China National Standards GB6223-86UDC614.894

Release time:

2024-04-22

The above inspection standards are all tested with a particle size of 0.3 microns except the Japanese standard (0.06-0.1) microns. The detection flow rate of the EU standard is 95L/min, and the American standard is 85L/min. China's national standard with a suspended particle size of less than 5 microns of more than 90%, less than 2 microns of more than 70%, the flow value of 42.5L/min. In the testing and certification of filter materials, the idea of "worst case" is adopted, that is, the conditions for testing experiments in the laboratory are set up as the worst conditions. For example, the dust particle size of ammoniated sodium salt or DOP oil mist used in the efficiency experiment is the gas dynamics calculation diameter of 0.3 microns, which represents the size of the extremely fine particles that are most easy to penetrate the filter material and the respiratory capacity in strong manual labor. Before the experiment, the filter material should be pretreated with high temperature and high humidity, which represents the harsh working environment, the purpose of all this is to test that under such harsh conditions, if the filter material can be tested to achieve the corresponding efficiency level, then it will be more effective in protecting the health of workers in practical applications. Antivirus filter materials generally use activated carbon or chemically treated activated carbon as a material, through adsorption or chemical reaction to filter the gas or vapor without being inhaled. There are many micropores in the internal structure of activated carbon that can form a great specific surface area. These micropores can inhale toxic vapors and gas molecules of different molecular sizes without escaping. The handling and installation requirements of activated carbon are very high. If it is not handled properly or the activated carbon particles are very coarse, resulting in gaps between particles, the poisonous gas will penetrate into the respiratory tract from the gaps and will not be adsorbed. Therefore, the practice of replacing bagged activated carbon is very unscientific. The activated carbon in a good chemical filter box should be packed tightly, with small particle size and large specific surface area, so that the anti-virus time will be long, and at the same time, the respiratory resistance will be small and comfortable to wear.

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