Hydrotite CJ 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 CJ 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 CJ absorbing water from freshly poured concrete.
Hydrotite CJTA has an additional coating that stops it expanding on contact with water altogether before installation. This coating is dissolved by the alkaline environment of a freshly poured concrete joint, after which it reverts to the performance specifications of standard Hydrotite CJ.
Hydrotite CJ 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.
Hydrotite CJ has a wide range of applications in infrastructure and large-scale construction projects where conditions dictate high performance and a design life in excess of 100 years.