The Resins Used for Pipe Relining Repair
If you’re familiar with pipe relining, you’ll know that a resin is plugged into the damaged pipe or the section that’s needed to be repaired with the help of a liner and bladder. The broken pipe remains but the inner part of the pipeline is reinforced with the help of the resin liner. Various types of resin are available for use, but only a few are able to pass the standard tests of the pipe relining industry. Listed below are the common classifications of resins that are usually used in pipe relining.
Polyester is one of the most used resins in pipe relining as well as other pipe rehabilitation processes. Most main line contractors make use of polyester due to many compelling reasons such as: being a totally affordable resin material, quick curing time, and it can be easily mixed with other ingredients to have a longer shelf time. It’s more low-cost compared to the other resins that will be discussed in this list as well as other resin types out there. The curing time is also fast which makes it perfect for tight-scheduled repair projects.
However, polyester isn’t a fool proof resin type as it has various flaws that may discourage a lot of lining contractors. One of the issues with this resin is the styrene compound in its substances. Styrene can give off a peculiar odour that can cause discomfort, especially if the pipes are in a cramped space and has some openings for excavation. The more alarming issue with polyester is its volatile organic compounds (VOC’s) which turn out to have carcinogenic fumes. There is a way out of the carcinogenic issue and it’s by adding proper ventilation in the work site which is an added cost by the way. Lastly, it has an extraordinarily fast shrink rate which means it won’t be as sturdy from its day of application when the liner gets older.
Epoxy resin is more commonly applied by lateral pipe lining contractors as well as in sewer pipe repairs. This is probably the most durable resin liner out there as it has very small shrink rate. It’s still as good as new, decades upon its application in the sewer pipeline. But perhaps the most advantageous part of using epoxy resin is that you won’t have any problems with the chemical compounds that are mixed with the resin since it doesn’t have any chemical smell and VOC’s. This resin liner does have one problem and that is having the longest cure time among the most used resin types. In order to counteract this issue, there is a list of schedules that contractors present to customers and the contractors let their customer select what time suits them.
This resin is some sort of hybrid between the mixture of polyester and epoxy resin. Because of its hybrid characteristics, it has the highest corrosion resistance among the three resin types in this list. Vinyl resin is able to take on chemicals that have pH from 1 up to 14. With regards to its drawbacks, it has the same ones as polyester such as the VOCs, fast shrink rate, etc.