Hydroxyl-terminated polybutadiene (HTPB) is a type of synthetic rubber that features hydroxyl groups at both ends of its polymer chains. This structure allows it to be used as a versatile binder in various applications, including adhesives, coatings, and sealants. HTPB is known for its excellent flexibility, resilience, and chemical resistance. In addition to its use in commercial products, HTPB is also important in the aerospace and defense industries. It serves as a key component in solid rocket propellants, where it acts as a binder that holds together the fuel and oxidizer, ensuring efficient combustion and performance.