Introduction To Filter Grade

Pharma filters are essential in clean room projects and can be installed in any equipment used for air filtration, such as FFU, air conditioning filtration system, fume hood, biosafety cabinet, isolator, clean bench, weighing room, etc. With today's article, let's introduce the classification and function of filters in detail.

Filters can be simply divided into primary filters, medium efficiency filters and high efficiency particulate air filter.

As the name suggests, primary filters are filters used for primary filtration functions. It is mainly used to filter large particles in the air above 5μm or dust, hair, mosquitoes, etc. that can be distinguished by the naked eye. The filtration area of primary filters is generally large, which can not only ensure the smooth passage of fresh air, but also achieve a good filtration effect. Primary filters can be divided into plate filters, bag filters, and sometimes folding filters.

There are many types of medium efficiency filters, including G4, F5, F6, F7, F8, and F9. They are mainly used for intermediate filtration in ventilation and purification systems. In addition, medium efficiency filters are usually used as pre-filters for high-efficiency filters, filter part of dust through medium efficiency filters, reduce the filtering pressure of high-efficiency filters, and extend the service life of high-efficiency filters.Medium efficiency filters are used to filter dust and suspended matter of 1-10um in the air. The filtering efficiency is roughly between 60% and 95% depending on the level of the filter. The materials of the filter are mainly organic fibers, glass fibers, and non-woven fabrics. The process is stable, the risk of breakage is very small, and it can be reused after cleaning, which greatly reduces the consumption of funds.

High efficiency filter is the highest level of filter, used to filter tiny dust particles larger than 0.3um. As the terminal filter in the filtration system, high efficiency filter has many types of frame and filter media. The frame can be made of aluminum profile, stainless steel plate, galvanized steel plate, which is light and easy to install and replace. It is acid-resistant and corrosion-resistant, suitable for chemical laboratories, and pharmaceutical factories. The material is economical and durable, suitable for most companies. The filter part usually uses ultra-fine glass fiber, which has been tested in the market and is the most efficient.

No matter what kind of filter you use, it cannot be used forever and needs to be replaced regularly. The recommended replacement time is 3-6 months, which also needs to be considered based on the actual usage environment.