How to determine the quality of activated carbon in the filter element 1. Look at the composition: If the granular coconut shell activated carbon of 0.42~0.85mm size is good, because the national standards for indoor air quality are clearly defined in GB50325 and GB/T18883, for example: The national standard GB/T 18883-2002 air quality standard appendix B3.1 stipulates that the test method for benzene in indoor air uses the test tube sampling method, that is, the benzene in the indoor air is sampled and then taken back to the laboratory for analysis. The benzene sampling tube specification standard clearly stipulates that it should be eaten: “Coconut shell activated carbon: 20-40 mesh (0.42mm~0.85mm size). It is used to install activated carbon sampling tube.â€, then take it back to the laboratory and use carbon disulfide. The benzene adsorbed in the coconut shell activated carbon was further analyzed for laboratory analysis. Please note that the standard specifies that it is coconut shell activated carbon, and it is 20 to 40 mesh, which is 0.42 to 0.85 mm in terms of particle size. Counterfeit products: the first type: cylindrical coal-like activated carbon; the second type: powdered coal-like activated carbon; the third type: granular bamboo charcoal; the fourth type: granular shell-shell charcoal, in which the general particles are large, many are not Coconut shell charcoal, but other shell charcoal, generally manufacturers of coconut shell activated carbon are in the south, the north is not growing coconut. These types of products are general activated carbons that are eaten industrially, and are used to adsorb indoor decoration pollution, and the effect is very poor. 2, look at the aperture, components: we know that activated carbon is based on the size of the pores to absorb harmful gases, it is obvious, different harmful other molecular weights, the size of the particles are different, then the pore size of activated carbon adsorption of different harmful gases must not Will be the same, generally from the appearance point of view, the adsorption of different gases of activated carbon is not the same, the current indoor pollution is mainly formaldehyde, benzene, TVOC, etc., so professional activated carbon manufacturers will use more than two kinds of different types of activated carbon mixed production, such effect It’s good. 3, three look at the particle size: the particles can not exceed 1.5mm: the national standard specifies that the activated carbon particles should be 20-40 mesh, the conversion is the particles in the 0.42 ~ 0.85mm, those particles in the 1.5mm or more activated carbon, the effect is The activated carbon without small particles works well. Generally speaking, the smaller the particle size, the larger the specific surface area, that is, the better the adsorption effect, but the smaller the particle, the larger the loss and the larger the dust, so many manufacturers use large particles in order to reduce costs. Activated carbon, of course, the effect is not good, it is such a large particle of activated carbon, some dust is still very much, good or bad can be seen at a glance. 4, four look at the dust, that is, the post-treatment of activated carbon: the first principle of using activated carbon is not to stain the goods, can not harm the human body, so the production of activated carbon, must be post-treatment, that is, the crushed coconut shell to remove dust, Otherwise, the dust is too much, the cleanliness is very poor, and it will be dirty on the activated carbon pocket. The result is that if inhaled, it will be harmful to the human body, and then the surrounding items will be stained. In order to reduce the cost, there is no post-treatment of the activated carbon ash. Their activated carbon may have large particles, but the dust is larger. As a result, the packaging pocket will stain the hands by hand, and will stain the cabinet and the surrounding area when used. Items, and good activated carbon, not only the particles are small, there is no ash, even if used for a long time, the bag will turn black but there will be no ash, just like the sand is small and there is no ash, the clods will still be big Gray, the activated carbon itself is black, like a pencil will stain, it is normal to dye the pocket black for a long time, but there is no ash leakage. For those activated carbon with large dust, it is recommended not to buy, otherwise the trouble can only be your own, the dust of activated carbon is dirty, but it is not easy to clean, and the dusty activated carbon magazine is bound to be more, which is easy to cause other hazards. 5, five look at the enterprise: must be specialized in the production of activated carbon enterprises, the purchase of activated carbon, we must see where the production of activated carbon, only the production of activated carbon produced by the company is the quality of the production, and direct manufacturers The cost will not be too high, the price is good, the inferior activated carbon on the market can be seen, their production companies, without exception, are trading companies, basically just where to find some activated carbon packaging to sell out, The quality can be imagined, and the activated carbon that has been used or not has no effect, and it is not known. 6, six look packaging: professional home use activated carbon will be divided into a number of small charcoal bags, directly in the cabinet, inside the drawer can be, we all know that once activated carbon will contact the air will be invalid, so the formal activated carbon packaging, must It is sealed. If it is packed in a plastic bag, it must be sealed. It cannot be sealed with a self-sealing bag or a bread that is sealed together. Because these are not sealed, it will not be known for a long time. The effect is of course not good. If it is a carton package, then there must be a heat shrink film outside the carton package. Some manufacturers use the carton package directly, and a ziplock bag inside, the result is still not sealed. 7. Look at the size of the charcoal bag: Activated carbon is passively adsorbing harmful gas, so it is necessary to disperse the effect of the small bag. Generally, it is made into a small bag of 30~60g/bag. Those bags with a bag of several hundred grams cannot be used. Decentralized placement, of course, the effect is not good. 8. Why can't you buy bamboo charcoal: You must know that activated carbon is a very professional chemical category. To produce activated carbon, you must have professional instruments and equipment. The investment is more than several million, and the bamboo charcoal manufacturers rely on the development of franchisees. To make money, they are not activated carbon manufacturers at all. The bamboo charcoal produced has not been activated at all. Therefore, bamboo charcoal simply does not dare to call activated carbon.
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