Filter fabric

Geotextile filter fabrics are classified into application classes N1–N5 according to the required performance level in civil engineering applications. N1-class filter fabrics are suitable for light-duty applications such as landscaping, garden construction, beaches, yards, pathways, and building sub-base layers. N2-class products are intended for more demanding building foundations and for the rehabilitation of road base structures. N3-class filter fabrics are designed for demanding applications such as heavy traffic road bases and public roads. N4-class filter fabrics are suitable for very demanding conditions, including construction on soft subgrades and applications involving heavy aggregate placement. N5-class filter fabrics are intended for extremely demanding conditions, such as construction on very soft subgrades or situations where large rock materials are placed, for example in blasting operations. Small packages of filter fabrics are available for yard construction.