The application dimension of the Diethylenetriamine market is dominated by its role as an epoxy curing agent, accounting for roughly 38 % of total revenue. This segment leverages DETA's tri‑functional amine structure to accelerate cross‑linking, driving demand in aerospace, automotive, and construction coatings. The corrosion inhibitor application follows with an estimated 25 % share, where DETA forms protective films on metal surfaces, extending equipment lifespans in marine and infrastructure projects. Polymer synthesis contributes about 20 % as DETA acts as a chain‑extender and cross‑linker in polyurethanes and polyamides, supporting the growing plastics sector. Textile finishing represents 12 % of the market, utilizing DETA for dye‑fixation and wrinkle‑resistance treatments, especially in performance fabrics. Finally, oilfield chemicals hold a modest 5 % share, where DETA serves as a scale inhibitor and catalyst in drilling fluids. Together, these application sub‑segments define the overall Diethylenetriamine segmentation and dictate strategic investment priorities.