Hydrotite KT

Used as a waterstop in concrete construction joints requiring effective, economical protection against hydrostatic pressures up to 0.1 MPa (10 metre head of water).

Product Description

Hydrotite KT is a composite strip of blue hydrophilic (water absorbing) and black non-hydrophilic rubber.

On contact with water, the hydrophilic rubber expands to seal gaps and prevent further water ingress in precast and cast-in-situ joints. The dark blue hydrophilic rubber turns light blue as it absorbs water, giving a clear visual indicator of any premature expansion.

Hydrotite KT has a central void that absorbs pressure in the initial stages of expansion to reduce the risk of concrete cracking.

A delay action coating prevents immediate expansion on contact with rain and moisture during transport, storage and installation. It also stops Hydrotite KT absorbing water from freshly poured concrete.

Hydrotite KT is chemically inert and has passed the WRC Tests of Effect on Water Quality (BS6920), making it suitable for use in potable water applications. It is resistant to mineral and vegetable oils, petrol and many other chemicals.


Performance principles: Hydrotite KT absorbs water across its hydrophilic rubber component, increasing in thickness by up to 70% depending on water chemical conditions. In cast-insitu joints, it provides protection up to 0.1 MPa (10 metre head of water).

When integrated into a concrete joint, Hydrotite KT achieves a durable seal by:

  • Conforming to gap variations to create a conventional packing effect
  • Expanding under contact with water to seal any remaining gaps in the joint
  • Retaining expansion qualities throughout its design life to seal in any further gaps that develop through settlement

Typical uses

Hydrotite KT has a wide range of applications in residential and light commercial building projects where hydrostatic pressures up to 0.1 MPa (10 metre head of water) dictate the use of a standard performance waterstop.

  • Underground residential parking
  • Swimming pools
  • Basement structures
  • Tanks and cesspits
  • Retaining walls
  • Foundations
  • Garage and outbuilding slabs.

Product Downloads

Hydrotite KT Brochure
Hydrotite KT Material Safety Datasheet
Hydrotite KT

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