Unsaturated Resin VS. Epoxy Resin: What's the difference?
Unsaturated resin and epoxy resin are two commonly used types of resins in the industry. While they may seem similar in some ways, they have distinct differences that should be understood before choosing which one to use for a particular project.
1. Composition
Unsaturated resin, also known as polyester resin, is made from the reaction between a dicarboxylic acid and a diol or polyol. On the other hand, epoxy resin is made by the reaction between an epoxy group and a hardener.
2. Curing Method
Unsaturated resin typically cures by a chemical reaction between the resin and a catalyst, or through the use of heat. In contrast, epoxy resin cures by a chemical reaction between the resin and a hardener, without the need for a catalyst or presence of heat.
3. Properties
Unsaturated resin is priced for its low cost and ease of use, making it a popular choice for making fiberglass parts. However, it can be brittle and have poor resistance to sunlight, which can lead to discoloration and degradation over time. Epoxy resin, on the other hand, is valued for its strength, durability, and excellent adhesion to a variety of surfaces. It also resists moisture and temperature changes better than unsaturated resin.
4. Applications
Unsaturated resin is typically used for applications such as making fiberglass parts, boat building, and repairing automotive body panels. Epoxy resin is often used for coating floors, countertops, and other surfaces requiring a strong and durable finish.
In conclusion, unsaturated resin and epoxy resin have their own unique properties, advantages, and limitations. Careful consideration should be given when choosing which resin to use for a particular project, and proper safety measures should always be observed when handling either type of resin.
