Trenchless pipe bursting replaces your water main by essentially fitting an existing pipe with a new one. In general, this method is used to update water lines, repair a broken pipe that is otherwise structurally sound, and improve the pipe system.
For pipe bursting, the plumber would push or pull through a brand new pipe using a hydraulic process, so the material would depend on the type of pipe being used or recommended by local plumbing codes.
The plumber or specialist creates a small hole at the beginning and end of the existing pipe. Using a hydraulic machine, the replacement pipe is pulled through the old pipe. This method breaks up the old pipe as it moves through, so you would only use this method if the old pipe needs to be replaced or if the repair is unfixable otherwise.