How should the HEPA filter be selected?
HEPA filter rating
HEPA filters are classified according to the level of filtration capacity and are generally classified into G1 to H14 and other grades.
For fine particles with a diameter of 0.3 microns or more, G1-F5 does not have any filtering effect, and the filtration efficiency of F6-H14 is from 20% to 99.999997%.
F6-F8 is called medium efficiency air filter;
F9-H11 is called a sub-high efficiency filter;
H12-H13 is called a high-efficiency air filter.
H14 is called an ultra-efficient air filter.
Main components of the HEPA filter
PP type HEPA filter (polypropylene, a semi-crystalline thermoplastic)
PET type HEPA filter (material for disposable plastic products)
PP and PET composite HEPA filter
Glass fiber ultra-efficient HEPA filter (an inorganic non-metallic material with excellent performance)
PP and glass fiber HEPA filters are generally not washable. Filters based on PET or containing PET have a certain degree of water washability.
However, Xiaobian has to remind everyone: PET-based HEPA is made by melt-spraying materials such as polyester resin. Due to the worst filtration effect, it is generally applied to household appliances such as vacuum cleaners and sweeping robots that do not require high filtration accuracy. Or a large cleaning machine.
What are the advantages and disadvantages of PP, PP, and PP composite HEPA?
PP type HEPA
The PP filter element is made by hot melt entanglement of ultrafine polypropylene fibers. It is the same material as the first primary filter material meltblown PP cotton in the general water purifier, but the shape is changed. In appearance, the PP-based HEPA filter is similar to the ultra-efficient fiberglass HEPA filter. Many people in the industry can’t distinguish between the two by their appearance. When PP type HEPA is used in air purifiers, the purification efficiency is not high, up to H10 level, and it can only achieve high efficiency or sub-efficiency, which is far from the ultra-efficient filtration level.
PP composite HEPA (PP and PET)
Currently, PP type HEPA filtration on the market is inefficient and cannot meet the needs of consumers. In order to expand the market, some manufacturers process PP-type HEPA filters, so there is a PP composite HEPA filter.
PP composite HEPA actually melts a layer of PP and then melts a layer of PET so that it combines PP and PET. In fact, its main material is still PP type HEPA. After treatment, a composite electrostatic layer is formed on the surface of the PP material to form an electrostatic film. The electrostatic film generates static electricity on the HEPA, and the pollutants passing through the filter are electrostatically adsorbed. Improve the efficiency of single filter filtration.
After about 3 months, after the electrostatic layer is blown by the fan and consumed, the filtration effect of the composite filter will be greatly reduced. In the long-term use, you need to pay attention to the filter consumption and replace the filter element in time.
* Glass fiber ultra-efficient HEPA
Glass fiber is also referred to as glass fiber. The filtration precision of glass fiber HEPA is very high, and the filtration grade reaches H14. Therefore, its cost is about 3 times higher than that of the PP type HEPA filter.
Glass fiber materials are quite obvious compared to PP materials:
#Strong durability: high mechanical strength, strong wear resistance, improve the durability of the filter;
#High dust holding capacity: The filter material made of glass fiber has good elasticity, and its dust-holding capacity is often doubled compared with other chemical fiber filter materials;
The glass fiber HEPA filter has the highest filtration efficiency in all materials. The HEPA filter made of glass fiber is several times more efficient than ordinary filter media.
Glass fiber materials are widely used in the fields of biopharmaceuticals, dust-free and sterile laboratories for medical systems, operating rooms, electronic semiconductors, food and beverage industrial clean rooms, and other professional environmental pollution control.
When choosing the HPEA filter element, you can refer to the above and make the corresponding choice to find the purifier for HEPA filter element suitable for your home use. The purification effect will be obvious.
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