Recently, many people have begun to pay attention to the specifications on the masks, so simply write the common signs BFE, PFE, VFE
BFE is Bacterial Filtration Efficiency, which measures the efficiency of masks to filter bacteria.
PFE is Particulate Filtration Efficiency, which measures the efficiency of mask filtering particles.
VFE is Viral Filtration Efficiency, which measures the efficiency of masks in filtering viruses.
The BFE measurement method is the ability of the mask to filter microbial particles from the inside. Most of this test will be performed with particles of about 3.0 μm (micrometers) and a flow rate of 28.3 lpm (liters/minute).
The meaning of the so-called "N95" is the dust masks certified by the United States NIOSH N95, for 0. The filtering effect of 3μm (micron) non-oily suspended particles reaches 95%. In addition to referring to the specifications of American industrial dust masks, you can also refer to the similar regulations and standards of the European Union and Japan as a reference for purchasing masks.
EU product classifications are FFP1, FFP2, FFP3, Australia classifications are P 1, P 2, P 3 Japan classifications are DS 1, DS 2, DS 3, etc. The standards are similar to American standards, so when choosing these levels of dust masks It can also achieve the similar effect of N 9 5 mask.
Some biotechnology companies have developed and woven bioceramic powder on cotton cloth to make masks. Since the powder has reached nano-level micro-units, it can effectively prevent bacterial invasion.
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Susan F.//SMC Editor