| abstract |
Filter medium based on activated carbon, characterized in that it comprises three superimposed layers, respectively an internal layer and two external layers, the internal layer consisting of 80 to 95% by dry weight of activated carbon, the complement to 100% consisting of organic and / or inorganic chemical fibers, the first outer layer comprising from 45 to 95% by dry weight of organic and / or inorganic chemical fibers, the 100% supplement consisting of activated carbon and / or a material of density less than 0.9, the second outer layer comprising from 5 to 25% by dry weight of activated carbon, the complement to 100% consisting of organic and / or inorganic chemical fibers, and in that the grammage of the layer internal is between 40 and 200 g / m2 and the grammage of the outer layers is between 10 and 100 g / m2. |