Polyester resin is a type of thermosetting synthetic resin derived from the reaction between polymeric ester monomers and a cross-linking agent. It is a versatile and widely used material in various industries, including construction, automotive, aerospace, and marine.

The key characteristic of polyester resin is its excellent mechanical properties, including high strength, stiffness, and resistance to impact. It also exhibits good chemical resistance, making it suitable for applications where exposure to harsh environments or corrosive substances is expected.

Another notable feature of polyester resin is its inherent versatility. It can be easily modified with additives such as fillers, reinforcements (e.g., fiberglass), pigments, and flame retardants to enhance specific properties or achieve desired functionalities. This versatility allows for a wide range of applications, including casting and molding of various objects, laminating fiberglass composites, and creating protective coatings.

Polyester resin is known for its favorable processing characteristics. It has a relatively low viscosity, enabling it to flow easily and fill complex molds or cavities. It can be cured at room temperature or by applying heat, depending on the specific formulation and desired curing time.However, it is important to note that polyester resin is not suitable for applications requiring high temperature resistance, as it may undergo degradation at elevated temperatures.