Filtration geotextiles prevent particles of soil (or other particles) exposed to hydrodynamic forces from being transported into the construction layer that lies past the filtrating material.
Filtration is closely related to separation.
Key properties of filtration geotextiles:
Tensile strength - EN ISO 10319
Elongation - EN ISO 10319
Dynamic perforation test (cone drop test) - EN ISO 13433
Characteristic opening size - EN ISO 12956
Water permeability normal to the plane, without load (velocity index) - EN ISO 11058
