A Brief Guide on the Types of Resin Commonly Used in Pipe Lining

Cured-in-place pipe (CIPP) lining offers a durable solution for repairing damaged or deteriorating pipelines without the hassle of extensive digging or full replacement. Central to this process is the use of resin, which coats the flexible lining material and allows it to harden into a strong, long-lasting pipe within the existing one. USA Pipe Repair explores three types of resin commonly used in trenchless pipe lining in Henrico, VA, and their unique properties.

Polyester Resin

Polyester resin is a popular choice for sewer pipe lining due to its low cost, high strength, and versatility. It is composed of a combination of polyester monomers and styrene, which act as a thinner to make the resin more fluid during application. It is commonly used in large municipal plumbing systems.

Polyester is ideal for outdoor projects, as it emits a strong odor and styrene is a volatile organic compound (VOC) that can be harmful if not used in a well-ventilated area. One upside is that the lining material can be pre-soaked in the resin off-site, and then transported to the location for installation.

Epoxy Resin

Epoxy resin is widely preferred for CIPP pipe lining due to its durability, chemical resistance, and environmental safety. Unlike polyester or vinyl ester resins, epoxy is a two-part system that cures through a chemical reaction when the resin and hardener are combined. This curing process ensures a strong, long-lasting bond with the pipe surface, making it particularly suitable for repairing and reinforcing aging residential or commercial infrastructure.

One of the key advantages of epoxy resin is it doesn’t release any carcinogenic compounds, making it safe for potable water systems. It also has low shrinkage during curing, which helps create a seamless lining inside the pipe. Unlike polyester, however, epoxy resin cannot be pre-mixed because it has a limited pot life (the amount of time before it hardens).

Vinyl Ester Resin

Vinyl ester resin is a product that combines the strength and durability of epoxy with the flexibility and ease of use of polyester. It is created by reacting an epoxide group (found in epoxy) with an unsaturated acid (found in polyester). This results in a unique chemical structure that offers both toughness and resistance to corrosion.

What can be considered as a disadvantage of vinyl resin is its similarity to polyester, as it also tends to shrink after curing—meaning this has to be carefully taken into consideration during the cast iron pipe lining repair.

As one of the trusted local pipe lining companies in the area, USA Pipe Repair is well-equipped with the knowledge and expertise to safely and effectively complete trenchless repairs. We will always prioritize eco-friendly and non-invasive methods to give our clients the best results without causing harm to their well-being or the environment. Call us today or complete our online form to schedule an appointment.