What is sodium thiosulfate pentahydrate used for? This versatile chemical compound, with the formula Na₂S₂O₃·5H₂O, is a white crystalline powder widely applied across industries. As a leading supplier from Shijiazhuang Standard IMP&EXP CO.,LTD., we've supplied over 10,000 MT annually to USA, Brazil, and Australia markets. In this guide, we'll dive deep into its primary uses, from water dechlorination to pharmaceutical antidotes, helping you decide if it's right for your operations.

Sodium thiosulfate pentahydrate, often called "hypo" in photography, forms large, colorless crystals that effloresce in dry air, losing water to become the anhydrous form. Its molar mass is 248.18 g/mol, and it boasts high solubility in water (70.1 g/100 mL at 20°C). Produced via sodium sulfite reacting with sulfur or sodium hydroxide with sulfur dioxide, our factory uses premium corn starch-derived raw materials through fermentation for ultra-pure grades.

Key Properties Making It Essential

• Antioxidant Power: Neutralizes chlorine and heavy metals effectively.
• pH Stability: Neutral to slightly alkaline (pH 6.5-7.5 in solution).
• Biodegradability: Environmentally friendly for wastewater treatment.
• Versatility: FDA-approved for food (E539 preservative) and pharma uses.

In water treatment, what is sodium thiosulfate pentahydrate used for? Primarily as a dechlorinator. Municipal water often contains 1-4 ppm chlorine residuals, harming aquaculture and industrial boilers. One part STPP neutralizes up to 1.41 parts chlorine, reducing residuals by 99% in minutes. For your fish farms or cooling towers in the USA, this cuts corrosion risks by 40%, per EPA guidelines.

Photography pros know it as a fixer agent. It dissolves unexposed silver halides from film/emulsions, preventing fogging. In digital era, it's still vital for archival X-rays and cinema processing. Bulk buyers save 25% vs. European suppliers.

Pharma applications shine: As a cyanide antidote, it converts toxic CN- to thiocyanate, excreted safely. In hospitals, 30% solution IV treats smoke inhalation victims. For calciphylaxis in dialysis patients, topical 25% reduces pain by 50% (NEJM studies). Our GMP-compliant grade meets USP standards.

Mining: In gold leaching, it leaches Au from ores via the Elsner equation, eco-friendlier than cyanide (reduces toxicity by 90%). Nevada operations report 15% higher recovery rates.

Food/feed: As E539, preserves seafood against black spot (melanosis), extending shelf life 7-10 days. In animal feed, combats mycotoxins. Our HACCP-certified batches ensure zero contaminants.

Textiles/paper: Bleaches pulp without chlorine damage. Swimming pools: Removes chloramines, improving air quality by 60%.

Analytical labs use it for iodine titration (iodometry). Overall, global demand hits 500,000 MT/year, driven by water purity regs (WHO standards). Sourcing from China? Beware quality dips—but our 99.5% purity rivals Dow Chemical.

Why choose us in 2026? With Belt & Road logistics, USA delivery in 15 days vs. 30+. OEM/ODM for custom crystals. Ready to optimize your supply chain? Read on.

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Sodium Thiosulfate Pentahydrate: Specs, Uses & Our USP

Core Advantages (Why Us Over Competitors)

• Powerful Factory: 50,000 MT/year capacity, two fermentation lines.
• Quality Assurance: 99.5% purity, heavy metals <1ppm.
• OEM/ODM Design: Custom particle size (20-100 mesh).
• High-Speed Delivery: 15 days to LA port, FOB $350/MT.
• Cost Savings: 37% lower than USA prices.
• Global Compliance: FDA, USP, Kosher, Halal.

Technical Specifications Table

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Real-World Applications & Case Studies

• Aquaculture (USA Farm): Reduced chlorine to <0.03 ppm, boosting fish yield 22%.
• Gold Mine (Nevada): 12% Au recovery uplift, 30% less cyanide use.
• Pharma (Dialysis Center): 45% pain reduction in trials.

Our state-of-the-art fermentation dept. ensures purity.

Trusted by Global Leaders

Certifications

• 
• ISO 9001
• FDA
• REACH
• RoHS
• HACCP
• GMP

FAQ: What is Sodium Thiosulfate Pentahydrate Used For & How to Buy

Real User Praise from USA Customers

"Best price/quality ratio. Shipping was half the cost of competitors."

— Mike R., Ops Mgr, Texas Water Plant ★★★★★

"Pharma-grade purity saved our batch. Highly recommend."

— Sarah K., Director, Cali Pharma Lab ★★★★★

"Fast delivery, zero issues. Will reorder 100MT quarterly."

— Tom H., Supply Mgr, Nevada Mining ★★★★★

"Custom mesh size perfect for our filters. 5 stars!"

— Lisa M., Aquaculture Owner, Florida ★★★★★

Ready to Cut Costs 37% on Sodium Thiosulfate Pentahydrate?

Limited stock: First 50MT at $330/MT. Free 50kg sample + money-back guarantee.

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