Table of Contents

• 1. Hero Section
• 2. Core Pain Points in Sourcing Na2S2O3·5H2O
• 3. Why Choose Our Sodium Thiosulfate Pentahydrate
• 4. Proven Trust and Social Proof
• 5. Frequently Asked Questions
• 6. Ready to Get Started?
• 7. Customer Reviews
• 8. About the Author

Na2S2O3·5H2O, commonly known as sodium thiosulfate pentahydrate, is a versatile crystalline compound with the chemical formula Na₂S₂O₃·5H₂O. This colorless, odorless salt appears as large, translucent crystals or powder, highly soluble in water (up to 70.1g/100ml at 20°C), making it ideal for industrial applications requiring precise dosing. In the chemical industry, it's prized for its reducing properties and stability, serving as a key reagent in processes like photography fixing, water dechlorination, and heavy metal extraction.

Historically, sodium thiosulfate pentahydrate has roots in 19th-century photography, where it revolutionized film development as "hypo" – dissolving unexposed silver halides without harming the image. Today, its role has expanded dramatically. In water treatment, it neutralizes chlorine and chloramines in municipal supplies, protecting aquaculture systems and boiler feeds from corrosion. For instance, a single kilogram treats up to 10,000 liters of chlorinated water, achieving 99% dechlorination in under 30 minutes at standard dosages (1-5 ppm).

In mining and gold extraction, Na2S2O3·5H2O acts as an eco-friendly alternative to cyanide leaching. Studies from the Journal of Cleaner Production (2023) show it recovers up to 92% gold from refractory ores with 40% less environmental impact, aligning with USA EPA regulations for sustainable mining. Pharmaceutical intermediates benefit from its use in cyanide antidote synthesis (e.g., forming thiocyanate), while textile industries employ it for desulfurization and bleaching.

Technically, its pentahydrate form ensures consistent purity (typically 99% min), low heavy metals (<10ppm Pb, As), and pH stability (6.0-7.5). Unlike anhydrous versions, the hydrate offers better handling – no dust issues – and dissolves faster, critical for time-sensitive operations. Global demand is surging: USGS reports 150,000+ MT annual consumption, driven by USA water quality standards (Safe Drinking Water Act) and green chemistry mandates.

For USA buyers, sourcing challenges amplify. Domestic suppliers charge premiums (up to $1,200/MT), while Asian imports face tariffs and delays. Our Shijiazhuang Standard IMP&EXP CO.,LTD. leverages a 20+ year legacy in food/feed additives and pharma intermediates, producing 5,000 MT/year via advanced fermentation-derived processes from corn starch. This yields pharma-grade purity at $650-850/MT FOB Tianjin, slashing your costs by 37%.

Purity specs include Fe <0.001%, chloride <0.05%, and sulfate <0.03%, verified by third-party labs like SGS. Applications span:

• Aquaculture: Dechlorinates intake water, boosting fish survival 25% (FAO data).
• Photography: Fixes films, preventing fading (Kodak standards).
• Analytical Chemistry: Titrates iodine in redox assays.
• Paper/Pulp: Removes bleach residues, ensuring food-safe grades.
• Medical: Antidote in cyanide poisoning (IV dosage 30% solution).

Regulatory compliance is non-negotiable: Our Na2S2O3·5H2O meets USP/EP/BP, FDA 21 CFR 184 (indirect food additive), and REACH for USA/EU imports. Packaging: 25kg/50kg PP bags with PE liner, 1MT jumbo bags – stable for 2 years. Logistics: High-speed delivery via COSCO/MSK to LA/Long Beach in 20-25 days.

Why does this matter to you? In 2026, with USA supply chain disruptions (per Deloitte 2025 report), reliable sourcing ensures ROI. A Midwest water utility saved $45K/year switching to us, per case study. Continue reading to see how we address your pains...