Nonwovens - Filtration. Separation. Protection.

Effective and economic

Nonwovens for filtration

Nonwoven geotextiles with their 3d-internal structure, although rather thin, serve as very efficient filtration device for soils, suspensions and water. Regarding filtration, there is a distinction between mechanical filtration – “soil/solid particle retention” - and the hydraulic filtration efficiency – “water permeability”, with no backwater from seepage allowed.

Nonwovens for separation

As a separating layer, geotextiles prevent adjacent soils or fill materials from mixing with each other. The selection of the appropriate product depends on the grain size distribution of the base course materials and the expected loads from e.g. construction operations or any other static/dynamic impacts.

Nonwovens for protection

Nonwovens can be used for protection purposes for sealing geomembranes. Besides the thickness of the nonwoven and robustness class (derived from mass per unit area and the puncture resistance “CBR-value”) and penetration resistance (protection efficiency) are important characteristics.


The quality of the fibers used and the needle-punching resp. mechanically bonding are of crucial importance for the quality of the end product. Mechanically bonded nonwovens are more elastic and thus more robust against mechanical damage, such as breakage / tearing / puncturing. For this reason, FRANK nonwovens are needle-punched.

Note: Nonwovens should only be applied for functions of filtration, separation, drainage and protection. They are not suitable for reinforcement. For this application, please refer to our wovens, geogrids and geocomposite made of geogrid and nonwoven.