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6 Common Types of Resin Compounds

plumberbrookvale polyester resin

Resin compound can be considered as the most important part of the pipe relining process. There quite a variety of resin compounds that come from different chemical families and have different properties that deems them efficient in certain situations and environmental conditions. They have varying characteristics that protect them from corrosion and other chemical reactions. Here are 6 of the most common resin compounds used in plumbing:


  1. Polyester

This resin is considered to be the simplest and most unsaturated among all resin compounds. One of its advantages is the simplicity of the compound when mixing that it does not require too much hassle while not affecting the performance and sturdiness of the material. This type of resin is created using polymerisation of different dibasic acids such as maleic anhydride and fumaric acid while using diols to provide ester in the mixture.


  1. Orthophthalic

Also known as GP (General Purpose Polyester) or Ortho. This resin is a popular commodity of the FRP industry and used to be one of the cheapest priced resin compounds. Few of the advantages of GP polyester are that it has high resistance to corrosion, outstanding thermal stability and exceptionally high mechanical properties. The temperature resistance of this resin is at 50 degrees that work well on water supply and seawater.


  1. Isophthalic

This is an enhanced polyester compound that is also known as “Iso”. The thermal resistance of this resin compound is at 55 degrees which makes it much more expensive than the other types of resins. Due to the pricing, one can be assured of a higher resistance to corrosion and other factors that lead to damages to the plumbing system.


  1. Vinyl Ester

Vinyl ester resins are better versions of polyester resins that are made through combining it with epoxy. Its advantages include easy installation, processing, curing and contribute features that are derived from polyester that have an impressive performance in terms of durability, resisting intrusion and structural sturdiness.  Its setback is that it costs more than Isophthalic Resin Compound.


  1. Phenolic

This type of resin is derived from the reaction created by combining formaldehyde with phenol. The resin cures itself using pressure and heat when there are no stimuli to curing presented by external curing agents. This type of resin has been available to the masses at a reasonable price. As this resin cures, it becomes fire resistant even without the aid of fire retardant additives and mineral fillers.

If this resin is properly cured, it creates a carbon to carbon composite with excellent resistance to temperature. Given these advantages, it is only natural that the resin has its fair share of setbacks:

  • Long downtime needed for curing.
  • Only has a small range of colour options.
  • Possesses a high level of curing pressure and temperature.


  1. Epoxy

Guaranteed that there are dozens of different types of resins available on the market, epoxy resin is the best type of resin you can find and this is due to its three-dimensional density and top-tier performance. But, like every other compound, epoxy has its own setbacks:

  • Costly
  • Heat is needed for curing
  • Complications during installation are to be expected

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