Matters needing attention when choosing activated carbon filter

1. Look at the ingredients: It is good if the granular coconut shell activated carbon with a size of 0.42~0.85mm is good, because the two national standards for indoor air quality GB50325 and GB/T18883 have clearly stipulated, for example: the national standard of the People's Republic of China GB/T Appendix B3.1 of the 18883-2002 Air Quality Standard stipulates that the test method for benzene in indoor air is the test tube sampling method, that is, the benzene in the indoor air is sampled and then taken back to the laboratory for analysis. It is clearly stipulated to be eaten: coconut shell activated carbon: 20-40 mesh (0.42mm~0.85mm size). It is used to install activated carbon sampling tubes. , and then take it back to the laboratory, and use carbon disulfide to re-analyze the benzene adsorbed in the coconut shell activated carbon for laboratory analysis. Please note that the standard clearly stipulates that it is coconut shell activated carbon, and it is 20-40 mesh, which is 0.42-0.85mm in particle size. 2. Second, look at the pore size and components: Everyone knows that the activated carbon filter element absorbs harmful gases by the size of the pore size. Obviously, different harmful substances have different molecular weights and different particle sizes, so the pore size of activated carbon that adsorbs different harmful gases must also be different. They will not be the same. Generally speaking, the activated carbon that adsorbs different gases is also different in appearance. At present, indoor pollution is mainly formaldehyde, benzene, TVOC, etc., so professional activated carbon manufacturers will use more than 2 kinds of different types of activated carbon. The effect is good. 3. Three look at the particle size: The particles should not exceed 1.5mm or more: the national standard stipulates that the particles of activated carbon should be 20-40 mesh, which means that the particles are about 0.42~0.85mm, and those with particles above 1.5mm The effect is Activated carbon with no small particles works well. Generally speaking, the smaller the particle size of activated carbon, the larger the specific surface area, that is, the better the adsorption effect. However, the smaller the particle size, the greater the loss and the larger the dust. Therefore, many manufacturers use larger particles in order to reduce costs. Activated carbon, of course, the effect is not good. Even with such large particles of activated carbon, there is still a lot of dust. You can see the quality of it at a glance. 4. Looking at the dust, the first principle of using activated carbon is not to contaminate the items, and not to harm the human body, so the production of activated carbon must be post-processing, that is, to remove dust from crushed coconut shells, otherwise the dust will be too much, clean The temperature is very poor, and it will be very dirty when you hold the activated carbon pocket in your hand. The result is that if you inhale it, it will be harmful to the human body, and the surrounding items will be soiled. Good activated carbon, not only has small particles, but also has no Ash, even if it is used for a long time, the packaging bag will turn black but there will be no ash, just like no matter how small the sand grains are, there will be no ash, and no matter how large the clods are, there will still be ash. The activated carbon itself is black, like a pencil will dye. , It is normal to dye the pocket black for a long time, but there should be no ash leakage. 5. Look at the size of the carbon bag: Activated carbon passively adsorbs harmful gases, so the effect must be dispersed in small bags. Generally, they are made into small bags of 30~60g/bag. Those large bags of several hundred grams cannot be used. Scattered, of course, the use effect is not good.

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