The global calcium phosphite market was estimated at USD 450 million in 2024 and is expected to reach USD 750 million by 2033, at a CAGR of 6.5% from 2026 to 2033, according to Verified Market Reports. Calcium phosphite is an inorganic compound used as a flame-retardant, stabilizer, corrosion inhibitor and agricultural nutrient in industrial and specialty applications.

Calcium phosphite serves as a flame-retardant and synergistic stabilizer in plastics and coatings, as a corrosion inhibitor and metal-treatment additive, and in agricultural and water-treatment applications. Demand is tied to the expansion of flame retardants and specialty additives, the growth of sustainable phosphorus chemistry, and the rising use of phosphites in industrial formulations. Asia-Pacific is the largest and fastest-growing region, supported by extensive plastics and chemical industries in China, India and Southeast Asia.

North America and Europe sustain steady demand in premium flame-retardant and specialty applications. Continued phosphorus-chemistry growth positions calcium phosphite as a steadily advancing functional additive.