Sodium Thiosulfate Manufacturing Plant Project Report 2026: Cost Analysis, ROI, and Feasibility Insights

The benchmark plant capacity is 8,000 to 12,000 MT/year of 99% pentahydrate.

The global sodium thiosulfate market size is expected to be around USD 115 million to USD 140 million, with a projected compound annual growth rate (CAGR) of 5.0% to 5.5%.

Water treatment accounts for 35% to 40% of demand; photography and photofinishing represent 15% to 20%; gold and silver leaching accounts for 10% to 15%; and textile mordant, food antioxidant (E539), medical antidote, and analytical reagent uses constitute the remaining 25% to 35%.

The manufacturing process follows the sulfite sulfur route, in which sodium sulfite is reacted with elemental sulfur in a boiling aqueous solution at about 80 to 100 degree Celsius under reflux. The resulting sodium thiosulfate solution is filtered, concentrated, crystallized, separated, and dried to obtain the required grade.

Sodium sulfite and elemental sulfur together represent 70% to 85% of total raw material expense. Water and other processing materials are also required depending on the production route and final grade.

Major process equipment, including reactors, evaporators, crystallizers, centrifuges, and drying and packaging systems, represents 40% to 50% of the total sodium thiosulfate plant setup cost.

Production economics are mainly influenced by the prices of sodium sulfite feedstock and elemental sulfur. Other cost factors include energy consumption for heating, evaporation and drying, crystallization losses, labor, packaging, wastewater treatment, maintenance, and plant utilization.

Major producing regions include China, Italy, Germany, India, Japan, and the United States. China has a strong manufacturing base, while India, Japan, Europe, and the United States also supply industrial- and pharmaceutical-grade material.

Available specifications include crystalline pentahydrate, anhydrous powder, 99% pentahydrate, technical grade, photographic grade, analytical grade, and pharmaceutical-grade material. Pharmaceutical sodium thiosulfate is available as sodium thiosulfate pentahydrate and is used in sterile injectable formulations, where specifications cover identity, purity, strength, sterility, appearance, and other applicable quality parameters.