Note - when activated carbon filter selection 【 3 m filter.

If 1, see the ingredients:

0. 42 ~ 0. 85 mm size granular coconut shell activated carbon, because the country about indoor air quality in the two standard GB50325 and GB/T18883 make clear a regulation, for example: the People's Republic of China national standard GB/T 18883 - 2002 air quality standard appendix B3. 1, benzene in indoor air testing method, using a test tube sampling method, namely the benzene in indoor air sampling and then back to the laboratory analysis, including benzene sampling tube specifications specified inside to eat: & other; Coconut shell activated carbon: 20 & ndash; 40 mesh ( 0. 42毫米~ 0。 85 mm size) 。 For activated carbon sample tube. ” And then back to the lab, the coconut shell activated carbon with carbon disulfide in adsorption of benzene and parse it out for laboratory analysis. Please note that the standard specified is coconut shell activated carbon, and it is 20 ~ 40 mesh, converted to particle size is zero. 42 ~ 0. 85mm。

2, 2 see aperture, components:

you know activated carbon filter is a harmful gas adsorption by the aperture size, so it is obvious that different harmful other molecular weight, the size of the particles is also different, so different harmful gas adsorption of activated carbon aperture will not necessarily the same, generally look from the exterior, different gases adsorption of activated carbon is also different, indoor pollution at present is mainly formaldehyde, benzene, TVOC, etc. , so the professional activated carbon manufacturers will use two or more different kinds of activated carbon hybrid production, this effect is good.

3, 3 look particle size:

particles cannot be more than 1. More than 5 mm, inside the standard provisions of the state of active carbon particles in 20 - 40 mesh, the conversion to particles in 0. 42 ~ 0. About 85 mm, the particles in 1. More than 5 mm of activated carbon, the effect is no small particles of activated carbon with good effect. In general, the smaller the particle activated carbon, the bigger the specific surface area, that is, the better adsorption effect, but the smaller particles, losses will be, the greater the dust will lead to greater, so a lot of manufacturers to reduce costs, the use of granular activated carbon, the effect is not, of course, this is big granular activated carbon, some of the dust is still very much, good or bad quality could tell at a glance.

4, four see dust,

the first principles of using activated carbon can't be soiled items, can not have a harm to human body, so the production of activated carbon, must the reprocessing, also is to crush the coconut shell and remove dust, otherwise too much dust, cleanliness is very poor, in his hand pockets on activated carbon was very dirty, the result is that if inhaled, will be harmful to human body, then there is the item will be dirty, and activated carbon, small particles, not only has not grey, even if long time used, packaging will be black but will not have grey, is like the sand again small and grey, again big lumps or there will be a grey, activated carbon itself is black, like pencil will be dyed, time is long will pocket dyed black is normal, but there can be no leakage of ash.

5, 5 look at the size of charcoal bags:

active carbon is a passive harmful gas adsorption, so must be small dispersion effect is good, are generally made of 30 ~ 60 g/bag bag, the bag of a few hundred grams of bags, not lie scattered, use effect is bad, of course.