PM 20
PM 20 is a high-performance dimpled sheet with 20 mm-high dimples, and the ideal solution for draining rising, seeping and backwater in tunnel constructions.
PM 20 is a high-performance drainage membrane and is considered the ideal solution for the drainage of rising, seepage and backwater in tunnel constructions. Compared to conventional dimpled membranes, it offers many times the drainage capacity. PM 20 is used in civil engineering, e.g. as a lost formwork between shoring and concrete structure wall.
Any water that accumulates can then be drained off accordingly during the shell construction phase.
The dimple height of 20 mm offers an enormous drainage capacity of approx. 8,54 l/s·m.
The pressure resistance of approx. 160 kN/m² ensures a high level of security and corresponds to a compressive strength of 16 t per m2.
PM 20 offers great advantages in tunnel construction. When laid horizontally, it absorbs large quantities of mountain water and safely discharges it into the drainage pipe at the base.
The large drainage cross-section creates safe reserves for possible cross-sectional constrictions due to sintering.
Technical Data
| Material | HDPE approx. 1.000 g/m² |
|---|---|
| Dimple height | 20 mm |
| Compressive strength | approx. 160 kN/m² |
| Water flow capacity in the plane | approx. 8,54 l/s⋅m |
| Air volume between the dimples | approx. 14 l/m² |
| Temperature resistance | –30 °C to +80 °C |
| Fire behaviour | class E; B1 acc. to class A possible for special structural requirements |
| Roll length | 20 m (Additional lengths on request) |
| Roll width | 0,5 m / 1,0 m / 1,5 m / 2,0 m |
| Chemical properties | chemical-resistant |
| Biological properties | resistant to bacteria and fungi, rot-resistant, root-resistant |
| Physiological properties | safe for drinking water |
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