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Secutex® Green is a 100% biodegradable, mechanically bonded nonwoven. Its biodegradability is cer-tified, which means that residues of the product cause no harm to the environment. It is UV-resistant and can therefore be used in uncovered applications. It is a temporary solution, and vegetation and their roots take over the desired filter properties after its service life. No plastic is entered into the environment during the installation, operation, or renaturation of the product, and after its service life it can remain onsite or as composting after renaturation. Due to the industrial production of the fibres and the constant needling process, a continuous and reproducible quality of the nonwoven is ensured. This also ensure that the product can be assigned to a geotextile robustness class (GRK). The GRK (the abbreviation for the German word Geotex-tilerobustheitsklasse) is a German classification system to indicate the robustness of a nonwoven, and they are assigned to a geotextile robustness class according to their mass per unit area (gramage) in conjunction with the stamp penetration force. This classification is only used and recognized in Ger-many, so the product names without this behind it are used internationally (and will be used through-out this background report). The product is available in the robustness classes GRK 2 to GRK 5, and in widths of 2m, 4m, and 6m in standard. Variations from this are available on request (see also 3.1).