The application layer dominates the 1, 3-Propanediol market, accounting for roughly 100 % of demand. Polytrimethylene terephthalate (PTT) fibers represent the largest share at about 40 %, driven by textile manufacturers seeking high‑performance, biodegradable polyester. Solvent applications follow with a 25 % contribution, where 1, 3‑Propanediol is valued for its low toxicity and high boiling point in coatings, inks, and cleaning formulations. Personal‑care products, encompassing cosmetics and detergents, hold a 15 % slice, reflecting consumer preference for sustainable ingredients. The pharmaceutical segment, at 10 %, leverages the diol’s role as an intermediate for active‑ingredient synthesis, while the food‑and‑beverage niche also accounts for 10 % through its use as a humectant and flavor carrier. Collectively, these sub‑segments shape the overall market size, and the proportional breakdown is illustrated in the accompanying pie chart, reinforcing the relevance of precise 1, 3‑Propanediol segmentation for strategic planning.