Hydroxyethyl methacrylate (HEMA) is a colorless liquid that is commonly used in the production of polymers and resins. It is a type of methacrylate monomer, which means it can be chemically bonded to form larger molecules. HEMA is valued for its ability to improve the flexibility and adhesion of materials, making it useful in various applications, including coatings, adhesives, and dental products. In the field of dentistry, HEMA is often used in dental adhesives and sealants due to its biocompatibility and ability to bond well with tooth structures. Additionally, it is utilized in the manufacturing of contact lenses and other medical devices, where its properties contribute to comfort and durability.