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Product Information
Technical Datasheet


A conformable, swellable polymer/butyl rubber waterstop strip that expands in contact with saline and brackish water. When fully encapsulated by poured concrete, the expansive forces form a seal against concrete faces. The seal resists hydrostatic pressure, stopping water from entering sub-structures.

ADCOR is a unique product that has been specifically developed to provide higher performance than conventional bentonite or swellable rubber waterstops. Superior performance arises from:

  • controlled, reproducible, volumetric expansion.
  • cohesive strength maintained after volumetric expansion.
  • malleable and plastic, enabling easy application to a variety of concrete profiles.

GCP can also uniquely provide continuity of swellable waterstops at construction joint/movement joint intersections. This is achieved by linking ADCOR 500T with SERVITITE AT 200 co-extruded hydrophilic/PVC waterstops.


  •  Construction joints in in-situ concrete structures.
  •  Casting new concrete against existing.
  •  Floor slabs cast against diaphragm retaining walls, steel sheet piles and secant piled walls.
  •  Joints between floor slabs and pile caps.
  •  Pipe penetrations through floors and walls.
  •  Remedial ‘breaking out’ of concrete.


  •  Controlled volumetric expansion - reduces risk of concrete spalling.
  •  Conformable – can be installed onto a variety of irregular substrates.
  •  Retains cohesive strength at both original and expanded volume.
  •  No need for protective steel mesh.
  •  Resists at least 6 bar (60 m) hydrostatic pressure.
  •  Volumetric expansion over 140% in 8% salted water.
  •  Simple overlap jointing on site.
  •  Reproducible swell after wet – dry cycling.
  •  Can be easily joined to GCP PVC waterstops at movement joints.
  •  Unaffected by freeze/thaw cycling.