Swellable Thermoplastic Gasket for Segmental Structures

VELOSIT WS 805 is a swellable gasket manufactured from a blend of proprietary thermoplastics and swelling agents compounded to  produce a re-swellable seal of unique swelling ability. VELOSIT WS 805 is used to seal joints between pre-cast segments.

Typical applications:

  • Sealing between pre-cast segments
  • Sealing between potable water pipes
  • Sealing sewage & wastewater pipes
  • Waterproofing of wall/slab joints


  • Profile includes 2 protrusions to form double parallel compressible sealing lines
  • 1000 % swelling capacity; fully reversible for an unlimited number of cycles
  • High water retention means delayed shrinkage when dry
  • Dimensionally stable; does not wash-out like Bentonite waterstops
  • Delayed swelling; volume increase starts after approx. 2 weeks of contact with water allowing water curing of precast units and/or placing of segments and pipes in wet conditions
  • Swelling pressure resistant to 5 bars (73 psi) hydrostatic water pressures up to 50 m (160 ft.) acc. to EN 12390-8
  • Extremely flexible: easily bent to take the shape of concrete segment


Here you can find detailed information about the selected VELOSIT product.

Technical Data Sheet Safety Data Sheet Test report Testing of waterstop strip VELOSIT WS 805

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