The Common Material and Grade Division of HEPA Filter Net

The common material of HEPA filter

What are the common materials of HEPA filter? There are many kinds of materials that make up HEPA, which can be divided into PP(polypropylene) filter paper, PET filter paper, PP and PET composite filter paper and glass fiber filter paper. PP(polypropylene) is paper, so generally can not be washed.

Another part of the HEPA filter using PET or PTFE material, which is the origin of many claims on the Internet washing HEPA filter, but here to remind you that the efficiency of PET is very low. PP(polypropylene) filter paper; It is a new filter material made of polypropylene by special hot melt method. The product has acid and alkali resistance, corrosion resistance, high melting point, stable performance, tasteless, uniform distribution, with relatively low resistance, high efficiency, high strength and so on.

PET filter paper: It is made of polyester resin and other materials with high hardness, good stiffness, corrosion resistance, high temperature resistance and stable performance. It is commonly used in sweeper, vacuum cleaner and other household appliances with low filtration accuracy requirements or large cleaning machines.

Composite filter paper (PP and PET): composite filter paper, simply said is a layer of PP melt-spray, and then a layer of PET melt-spray, so that he integrates the advantages of PP and PET: easy to form, filtration accuracy can reach; Both stiffness and high precision filtering effect can be achieved.

Glass fiber filter paper: Glass fiber filter paper, is a very high gold content filter paper, has been used in the nuclear industry.

Common classification of HEPA levels

Air filters are divided into G1-G4, F5-F9, H10-H14 and U15-U17 according to the current European grade. H grade is common in air purifiers. This specification belongs to high efficiency or sub-high efficiency filter net. The H13 filter paper can achieve a total efficiency of 99.95%. The total efficiency of HEPA filter paper with grade H14 can reach 99.995%.

Of course, in the European standard, the high purification grade of HEPA filter is U grade, among which the total purification efficiency of U17 grade HEPA filter can even reach 99.99999%. However, because the production cost of U-grade HEPA filter is high, and the production environment requirements are very harsh. So there’s not a lot that can be used on the market.