In petroleum refining, corrosion inhibitors for coker units are specialized formulations designed for high‑temperature, refractory environments. Production is limited to specialized chemical suppliers. In 2025 refiners are investing in inhibitors compatible with longer coking cycles and heavier feedstocks. Prices have increased in early 2025 owing to tighter supply of specialty amine‑based inhibitors and more stringent performance specifications. Growth is driven by rising heavy crude processing in Asia‑Pacific and regulatory pressure on maintenance downtime. Forecast shows inhibitor volume growth of ~3–5 % annually, with price growth slightly ahead at 5–6 % due to technical complexity and performance-based pricing.