There are actually a lot of resins used in pipe relining, and every single one of them has its own characteristics, benefits, and uses. However, in this article we will only take a look at the basic resins. You see, despite the wide range of resins applied in relining, it’s the basic ones that are commonly used. Three of the primary resins include epoxy, polyester, and vinyl ester. Learn more about the basic resins and their features below.
For the majority of lateral lining contractors out there, epoxy resin is the clear choice for their sewer pipe relining. This is the most durable and safest resin option among the three. Epoxy has a low shrink rate and has the ability to maintain its tight structure, lowering the need for tracking the status of the pipe. Furthermore, the resin doesn’t produce any odours coming from its chemical composition. Despite its engaging characteristics and advantages over the other two resin options, epoxy has its own drawback. The main issue with epoxy is that it takes too much time to be cured, mainly because it’s denser and has a more stable structure. There were projects in which it took eight hours for the epoxy resin to be cured or hardened. Due to this problem, contractors often create systematic scheduling when using epoxy for pipe relining. In summary, epoxy is definitely a great resin material, the long cure time is its only issue but can overlooked thanks to its stability, safety, and among other perks.
Polyester is another preferred resin liner by contractors. There are three reasons why polyester is so popular: its general composition is compliant to standard requirements that are set for sewer pipe relining, a very affordable selection since it’s the less costly among the three resins, and it also has a fast curing time. It can also be combined with liners and catalyst to extend its shelf time and to hasten the curing process. Just like epoxy, it has its own downsides that may discourage some property owners. Polyester can emit chemical odours due to the properties of its styrene material. Apart from that, the resin also has volatile organic compounds (VOC’s), which turns out to be carcinogenic. In order to get rid of these VOC’s, contractors must add proper ventilation when placing polyester resin–which adds to the expenses. Lastly, it has a relatively fast shrink rate which will prove problematic in the long run.
Vinyl Ester Resin
Vinyl ester is a combination of both epoxy and polyester which makes it a compound resin. The main benefit with this resin is that it’s almost invulnerable to corrosion, in other words this resin is able to endure constant exposure to chemicals. Because of its high resistance to chemicals, vinyl has a longer lifespan than most pipe materials out there. In terms of cost, vinyl is more expensive than polyester and its price is near epoxy. It shares the same drawbacks with polyester like styrene odour, carcinogenic substances and the low shrink rate.