abstract |
In a watertight membrane comprising a Schott layer of thermoplastic material, the Schott layer on the upper side has an arithmetic mean roughness R a according to DIN EN ISO 4287: 1998-10 of 0.01-0.8 μm. As a result, the tendency to fouling is significantly reduced. Furthermore, such membranes, especially after storage at elevated temperatures, easier to roll. |