Cured in place pipe (CIPP) lining, is the rehabilitation or reinforcement of pipes without excavation. It has become the method of choice for rehabilitation of deteriorated underground sewers and pipes due to its low installation cost, ease and speed of installation and minimisation of ancillary requirements such as traffic re-routing and security. Cured in Place Pipe (CIPP) Lining is a method of repairing a pipe using a flexible tube impregnated with a resin, which forms a new pipe within the original host pipe once the resin cures.
Heat cured, or ambient temperature curing CIPP lining differs from UV CIPP lining in numerous ways. The basis of all CIPP lining techniques is the resin matrix. The host material of the pipe is impregnated with this resin. Until curing, in this case by heat (hot water or steam) or by a time delay mixing catalyst, it remains liquid.
Unlike UV CIPP liners, heat and ambient cured CIPP liners can be manufactured or impregnated with resin on site and have a short shelf-life.