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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.

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A brief introduction to a spill kit

The material of the spill kit is 100% polypropylene, odorless and non-toxic, heat bearing, heat-resisting, and anti-corrosion. The capacity of oil/liquid absorbent power of spill kit material is 10~20 times the weight of the product itself. The material of the spill kit is Products of natural environment protection.
2022-12-01
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A Brief Introduction to Household Cleaning Wipes

There are a variety of household cleaning wipes that are perfect for cleaning and destroying powerful bacteria. Antibacterial wipes are currently the leading product involved in household cleaning supply purchases. They are the easiest products to use in terms of being disposable and spotless. It's also crucial for family homes to use cleaning products to keep the house clean.
2022-11-24
2022

2022 HIGH-TECH EXPO, Juneng Group to show new products

On November 16, 2022, the 10th HIGH-TECH EXPO will be held in Mianyang, Sichuan. With the theme of "Science and technology leading, innovation and entrepreneurship, cooperation and sharing", the confe
2022-11-23
Features

Features of the use of Household Cleaning Wipes

Household cleaning wipes are safe to use if you follow the unique directions on the package of household cleaning wipes. Proper use of household cleaning wipes can properly eliminate germs in your home.
2022-11-17

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