot air flow to draw the extruded polymer melt through the spinneret holes of the die nozzle. From this, microfibers are formed and collected on a condensate screen or drum, and at the same time self-bond to become a Melt-blown fabric.
2023-03-23
Reasons

Reasons why Melt-blown fabric becomes brittle after production

1. If the aspect ratio of the spinneret of Melt-blown fabric is small, the holes are thick and short. After the polymer is sprayed, the fibers are thicker, the gaps are larger, and the water absorption is stronger for a long time , so the Melt-blown fabric is neither soft nor brittle.
2023-03-16
The

The features of BFE 99 masks

BFE in BFE 99 masks means bacterial filtration effect, which refers to the material's resistance to bacterial penetration. The reported results of BFE 99 masks are shown in percentage data, corresponding to the ability of the material to resist bacterial penetration. The higher the value, the better its filtration performance. 
2023-03-09
Chemical

Chemical absorbent pads manufacturers take you to understand absorbent pads

Chemical absorbent pads manufacturers tell you that as we all know, with the rapid development of the modern industrial chain, absorbent pads have been widely used in fresh vegetables and fruits. In the next paragraph of this article, chemical absorbent pads manufacturers will show you how the small absorbent pads are well known to everyone.
2023-03-02

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