Closed loop corrosion inhibitors are specialized chemical compounds used in sealed heating and cooling systems, such as HVAC circuits, power plant loops, and industrial heat exchangers. The production of these inhibitors typically involves blending various chemicals—such as nitrites, molybdates, amines, phosphates, and polymers—into formulations that offer long-term protection against corrosion, scale, and microbial fouling. Prices for closed loop corrosion inhibitors are moderately stable, with annual price growth typically aligned with inflation or slight increases in raw material costs. Price volatility is low compared to bulk chemicals, due to the specialty nature of the products and the contractual, long-term supply arrangements commonly in place.