The HYDRO EXPANSIVE JOINT has a particular chemical composition which makes it inalterable in time. Even at maximum expansion it is dimensionally stable. After several cycles of hydration and dehydration it retains the ability to increase its volume. The swelling effect of the joint is mechanically very resistant, elastic, in contact with water begins its gradual and controlled expansion, it has been studied in such a way that the fresh cement can attach to it correctly without it undergoing any deformation.


  • All types of construction joints.
  • Construction joints subject to both temporary and permanent hydrostatic pressure (Approx. 12 bar).
  • Sealing joints between concrete and stone, concrete and masonry
  • Foundations and walls in basements, tunnels, pipes, steel, concrete and precast etc.
  • Construction joints in tunnels, hydraulic works, dams, water tanks, swimming pools and sewage treatment plants.


  • Controlled expansion: it does not create cracks in the concrete even when not fully matured.
  • Dimensional stability: maintains cohesiveness even during expansion.
  • High resistance: resists up to 12 bar of hydrostatic pressure (approx. 120 meters water column).
  • Repeat expansion: maintains performance even after several cycles of expansion.
  • Very flexible: it can be fixed easily by means of riveting or by polyurethane based adhesives.
  • Simple joints: joints executable by simple side by side positioning.