Type EFST filter cartridges of filtration grade CA are mainly designed for separating oil vapours from compressed air flows (dry-type filtration). The properties of the activated carbon are especially suitable to separate gaseous contaminants. Filtration grade CA is therefore used, if there are no liquid contaminants in the compressed air flow.

EFST..CA filter cartridges consist of a loose activated carbon granulate filling, embedded between two coarse filter cloths and mesh screens. Furthermore a pleated general purpose filter ele-ment (Z) is fully integrated into the cartridge downstream in order to reliably prevent even the finest activated carbon dust from leaving the filter cartridge. A transparent perspex cylinder as a main body makes the granulate filling visible, the pleated general purpose filter media is located between two stainless steel cylinders. Both granulate and filter stage are completed / separated by plastic end caps. The adsorptive activated carbon stage as well as general purpose filter stage is fully incorporated in a single, compact cartridge unit. As a result a further downstream dust filtration is no longer required.

Cartridges in general offer much higher amounts of activated carbon compared to same size filter elements. The longish shaped activated carbon bed ensures a long contact time of the compressed air with the activated carbon and thus a high separation efficiency and long lifetime. The integrated general purpose filter makes a downstream dust filtration by means of a complete separate dust filter unit superfluous (housing and element) and thus reduces differential pressure and costs - operating as well as investment costs.

All the features mentioned above contribute to a filter cartridge which has a long service life (high adsorption capacity) combined with economic efficiency (low differential pressure, investment costs) and maximum operating safety (integrated design). This guarantees an extremely low residual oil content.