Used as a monomer in the synthesis of high-performance polymers, particularly in the production of polyethers and polyesters with enhanced thermal stability and mechanical strength. Its rigid spirobifluorene core contributes to improved glass transition temperatures, making it valuable in advanced materials for electronics, such as dielectric layers in organic thin-film transistors and components in OLED devices. Also employed in the development of transparent, heat-resistant resins for optical applications and coatings.