In the pipe relining industry, there are multitudes of options when it comes with the resin used for the liner. The resin may come in different variations but it actually comes down with three basic resin types. These three include the epoxy, polyester, and the vinyl ester. In this article, we’re going to take a look at each of the resins’ characteristics, features, benefits, drawbacks, and other important facts.
The Epoxy Resin
Epoxy is a popular choice by lateral lining companies and most sewer pipe relining operations, mainly because this specific resin is very durable and can last approximately for a lifetime. In fact, epoxy is actually the sturdiest among all the other basic resins. Additionally, it’s able to bond with the existing pipes and has a low shrink rate. All resin liners shrink as they age, and this can actually affect the structure and lining of the pipeline. Epoxy resin has a negligible shrink rate, making it an ideal resin liner. Some resin liners are composed of styrene which can produce a strong chemical odour.
Epoxy doesn’t have any styrene material or other types of substances that give off smells. This resin liner is far from perfect, as it has one particular drawback; it really takes a long time for it to be cured. You see, in the pipe relining process, the inserted resin liner must be cured so that it can bond with the inner pipe lining quickly. The reason for this is that epoxy can’t be stored while mixed with the resin liner for an extended period of time; which means it has to be mixed with the liner on the day of the operation or days or weeks before the job. There were cases in which it took more than eight hours for the epoxy resin to be cured. Because of this issue, contractors create constant supplies and maintain strict schedules for their pipe relining work.
The Polyester Resin
Polyester resin is preferred by main line services than lateral contractors. This is very economical since it’s the most affordable option among the other resin liners, and also meets the standard stipulations in the pipe relining industry. It can be mixed with other materials to hasten the curing time. Polyester resin has a lot of more issues than epoxy resin. One of the disadvantages in using polyester is the fast shrink rate. The more annoying and alarming problem is the composition of volatile organic compounds and the fact that it has styrene. As what you have read earlier, styrene can discharge chemical fumes and can be dangerous at a certain extent.
The Vinyl Ester Resin
This one is basically a hybrid of the other two basic resins. Its special feature is its ability to be able to repel high amounts of chemicals, and thus, making it resistant to any form of corrosion. Epoxy and polyester can fend off chemicals that have pH range of 1 to 11, while vinyl ester can take on substances that have a range of that are marginally lower than 1 to 14. Its price is close to epoxy but slightly cheaper. Vinyl ester has basically the same issues with polyester.