The patented Cruma filtration system is based on the adsorption phenomenon.

The filters supplied by Cruma are manufactured using active carbon that comes from the shells of coconuts, as this type has the greatest proportion of micropores, which makes it the best choice when adsorbing gas contaminants. There are six types of filters and these are used in different combinations giving us a total of 15 different types (e.g.: AD, BED, FD, etc.)

Type A

General use filter, especially appropriate for organic fumes, such as ketons, ethers, alcohols, xylenes, etc. These can be used with inorganic acids, but only if these are not too abundant, as the active carbon has not been impregnated and any excess acid fumes will quickly saturate it.

Type BE

For inorganic acid fumes such as: H2SO4, HCl, HNO3, as well as for volatile sulphur compounds such as H2S, SO3, etc. These filters can be used with organic fumes as the active carbon has been impregnated with metal compounds and neutralising salts. They can be used with both organic and inorganic fumes provided these are present in similar proportions.

Type F

For formaldehyde and formol fumes and their derivatives; can also be used with other organic compounds. Carbon is impregnated with KI, and, as such, should never be used with inorganic acid fumes.

Type K

For NH3 fumes and amines; also useful for other organic compounds. The carbon is impregnated with metal salt complexes.

Type ABEK

Mixed type to be used when the proportions between organic, inorganic and NH3/amines are similar.

Type D

HEPA H-14 (High Efficiency Particulate Air filter) with an efficiency rate of 99.995% for particles of 0.3 μm (a maximum particle penetration). Recommended for more complicated applications that generate a great deal of dust, fumes and/or aerosols and that require a high degree of protection.

This filter can be combined with any of the aforementioned depending on the requirements of the job in question.

CARBON FILTER TYPE ABEK