“I installed a competitor’s liner. It melted, sagged and plugged the sewer pipe I’d lined. Why? I thought the resin used in these systems was stronger than other materials.”
All plastics aren’t the same. For example, if you are plumbing a high-efficiency gas furnace or water heater, many manufacturers require you to use CPVC pipe to prevent the “melting” of regular Schedule 40 PVC pipe. The CPVC material is formulated with a resin that can handle higher temperatures.
The same is true for the resin systems used in CIPP lining processes. The answer to your question is in the resin selection you
