Fleeces are composed of irregular superposed and partly interconnected fibres. Great variation possibilities exist for both the type of fibres and the type of solidification and surface treatment of the fleece material. This allows the filter properties (flow resistance, dirt absorption capacity, filter fineness ...) of fleeces to be varied within wide limits.
The great advantage of filtration with fleece is the flexibility. By simply changing the filter fleece, a filter apparatus can be quickly converted for a new filtration task. Filter fleece is a consumable that must be disposed of after use.