Used primarily as a reactive diluent in unsaturated polyester resins, improving workability and reducing viscosity without compromising curing properties. Enhances the mechanical strength and thermal stability of resins used in composites, coatings, and fiberglass-reinforced plastics. Also serves as a chemical intermediate in the synthesis of specialty polymers and resins. Its lower volatility compared to styrene makes it advantageous in applications requiring reduced emissions during processing.