What exactly is high-efficiency filter PAO testing?

PAO refers to the particle counter (Particle Aerosol Oil) detection method, also known as the particle counting method. It is one of the methods specified in the ISO 29463/1 standard and the European standard EN 1822-1. It uses a special particle solution to spray a certain concentration of particles on the tested high-efficiency filter under standard temperature and humidity conditions and evaluates its performance by measuring the filtration efficiency of half-micron particles in the high-efficiency filter.

After spraying the PAO solution, the high-efficiency filter will collect a certain number of dyed particles. The inspector uses a particle counter to measure the particle concentration and compare the results with the specifications of the filter. In this way, it can be judged whether the filtration efficiency of the filter meets the expected requirements. Normally, PAO testing standards require that the filter's filtration efficiency reaches a certain percentage within the specified particle diameter range. For example, an efficiency of 99.97% can filter particles with a diameter of 0.3 microns.

PAO testing of high-efficiency air filters can ensure that the filter performance meets national and industry requirements. This is very important for industries that require high-purity air environments, such as operating rooms, pharmaceutical factories, and laboratories. In addition, Pao detection can also be used to monitor performance changes of HEPA filters so that filters can be replaced or maintained promptly. In addition to PAO testing, high-efficiency air filters also need to undergo other quality testing, such as pressure drop testing, dimensional testing, etc. These tests provide a comprehensive assessment of the filter's performance to ensure its effectiveness in actual use.

In summary, PAO testing of high-efficiency filters is an important quality testing method that can evaluate the filtration efficiency of the filter to ensure that it can meet the expected filtration requirements and comply with relevant standards in use. Through this test, all walks of life can obtain a clean air environment, improve production efficiency and product quality, and protect personnel health.