Hydrophilic Volcanizing Expanding Rubber Tape

FOX SWELLING TAPE 520, Chloroprene is a flexible water-retaining tape based on rubber and hydrophilic resin that swells when in contact with water.

Usage Areas

  • In the joints of ready-mixed concrete elements,
  • In construction joints in reinforced concrete structures poured in place (cold joints where curtains meet with foundations, etc.),
  • As a watertight flange at the pipe inlet outlets passing through reinforced concrete,
  • In tunnel segments,
  • In the joints between the slab and the pile foundation heads,
  • Concrete is used in steel joints.


  • Easy to apply.
  • It is economical.
  • In contact with water, its expansion continues up to 500%.
  • It has a protective coating that prevents premature expansion. FOX SWELLING TAPE 520 starts to swell late compared to standard inflatable tapes. Under normal conditions, the onset of swelling is 7 days after contact with water. This prevents the product from swelling when it encounters unwanted water in the construction site environment (rain, etc.) In addition, with the effect of concrete water in the first contact with fresh concrete, the concrete will swell before it starts to get a socket and prevent the formation of unwanted space between the concrete and the inflating band.
  • It is flexible, can be applied to uneven substrates.
  • In reinforced concrete, including concrete elements, it expands in contact with water and forms a sealed gasket.
  • It has the property of expanding again in contact with water.
  • The range of resistance to chemicals is wide.
  • It is resistant to petroleum products, minerals, vegetable oils and greases.
  • FOX SWELLING TAPE 520 is impact resistant.
  • It is suitable for use in areas where the water level rises and falls, in polluted / slurry water.



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