The Chain Transfer Agent in Polymerization segmentation by application distinguishes the market according to the end‑polymer product that drives demand for specific transfer agents. In the PVC segment, transfer agents are employed to regulate molecular weight distribution, enhancing processability and mechanical performance; this segment accounts for the largest share of the market due to the extensive global PVC pipe and profile production. The ABS application leverages transfer agents to achieve a balance between impact resistance and rigidity, supporting automotive and consumer‑goods manufacturing, and contributes a substantial portion of revenue. Polystyrene applications, particularly in rigid and expandable forms, rely on precise chain‑transfer control to meet foam density specifications, representing a notable share. Polyethylene applications, especially low‑density grades, use transfer agents to tailor melt flow characteristics, influencing packaging and film markets. The residual "Other" category aggregates niche polymers such as acrylonitrile‑butadiene‑styrene copolymers and specialty elastomers, reflecting emerging uses and regional variations. Collectively, these application sub‑segments define the overall market size by allocating demand across distinct polymer production streams.