Henicosanedioic acid is primarily used in the field of polymer chemistry as a building block for the synthesis of long-chain polyesters and polyamides. Its extended carbon chain provides flexibility and durability to the resulting polymers, making them suitable for applications in coatings, adhesives, and specialty plastics. Additionally, it serves as a precursor in the production of high-performance lubricants, where its molecular structure contributes to thermal stability and reduced friction. In research, it is utilized to study the behavior of long-chain dicarboxylic acids in various chemical reactions, aiding in the development of novel materials with tailored properties.