The PENTAFLEX® OBS pre-break elements are part of the PENTAFLEX® joint sealing system designed for the construction of water-impermeable concrete structures (white tank) and are used for creating target ruptures in in-situ concrete walls. They comprise a seam sheet with the tried-and-tested PENTAFLEX® special coating as well as galvanised steel sheet wings which weaken the concrete cross-section. The joint formed is simultaneously secured against pressing water by the integrated sealing element.


  • Watertight to 5.0 bar (2.0 bar in accordance with abP approval)
  • Standardised line visualises the anchoring depth of 30 mm
  • CE-marked product
  • Quick and easy fitting of the elements
  • Reliable generation of the shrinkage rupture
  • Resistant to all organic effluent
  • Simple and reliable connection to the PENTAFLEX KB® seam sheets

Technical Details

  • General supervisory test certificate P-5120/231/09 MPA-BS
  • Galvanised steel sheet with special coating and standardised line
  • European Technical Assessment ETA-15/0003
  • CE-marked