What Does Thermosetting Resin Mean?
A thermosetting resin can be defined as a resin that is set when heat is applied to it. The thermosetting process is irreversible and the resin undergoes a cross-linking process that imparts high thermal stability, rigidity and creep resistance. The resins are used in the liquid state and harden when cured at ambient temperature or by applying heat or UV light.
Thermosetting resins are used in trenchless rehabilitation methods such as cured-in-place pipe (CIPP) and thermoformed pipe.
Trenchlesspedia Explains Thermosetting Resin
Thermosetting resins are of different types such as polyester resin, vinyl ester resin and epoxy resin. These resins are widely used in the CIPP industry to impregnate liners prior to installation inside the sewer pipe. The resulting liner is strong and durable extending the life of the pipeline considerably. Polyester resin is the most popular and widely used, is cheap, easy to work with, and sets at ambient temperatures. Vinyl ester resin is preferred when corrosion of pipelines is the main cause of concern because it resists moisture absorption.
It has better impact resistance, resistance to high temperature and is stronger than polyester resin-based CIPP. Epoxy resin is not as cheap as the other resins but is the only one that meets the NSF/ANSI 61 potable water requirements, and is the preferred choice for rehabilitating water pipelines.