What is the "filtration rate (cutting rate)" of non -woven mask? Confirmation method

Non -woven fabric masks may look the same, but there are actually many types, and the performance is different depending on the type.

First, the indicator of the left and right masks is "filtering rate". The filtration rate means how large the particles can be cut to the extent to how much the filter part of the mold can be cut to the extent. It is also called "cutting rate".

Bacteria, viruses, pollen, PM2.5, saliva, etc. There are many particles that want to close with a mask, but the size of the particles is different. The smallest is the virus with a size of about 0.1 to 0.5 μm. The bacteria are 1.0 μm, the droplets are 3.0 to 5.0 μm, and the pollen is 30.0 μm, and the average size. The size of the PM2.5 that becomes a problem in air pollution is defined as a particle below 2.5 μm.

The performance of the mask is considered high and can capture smaller particles at a high rate. In order to evaluate the filtering performance of this mask, the general products will be checked as follows.

BFE: bacterial filtration efficiency

Show particles with bacteria with a size of about 3.0 μm. In other words, if it is marked as "BFE99%", a particle of 3.0 μm can be cut at a probability of 99%. The effect of preventing infection caused by bacteria and pollen disease is very good.

PFE: particle filtration efficiency

It means what can be cut about about 0.1 μm of particles. The higher the PFE, the small pathogens such as the influenza virus and other particles can be cut off well.

VFE: Virus filtration efficiency

It means what can be cut about 1.7 μm of particles. It shows the blocking effect of general viruses and viruses containing viruses.

It can be considered that the smaller the particles that can be filtered, the higher the filtration rate, the better the performance.

But good performance is not necessarily proportional to the price of the mask. The price of masks is easily affected by origin and brand, and the cost of circulation will increase, so even if PFE is low, there are high prices, and PFE is high and cheap. Can't just judge based on the price of the mask. It is important to confirm the display.

In addition, the mask has a variety of uses, which can be selected according to the particles you want to cut. The size of the new type of coronary virus is about 0.1 μm. However, the new coronary virus is now considered to be expanded due to "droplet infection", so the "VFE" that chooses to cut off the droplets is the focus.

On the other hand, the new coronary virus also caused infection due to air -soluble (particles floating in the air). The size of the gas solution is also smaller than the droplet. If possible, it is better to choose a "PFE" high -rate mask.

In addition, the general home mask is divided into three types: "pollen countermeasures", "cold, virus countermeasures", "PM2.5 countermeasures". Among them, the product marked as "PM2.5 countermeasures" confirmed a certain value through the PFE test. For those who are not clearly tested by the test results, please select "PM2.5 countermeasures".

Because the "cold · virus countermeasures" mask is a mask that is only used by BFE and VFE tests, and the condition of gas solution cannot be sufficient to prevent the effect. Of course, even the mask of "cold and virus countermeasures" can prevent the possibility of preventing infection from becoming higher, but if there is "PM2.5 countermeasures", it is recommended to choose there.