PM 20

Dimpled sheet

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.

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