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What is the Difference Between Epoxy Resin and Polyester Resin?

Updated: Jul 7, 2020

Often, some people said they want to have "resin" without specifying which resin or

some people asked about what is the difference between epoxy resin and polyester resin?

The answer is : It depends on what your project is as to whether you would choose epoxy resin or polyester resin.

There are some information would help you to choose which resin is suitable for your project.

What is Polyester Resin?

↑ Figure 01: Unsaturated Polyester Resin

Polyester resin is widely applied in manufacturing fiberglass-reinforced plastics (FRP) profiles, which are used for structural engineering applications and making FRP rebars. Polyester resins can be used as a strengthening material and as a corrosion resistant polymer composite. Unsaturated polyester resin is the most widely used type of polyester resin which contains double-covalent bonds in its polymer chains.

What is Epoxy Resin?

↑ Figure 02: Diglycidyl ether of bisphenol-A epoxy resin structure

Epoxy resin is a widely used polymer matrix; it is especially used in the production of carbon fiber-reinforced products in structural engineering applications. Epoxy resins are well-known for their adhesive properties along with their strengthening ability. The resins are used as adhesives to bind procured fiberglass reinforced plastic (FRP) strips to concrete. In addition, epoxy resins are applied to the dry fiber sheets in the field and then cured in-situ. This ultimately provides strength by acting as the matrix and as an adhesive that holds the fiber sheet on the substrate.

What is the Difference Between Epoxy Resin and Polyester Resin?

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