| CIPP liners | A flexible, resin-impregnated tube inserted into a damaged pipe, where it cures to form a new pipe within the existing pipe. |
| CIPP lining | A pipe rehabilitation method using resin-impregnated liners. CIPP stands for “Cured-in-Place Pipe”. |
| Trenchless rehabilitation | Rehabilitation carried out without excavating the pipe. |
| LED light curing | Curing the liner resin using LED light instead of heat (hot water or steam) or UV gas-discharge lamps. |
| Blue light (450 nm) | The wavelength range of Bluelight LEDs, precisely matched to the photoinitiators in the resin. |
| UV curing | A conventional light-curing method using UV lamps. It serves as the comparison method for LED curing. |
| Heat curing | Curing with hot water or steam, usually used for epoxy resin liners. It requires considerably more energy. |
| Photoinitiator | An additive in the resin that triggers curing when exposed to light of a specific wavelength. Patent-protected at Bluelight. |
| Vinyl ester resin | A reactive resin with very high chemical resistance. Bluelight uses the styrene-free AP450 variant. |
| Polyester resin (UP) | A styrene-containing reactive resin, available from Bluelight as PB450 for the GF-Liner. |
| Styrene-free | Resin containing no styrene, resulting in low odour and low emissions during installation. |
| Resin carrier | The liner material that absorbs the resin, such as synthetic fibre or glass fibre. |
| PAA F-Liner | A flexible Bluelight liner with a synthetic fibre carrier for DN70–DN400. It can negotiate bends of up to 90° and accommodate changes in nominal diameter. |
| PAA GF-Liner | A Bluelight liner with a glass fibre carrier (GRP) for DN150–DN600 and egg-shaped pipe profiles. Installed using the pull-in method. |
| GRP | Glass-reinforced plastic, offering high strength and stiffness. |
| Inversion method | An installation method in which the liner is inverted into the pipe using air or water pressure. |
| Pull-in method | An installation method in which the liner is pulled into the pipe using a winch and then inflated. |
| Support tube / calibration tube | An inner tube that presses the liner against the pipe wall during curing. Bluelight tubes transmit light and some are reusable. |
| Open-end rehabilitation | Rehabilitation of a pipe that does not terminate in a manhole at one end, for example at an inspection opening. |
| DN (nominal diameter) | A standardised designation for a pipe’s internal diameter in millimetres, for example DN150. |
