Used as a high-performance antioxidant and heat stabilizer in polymers, especially in engineering plastics and rubber, where it prevents thermal and oxidative degradation during processing and extended use. Its phenolic groups provide strong radical scavenging ability, while the disulfide linkage contributes to regenerative stabilization mechanisms, enhancing long-term thermal stability. Commonly applied in automotive components, electrical insulation, and industrial rubber goods exposed to high temperatures. Also serves as an intermediate in synthesizing specialty chemicals and UV absorbers for coatings and adhesives.