When we buy air purifiers and fresh air systems, we always hear merchants mention the word “HEPA filter”. Many people may not understand this word. What does it mean? Below, the polytetrafluoroethylene plate and frame filter membrane manufacturer will take you to understand it.
HEPA (High efficiency particulate air Filter), Chinese means high-efficiency air filter, HEPA filter has a diameter of 0.3 microns (hair The removal efficiency of particles larger than 1/200 of the diameter can reach over 99.97%, making it the most effective filtering medium for smoke, dust, bacteria and other pollutants. There are many kinds of materials that make up HEPA, which can be divided into PP (polypropylene) high-efficiency filter paper, PET filter paper, PP and PET composite high-efficiency filter paper, and glass fiber high-efficiency filter paper. Among them, PP (polypropylene) is paper, so it generally cannot be washed. Another part of the HEPA filter is made of PET or PTFE polytetrafluoroethylene plate and frame filter membrane. This is the origin of many claims on the Internet that the HEPA filter is washable. However, here the editor must remind you of the efficiency of PET. Very low.
I always hear people say, “The filtration level of the filter I use is H12.” So what is the “H12” criterion here? According to the EU EN1882 standard, we divide HEPAl filters into 5 levels according to the filtration efficiency: coarse filter, medium filter, sub-high efficiency filter, HEPA filter and ultra-high efficiency filter. A filter with a filtration efficiency higher than 99.9% for 0.3μm particles is called H12.
The purification principle of the HEPA filter is not simply to purify the air by filtering out particles larger than the mesh like a sieve. Instead, it relies on the van der Waals force between fine particles and the filter to form an adsorption effect. It has a very good filtration efficiency for particles above 0.5 μm and below 0.1 μm. Particles below 0.1 μm undergo Brownian motion. The smaller the particle, the stronger the Brownian motion, the more times it is hit, and the better the adsorption effect. Particles above 0.5μm move inertially. The greater the mass, the greater the inertia and the better the filtration effect. In comparison, particles with a diameter of 0.1-0.3μm have become difficult to remove by HEPA. This is why the industry defines HEPA filter levels by filtering 0.3μm particulate matter.
The polytetrafluoroethylene plate and frame filter membrane is obtained by thermally compounding the self-developed high-efficiency PTFE microporous film and imported non-woven fabric. , has a reliable filtration level of H11-H14, low wind resistance and low energy consumption. It can be widely used in household vacuum cleaners and other fields. It is easy to clean and has high filtration efficiency. Interested parties can enter the store for consultation and purchase!
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