| abstract |
Discloses a liner for repairing a damaged pipe, e.g., an underground sewage or a gas pipe. The liner comprises a TPU coating on a fibrous mat of a nonwoven fabric. The TPU coating contains a barrier layer to prevent the styrene from moving from the liner to the pipe used to press the liner against the damaged pipe and to activate the thermosetting resin. The thermosetting resin converts the liner from a flexible state to a rigid state as the liner is cured in-situ within the pipe. |