External waterproofing wedge ND 240 made of EPDM for expansion joints, roll 20 m.p.

The ND 240 waterstop is designed and used to seal and prevent water penetration into moving joints in monolithic construction.

It is used on a variety of objects: from foundations to subway tunnels.

It is mounted directly into the body of the reinforcing cage before pouring the concrete mortar. The hydraulic wedge has been widely used in hydraulic structures, such as dams, weirs, reservoirs, canals, locks, water intake structures and hydroelectric power plants, as well as for sealing joints in foundations, tunnels, multi-storey car parks and other underground structures.

External expansion joint seals ND series are used for waterproofing expansion joints when combined with existing concrete and metal structures. They are made of EPDM (Ethylene Propylene Diene Monomer) - ethylene-propylene-diene rubber.

Main advantages:

• ensures reliable embedment in concrete structure.

• ribbed surface guarantees tightness, preventing moisture from penetrating.

• deformation zones allow the hydraulic wedge to compensate for movements of reinforced concrete structures without losing tightness.

• used to seal joints between two concrete structures.

• in critical structures, the possibility of additional use of an internal hydraulic key is provided.

• meets high requirements for structural tightness.

Technical specifications:

·   Material : EPDM

·   Color : black

·   Winding : 20 m.p./25 m.p.

·   Roll length deviation : no more than ±0.5 m

·   Dimensions : according to design documentation

·   Shore hardness, A : 70 ± 5

·   Density : ≈ 1.4 g/cm³

·   Tensile strength : ≥ 10 MPa (DIN 53455)

·   Elongation at break : ≥ 275%

·   Temperature resistance : from -35 °C to +70 °C

·   Chemical resistance :

• to constant exposure to water and wastewater;
• to short-term exposure to low-concentrated inorganic alkalis and acids, and mineral substances.

·   Resistance to UV radiation : not stable.

·   Service life : at least 25 years.