Environmental Techniques

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UV-Cured Lining

UV-curing technology has developed over recent years and is becoming widely used as the preferred method for curing liners, used instead of hot water or steam curing. Environmental Techniques UV-cured CIPP process ensures pipes can be relined quickly and efficiently to rehabilitate defects and prevent infiltration with minimal impact on the hydraulic performance of the pipe.


Provides a jointless corrosion proof pipe-within-a-pipe

Installation typically takes a few hours including setting up of equipment

Can be used in sewers from 100mm – 2800mm

Different shapes and sizes can be accommodated



The felt liner is impregnated with a UV-curing resin at the manufacturer's facility. The liner is transported to site in special boxes to prevent sunlight reaching the liner, which would begin the curing process. The liner is winched into place inside the host pipe, and inflated using compressed air. Once fully inflated, the ultra violet light train passes through the liner from one end to another, at a specified speed controlled by the on-board computer. As the resin comes into contact with the ultra violet light, the curing process begins. Once the full length has been cured, the air pressure is released and the excess material at each end is cut off. Connection openings and post-rehab CCTVs can be undertaken.



When compared with ambient / steam / boiled water curing, UV offers the following advantages.

 Faster installation times

 Smaller site footprints with less vehicles required on site

 No requirement for water to be transported to and from site

 Liners designed for UV curing are usually thinner than those designed for boiled water or steam curing





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