Used as a reactive diluent and crosslinking agent in high-performance composite materials, particularly in aerospace and electronics. Its cyanate ester groups undergo polymerization to form triazine ring structures, delivering excellent thermal stability, low dielectric constant, and minimal moisture absorption. Commonly applied in printed circuit boards, radomes, and structural adhesives where thermal and electrical performance under harsh conditions is critical. Also utilized in formulations requiring high glass transition temperatures and dimensional stability.