A note to our European Union customers
International shipping is currently disabled due to ongoing issues resulting from Brexit
and changes with customs procedures. Please note, once resumed, international shipments will
be subject to VAT and duties and orders can only be placed in acceptance of this.
Northern Ireland
We will only be able to ship to Northern Ireland where a Royal Mail postal option has been chosen.
Other UK orders are unaffected
Price: £5.78
Stock Availability:
Compare all Pack Sizes
Sodium metabisulfite or sodium pyrosulfite is an inorganic compound of chemical formula Na2S2O5. The substance is sometimes referred to asdisodium (metabisulfite). It is used as a disinfectant, antioxidant and preservative agent.
Minimum Assay: >95% (as Na2S2O5)
Assay as SO2: >64%
Molecular Formula: Na2O5S2
Molecular Weight: 190.10
Melting Point: >300 deg C
pH (10% Sol): 4.0- 5.5
Arsenic (As): <3mg/Kg
Iron (Fe): <30mg/Kg
Mercury (Hg): <1mg/Kg
Lead (Pb): <5mg/Kg
Selenium (Se): <6mg/Kg
Heavy Metals (as Pb): <10mg/Kg
Certified Food Grade
Conforms to Commission Directive 2008/84/EC (E223)
Hazard Phrases: Causes serious eye damage. Harmful if swallowed. Contact with acids liberates toxic gas.
Prec Phrases: Wear protective gloves/protective clothing/eye protection/face protection.
We can also accept a bank transfer (UK Only)