Thermally strengthened filter sheet made of polypropylene; for high mechanical stress
and strain, can therefore be used particularly as a filter sheet on the drainage element
EL 202 and on gravel or stone chippings drainage layers; non-rotting; water passage Q
= ca. 40 l/m2 × s at 100 mm water column; effective opening width (O90) according to
European Standard EN ISO 12956: ca. 85 μm; strength class 3; weight: ca. 175 g/m2.