Copper products: Longitudinally watertight strands

Environmentally friendly, water-sensitive threads caulk up the joined strands against a pressure of up to 60 bar upon humidity longitudinally penetrating. Thus, LEONI offers a green alternative to other solutions involving silicone.

The aforementioned threads operate on the basis of a “super absorbing polymer” (SAP). This material instantly starts to swell at the point of water entering, thereby immediately sealing up cavities and preventing water from further progressing into the cable. In doing so, any damage caused will be restricted to a very limited magnitude.


  • Shipbuilding (civil and military)
  • Submarine cables
  • Computer keyboards
  • Car wash installations
  • Energy cables
  • Control cables

Particular benefits for our customers

  • Silicone-free material
  • Very clean production and processing
  • Reduced weight
  • Environmentally friendly

Manufacturing range

“No pollutants” policy

All materials we use to make single wire are absolutely compliant with RoHS, thus corresponding to EG regulation 2011/65/EU. (See article “Cadmium – end of the line”).

In response to inquiries made, we can confirm that our products do not contain any minerals that originate from regions of conflict. They are in full accordance with the American Dodd-Frank-Act.


Other diameters and materials upon request may be found.

Sales network

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