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5 Kinds of Resins Used in Pipe Relining

plumberstives polyester-resin

When you opt for a pipe relining service, you’ll notice that the process wouldn’t be made possible because of the resin compound used in the operation. On the other hand, resin doesn’t only have one type, in fact, there are several types of resin compounds created from different properties and chemicals.

These variations have certain characteristics. For instance, one is highly resistant to corrosion while the other one is not. In opting what kind of resin to be used, make sure that you know well about these types.

Of all the types of resin compound, polyester is the most unsaturated and the simplest. The advantage of this resin is found in its simplicity. This is because of polyester resin, when mixed, isn’t hassle and it doesn’t affect the sturdiness and the performance of the material. Typically, polyester is made using polymerisation of various dibasic acids such as fumaric acid and maleic anhydride at the same time using diols to give ester in its mixture.


Also known as Iso. This is an improvised polyester compound. This kind of resin compound is much more expensive compared to other resin. The resin behind this is that the resin’s thermal resistance reaches up to 55 degrees. Aside from the thermal resistance, the high price of the reason is also because of Iso’s resistance to corrosion and other factors that could damage and deteriorate the entire plumbing system.


Typically, ortho-phthalic is quite popular in the FRP industry. Also, this resin type is one of the cheapest resin compounds in the market. When you opt for this kind of resin, one advantage you get is its resistance to thermal stability, high mechanical properties and corrosion. Lastly, when it comes to its temperature resistance, this resin is at 50 degrees and this resin is suitable for seawater and water supply.

Vinyl ester

According to experts, vinyl ester resin is much better version of polyester. This kind of resin is made through with the combination of epoxy. Because of this, the installation procedure, curing and other features from polyester that are impressive with relation to its durability, structural sturdiness and its capability to resist root intrusion are what makes vinyl ester better than other resins. Apparently, with these advantages, expect that the resin is expensive. In fact, vinyl ester resin is more expensive than Iso.


Phenolic resin is made from the reaction made when combining phenol and formaldehyde. By utilising heat and pressure, phenolic resin can cure itself especially when there are no stimuli to curing provide by curing agents. Unlike vinyl ester and isophthalic, phenolic resins are available in the market with a considerable price. After the resin cures itself, the resin turns into fire resistant even without the help of mineral fillers and fire retardant additives. If the curing process of this kind resin is properly done, it’ll make a carbon to carbon that the resin extremely resistant to temperature. Given with these capabilities, here are some disadvantages with phenolic resin:

  • Small range of colour alternatives
  • Long curing process
  • Has a high level of curing temperature and pressure.