RXSOL Technical Product Bulletin

Sodium Thiosulphate Pentahydrate – Sugar Crystals

Chemical Name: Sodium Thiosulphate Pentahydrate Common Names: Sodium Hyposulphite, Sodium Hypo, Hypo Crystals, Sodium Thiosulfate 5-Hydrate Chemical Formula: Na₂S₂O₃·5H₂O CAS Number: 10102-17-7 Molecular Weight: 248.18 g/mol Product Grade: Industrial / Technical Grade (other grades subject to specification) Physical Form: White to colourless, transparent crystalline granules resembling sugar crystals

Product Description

Sodium Thiosulphate Pentahydrate Sugar Crystals is a highly water-soluble inorganic chemical widely used as a reducing agent, dechlorinating agent, chemical neutralizer and fixing agent in industrial and water treatment applications.

The product consists of colourless to white crystalline particles with a sugar-like appearance. It is particularly effective for removing residual chlorine from water, neutralizing oxidizing agents and supporting various chemical processing operations.

Sodium Thiosulphate Pentahydrate is extensively used in water treatment plants, swimming pool maintenance, textile processing, photographic processing, pulp and paper industries, chemical manufacturing and laboratory applications.

Sodium Thiosulphate Anhydrous manufacturer exporter, supplier. We also keeping Sodium Thiosulphate Anhydrous extrapure AR, 99.5%

Typical Technical Specifications

Note: These are indicative technical values and proposed grade requirements, not certified RXSOL batch results. Final specifications should be confirmed against the approved product specification and Certificate of Analysis.

Applications:

• Textile bleaching neutralization.

• Removal of residual oxidizing chlorine.

• Fabric processing.

• Dyeing and finishing operations.

• Protection of fibres from residual chlorine damage.

We process a white crystalline solid, sodium Thio sulphate anhydrous, which is widely used in chemicals and detergents. Our wide range of sodium Thio sulphate is made of qualitative ingredients to ensure safety and effective use at client's end. These are available with us at industry leading prices and are extensively used in industries.

Dosage

Recommended Dosage for Dechlorination

Theoretical sodium thiosulphate pentahydrate demand depends on the reaction products and operating conditions.

For a commonly used chlorine-to-chloride reaction producing tetrathionate:

The theoretical requirement is approximately 7.0 mg of pure Sodium Thiosulphate Pentahydrate per 1 mg of chlorine expressed as Cl₂.

Further oxidation of thiosulphate to sulphate can result in a different stoichiometric requirement. Consequently, the actual operating dose must be established by testing.

Based on 100% pure pentahydrate and the tetrathionate reaction. These are calculation examples, not universal operating dosages. Verify the required dose through controlled jar testing and residual chlorine measurements.

6. Preparation of Sodium Thiosulphate Solution

For preparing a 10% w/v solution:

1. Fill a clean chemical-resistant mixing vessel with approximately 70% of the required final volume of clean water.

2. Add 100 grams of Sodium Thiosulphate Pentahydrate for each litre of final solution.

3. Stir until all crystals dissolve.

4. Add water to reach the final required volume.

5. Store in a clean, labelled, tightly closed container.

6. Determine the dosing rate from actual chlorine demand and verify the residual chlorine after mixing.

Avoid contamination with acids and strong oxidizing chemicals.

Key Product Features and Advantages

• High water solubility for rapid preparation of aqueous solutions.

• Effective reducing agent for chlorine and selected oxidizing chemicals.

• Convenient crystalline form for storage, weighing and handling.

• Useful for residual chlorine neutralization in water treatment systems.

• Suitable for textile processing and photographic fixing formulations.

• Can be used in chemical manufacturing and analytical laboratories.

• Available in crystalline form for industrial chemical processing.

• Helps protect downstream dechlorination-sensitive processes when properly dosed.

Notes

Industrial Applications

A. Water Treatment and Dechlorination

Sodium Thiosulphate Pentahydrate is widely used to remove residual free chlorine from water.

Applications include:

• Municipal and industrial water treatment.

• Neutralization of chlorinated wastewater before discharge.

• Swimming pool dechlorination.

• Aquarium and aquaculture water preparation.

• Protection of chlorine-sensitive downstream processes.

• Dechlorination of water used for industrial testing.

The product reacts with free chlorine, converting it into chloride under suitable reaction conditions.

B. Reverse Osmosis (RO) Water Treatment

Residual chlorine can damage polyamide RO membranes. Sodium Thiosulphate can be used as a reducing agent for chlorine removal in appropriately designed pretreatment systems.

Benefits:

• Reduces free chlorine residual.

• Helps protect chlorine-sensitive membranes.

• Can support membrane pretreatment operations.

• Provides an alternative dechlorination chemistry where technically approved.

For continuous RO systems, chemical dosing must be controlled through chlorine monitoring and compatibility assessment.

C. Textile and Dyeing Industry

Sodium Thiosulphate is used as an antichlor agent to remove residual chlorine following bleaching operations.

Sodium thiosulfate (sodium thiosulphate) is an inorganic White crystalline solid compound. Also called Sodium thiosulfate pentahydrate, Disodium thiosulfate pentahydrate.

Also used as General bleaching agents, bleaching agents for textiles. And effectively used for cleaning/washing, including cleaning products used in the home, laundry detergents, soaps, de-greasers, spot removers, drycleaning, laundry, soap, window/floor cleaning etc.

D. Pulp and Paper Industry

Used in selected pulp and paper operations for neutralizing residual chlorine-based bleaching chemicals.

It helps prevent unwanted reactions caused by residual oxidants during subsequent processing stages.

E. Photographic Processing

Sodium Thiosulphate is a traditional photographic fixing agent.

It dissolves unexposed silver halides from photographic films and papers by forming soluble silver-thiosulphate complexes.

Applications:

• Black-and-white photographic fixing.

• Photographic paper processing.

• Film development chemicals.

• Silver recovery operations.

F. Chemical Manufacturing

Sodium Thiosulphate is used as a reducing agent and intermediate in selected industrial chemical processes.

Applications include oxidant neutralization, chemical synthesis and controlled redox reactions.

G. Laboratory and Analytical Applications

Sodium Thiosulphate is extensively used in iodometric titration methods.

Applications include:

• Determination of available chlorine.

• Iodine titration.

• Oxidizing agent analysis.

• Chemical quality control.

• Water testing laboratories.

H. Mining and Precious Metal Processing

Sodium Thiosulphate is used in specialized gold and silver leaching processes as a complexing agent.

These processes require carefully controlled chemistry and are not interchangeable with conventional cyanide leaching methods.

Precautions

Quality Control and Testing

Recommended quality checks include:

For reference, commercially published high-purity grades commonly specify assays around 99–101%, depending on the test method and grade.

Industrial area

Frequently Asked Questions

Q1. What is the main use of Sodium Thiosulphate Pentahydrate?

Its principal industrial applications include dechlorination, textile antichlor treatment, photographic fixing and analytical chemical processing.

Q2. Why is it called Sugar Crystals?

The name refers to its transparent to white crystalline appearance, resembling granulated sugar. It is not sugar and is not intended for consumption.

Q3. Can Sodium Thiosulphate remove chlorine from water?

Yes. It chemically reduces free chlorine and is commonly used for dechlorination.

Q4. Is Sodium Thiosulphate Pentahydrate soluble in water?

Yes. It is highly water-soluble, with reported solubility around 701 g/L at 20°C for a reference grade.

Q5. Can it be used in swimming pools?

Yes, for controlled reduction of excessive chlorine residuals. Dosage should be calculated and verified by chlorine testing.

Q6. Is Sodium Thiosulphate Pentahydrate the same as anhydrous Sodium Thiosulphate?

No. Pentahydrate contains five molecules of crystallization water, whereas the anhydrous material does not. Their molecular weights and weight-based dosing requirements differ.

Supply and Industrial Applications

RXSOL Sodium Thiosulphate Pentahydrate Sugar Crystals is suitable for consideration by industrial customers requiring water treatment chemicals, chlorine neutralizers, textile processing chemicals and laboratory reagents.

Commercial enquiries may include supply requirements for Mumbai, Kolkata, Chennai, Gujarat, Dubai, Sharjah, Abu Dhabi, Muscat, Sohar and other industrial markets, subject to availability.

Technical Disclaimer

The specifications, applications and dosing information presented in this bulletin are general technical guidance. Product suitability must be confirmed for the intended process, and actual batch specifications must be supported by the supplier's Certificate of Analysis. Food, pharmaceutical and potable-water uses require the appropriate approved grade and regulatory compliance.

Technical reference: PubChem – Sodium Thiosulfate Pentahydrate.

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Supply location

Sodium Thio sulphate supplier and exporter. We are keeping ready stock of Sodium Thiosulfate and popular supplier in Gandhidham Kandla, Kolkata, Chennai, Ennore, Visakhapatnam, Mumbai, Goa, Fujairah, Sharjah, Dubai, UAE , Muscat Sohar Oman, Nairobi Kenya, Jinja Uganda

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Storage and Handling

• Store in original, tightly closed containers.

• Protect from excessive heat, direct sunlight and moisture.

• Avoid contact with strong acids and oxidizing agents.

• Use suitable gloves, protective clothing and safety glasses.

• Prevent contamination during weighing and transfer.

• Store separately from incompatible chemicals.

• Follow the current product Safety Data Sheet.

Packaging

Sodium Thiosulphate Pentahydrate Sugar Crystals may be supplied in industrial-grade, moisture-resistant bags or other suitable chemical packaging.

Typical commercial packing includes 25 kg bags, subject to supplier confirmation.

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