Testing method of high efficiency filter

The high efficiency filter is mainly used to trap the particle dust below 0.5um and various suspended matters, as the end filtration of various filtration systems. It adopts ultra-fine glass fiber paper as filter material, glueboard paper, aluminum foil board and other materials folded as dividing board, sealed by new type of polyurethane sealant, and made of galvanized plate, stainless steel plate and aluminum alloy profile as outer frame.

Each unit ofSFFILTECH is tested by nano-flame method, featuring high filtration efficiency, low resistance and large dust capacity. Thehigh efficiency air filter can be widely used in the air conditioning end of the clean room in the industries of optical electronics, LCD liquid crystal manufacturing, biological medicine, precision instruments, beverage and food, PCB printing, etc. Both high efficiency and ultra-high efficiency filters are used in the end of clean room, which can be divided into the following structural forms: high efficiency filter with partition, high efficiency filter without partition and ultra-high efficiency filter.

In addition, there are three kinds of high efficiency filters, one is super high efficiency filter, which can do 99.9995% purification. One is antibacterial type high efficiency air filter without partition, with antibacterial effect, prevent bacteria from entering the clean room, a kind of sub-high efficiency filter, the price is cheap before more used in the purification space with low requirements.

High-efficiency filter leak detection.

The instruments commonly used for high efficiency filter leak detection are: dust particle counter and 5C aerosol generator.

Dust particle counter

It is used to measure the size and number of dust particles per unit volume of air in clean environments, and can directly detect clean environments with cleanliness levels from ten to 300,000. Small size, light weight, high detection accuracy, simple operation, microprocessor control, storage, printing measurement results, testing clean environment is very convenient.

5C aerosol generator

The TDA-5C aerosol generator can produce consistent aerosol particles of multiple diameter distributions. The TDA-5C aerosol generator can provide enough challenging particles to measure high efficiency filtration systems when used with aerosol photometers such as the TDA-2G or TDA-2H.

Leak detection method for high efficiency filters

HEPA filter leak testing is basically a process of applying challenge particles upstream of the HEPA filter and then searching for leaks with a particle detection instrument on the surface and frame of the HEPA filter. There are several different methods of leak testing that can be used in different situations.

Aerosol photometry.

For some time now, DOS, also known as DEHS and PAO, has been used instead of DOP because of its suspected carcinogenic effect on humans, but the test method is still called the "DOP method".

FDA pointed out that in leak detection, the choice of aerosols should meet certain physical and chemical requirements, should not use aerosols that can cause microbial contamination, causing microbial growth. At present, more hot DOPs are commonly used, so the efficiency of the filter should be guaranteed.

Test instrument.

SFFILTECH reminds you that the test instruments can be divided into aerosol photometer and particle generator. There are two types of display versions of aerogel photometer, analog and digital, which must be calibrated once a year. There are two types of particulate generators, one is the ordinary particulate generator, which only requires high pressure air, and the other is the heated particulate generator, which requires high pressure air and power, and the particulate generator does not require calibration.