CAS 7681-57-4
Sodium Metabisulphite
CAS 7681-57-4Na2S2O5190.11 g/mol
Sodium Metabisulphite, CAS 7681-57-4, is primarily used in water treatment to dechlorinate water, removing residual chlorine before discharge or further processing. This versatile compound is a white to slightly yellow crystalline powder with a faint SO2 odor when moist, making it suitable for diverse applications. Industries across Kenya and East Africa rely on Sodium Metabisulphite in water treatment, food processing, textile manufacturing, mining, and pharmaceuticals for its antioxidant, preservative, and reducing agent properties. Available in technical and food grades, it meets the regional demands with ≥97% purity, ensuring effective results.
Main applicationWater treatment — Chlorine removal and RO membrane protection
Sodium Metabisulphite is significant in East African industries for its effectiveness as a reducing agent and preservative. It enables crucial processes like water dechlorination and mineral processing, which are essential for safe water supply and resource extraction. Its role in food preservation and textile processing underscores its versatility and demand across sectors. This makes it an invaluable component for industries seeking cost-effective and reliable chemical solutions.
Also known as
- Sodium pyrosulfite
- Disodium metabisulfite
- E223
Trade pricing
Quoted per enquiry
Pricing depends on volume, grade and delivery point. Our desk responds within two working hours.
Available packaging
- Available in 25 kg bags
- suitable for bulk supply.
Documentation
Batch-specific COA issued with every consignment.
Technical specifications
- CAS number
- 7681-57-4
- Chemical formula
- Na2S2O5
- Molecular weight
- 190.11 g/mol
- Grade
- Technical grade
- Appearance
- White to slightly yellow crystalline powder
- Density
- 1.48 g/cm³
- pH
- ~4-5
- Concentration
- ≥97%
- Melting Point
- ~150 °C
- Solubility in Water
- Soluble
Sodium Metabisulphite (Na2S2O5) serves as an effective reducing agent, commonly utilized in processes like dechlorination and mineral flotation. Its appearance as a white to slightly yellow crystalline powder facilitates easy handling. Technical-grade Sodium Metabisulphite boasts an assay of 99.5-100.5%, ideal for industrial applications. Buyers may also opt for food and pharma grades, maintaining comparable purity levels with minimum Na2S2O5 content at 97.2%. Choosing the appropriate grade ensures compatibility with specific industrial processes, whether for water treatment or food preservation. Packaging in 25 kg bags offers convenient, bulk supply options.
Delivery
Sodium Metabisulphite is dispatched from our Nairobi warehouse across Kenya, and export delivery is arranged to the wider East African market. Lead time depends on quantity and grade and is confirmed with your quotation — see delivery and collection for the towns we reach and how dispatch works.
Applications & uses
- Water treatment — Chlorine removal and RO membrane protection
- Food and beverage — Preservative and antioxidant
- Mining — Mineral flotation and cyanide detoxification
- Textile and leather — Bleaching aid and reducing agent
- Pharmaceutical — Antioxidant and sterilization processes
- Chemical manufacturing — Reducing agent and pulp bleaching
- Photography — Preservative in developing baths
Industries we supply this to
Why buy this from Sparks
- Effectively dechlorinates water for safer discharge
- Prevents browning in food and beverages, extending shelf life
- Enhances ore processing efficiency in mining
- Improves colorfastness and quality in textiles
- Facilitates chemical synthesis with reducing properties
- Provides reliable preservation in photography
Quality assurance
- Batches are checked against the specification values listed above before dispatch.
State what your process, auditor or customs clearance requires when you request a quotation, and it is confirmed with the quote.
Safety, handling & storage
Always consult the full Safety Data Sheet before handling. Personnel must use appropriate PPE and follow local regulations for storage, transport and disposal.
Frequently asked questions
What is the CAS number of Sodium Metabisulphite?
The CAS registry number for Sodium Metabisulphite is 7681-57-4. Its chemical formula is Na2S2O5, with a molecular weight of 190.11 g/mol. Quote this number when requesting a quotation or checking documentation, as it identifies the substance unambiguously regardless of the trade name used.
What are the other names for Sodium Metabisulphite?
Sodium Metabisulphite is also referred to as Sodium pyrosulfite, Disodium metabisulfite and E223. These names describe the same substance, so a specification or enquiry written against any of them can be matched to this product.
What grade of Sodium Metabisulphite is supplied?
Sodium Metabisulphite is supplied as Technical grade. State the grade your process requires when requesting a quotation — where an alternative grade can be sourced, it is confirmed at quotation stage rather than assumed.
What concentration is Sodium Metabisulphite supplied at?
Sodium Metabisulphite is supplied at a concentration of ≥97%. Concentration and assay are separate figures: the concentration describes the strength of the material as supplied, and the certificate of analysis issued for your consignment carries the measured values for that batch.
What does Sodium Metabisulphite look like?
Sodium Metabisulphite is described as white to slightly yellow crystalline powder. Appearance is a useful first check on receipt of goods, though it does not replace the certificate of analysis for confirming that the material meets specification.
What is Sodium Metabisulphite used for?
Common applications include water treatment — Chlorine removal and RO membrane protection, food and beverage — Preservative and antioxidant, mining — Mineral flotation and cyanide detoxification, textile and leather — Bleaching aid and reducing agent, pharmaceutical — Antioxidant and sterilization processes and chemical manufacturing — Reducing agent and pulp bleaching. The suitability of the product for a particular process depends on the grade and specification required, which is worth confirming against your own process conditions.
Which industries use Sodium Metabisulphite?
Sodium Metabisulphite is supplied to the Water Treatment, Food Processing & Beverage, Mining & Minerals, Pharmaceuticals & Healthcare and Textile & Leather Tanning sectors. These are the industries this product is listed against in our catalogue; if your application falls outside them, we can advise on suitability before you order.
What packaging is Sodium Metabisulphite available in?
Available in 25 kg bags, suitable for bulk supply. Where a different pack size or bulk delivery is required, it is confirmed at quotation stage against availability rather than listed here as standard.
What is the HS code for Sodium Metabisulphite?
Sodium Metabisulphite is recorded against the EC number 231-673-0 and the HS customs code 2832 10 00. Quote this on customs and export paperwork; it is confirmed again on the commercial invoice for your specific consignment.
References
Technical information on this page was compiled from the following published sources. Safety and handling data always comes from the supplier’s own safety data sheet.
- 1.SODIUM METABISULFITE | Occupational Safety and Health Administrationosha.gov
- 2.G05_SDS_Sodium_Metabisuphite_Food_EN01norwest.cz
- 3.Sodium metabisulfitewebbook.nist.gov
- 4.Sodium Metabisulfite - Technical Grade — Sample Certificate of Analysis | Alliance Chemicaldocs.alliancechemical.com
- 5.Sodium metabisulfite ACS reagent, = 97.0 7681-57-4sigmaaldrich.com
- 6.Caa NDSFG e Rev5 | PDF | Chemical Substances | Chemistryes.scribd.com
- 7.Product Specificationassets.thermofisher.com
- 8.Sodium Metabisulphite in Kenya - Sanvil Industries Ltdsanvilindustries.com
- 9.Sodium Metabisulfite - Axiom Water Technologiesaxiomwatertechnologies.co.ke
- 10.Sodium Metabisulphite in Kenya - System Star Industrial Productssystemstarindustrial.com
- 11.Sodium Metabisulfite Supplier in Kenya, Uganda, Tanzania and Rwanda | Zenco Systems Ltd - Chemical Divisionzencochemicals.com
- 12.Buy Sodium Metabisulfite in Kenya, Uganda, Tanzania & Rwanda | Finstarfinstarindustrialchemicals.com
- 13.Sodium Metabisulphite stripped away colour?reddit.com
- 14.Help with etching using SMBreddit.com
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