Also known as: SMBS, sodium pyrosulphite, E223, Na2S2O5
CAS 7681-57-4Na2S2O5Enquire for availability
Sodium Metabisulphite is a reducing agent and oxygen scavenger used in water treatment, mining and food, supplied to industrial chemicals manufacturers across the GCC.
CAS No.
7681-57-4
Formula
Na2S2O5
Grade
Technical / food grade, 97% min
Packing
25 kg PP bag with PE liner · 1000 kg jumbo bag
Typical response time: within one business day, with price, packing and lead time.
Within our inorganic chemicals range, Sodium Metabisulphite is a reducing agent and oxygen scavenger used in water treatment, mining and food. Orders ship ex-warehouse where stock is held, or direct from origin for container volumes.
It is supplied as white crystalline powder with a faint sulphur odour, in technical / food grade, 97% min, with an assay of 97.0% min (SO2 65% min). The CAS number is 7681-57-4 and the molecular formula is Na2S2O5.
Applications of Sodium Metabisulphite
Typical applications include:
Dechlorination ahead of reverse-osmosis membranes
Oxygen scavenging in oilfield water injection systems
Gold recovery and cyanide destruction in mining
Food preservation and antioxidant (food grade)
Textile and pulp bleaching assistant
Packing, storage and handling
Standard packing is 25 kg PP bag with PE liner · 1000 kg jumbo bag. Store in cool, dry, sealed — oxidises slowly in moist air. Shelf life is 12 months from the date of manufacture when stored as specified.
Supply and documentation
Technical specification for Sodium Metabisulphite
CAS No.
7681-57-4
Formula
Na2S2O5
Appearance
White crystalline powder with a faint sulphur odour
Grade
Technical / food grade, 97% min
Purity / Assay
97.0% min (SO2 65% min)
Assay
97.0% min
SO2 content
65.0% min
Iron
10 ppm max
pH (5% solution)
4.0–5.5
Heavy metals (food grade)
10 ppm max
Packing
25 kg PP bag with PE liner · 1000 kg jumbo bag
Storage
Cool, dry, sealed — oxidises slowly in moist air
Shelf life
12 months
Values are typical for the grade we stock. Please confirm the required specification with our sales team.
Dechlorination ahead of reverse-osmosis membranes
Oxygen scavenging in oilfield water injection systems
Gold recovery and cyanide destruction in mining
Food preservation and antioxidant (food grade)
Textile and pulp bleaching assistant
What packing is Sodium Metabisulphite supplied in?
Sodium Metabisulphite is supplied in 25 kg PP bag with PE liner · 1000 kg jumbo bag. Other pack sizes can be arranged for container quantities — tell us what suits your plant.
Which grade of Sodium Metabisulphite do you stock?
We supply technical / food grade, 97% min. If you work to a different specification, send it across — a large part of what we supply is sourced to the customer's own standard.
Can you deliver Sodium Metabisulphite outside the UAE?
Yes. We ship to Oman, Qatar, Saudi Arabia, Kuwait and Bahrain by road and consolidated container, and to East and West African ports on CIF terms.
