Sodium metabisulfite

Synonyms: Sodium disulfite, Sodium pyrosulfite, Disulfite, Pyrosulfite

Grade: ACS,Reag. Ph Eur

Chemical Formula: Na₂O₅S₂

Molar Mass: 190.11 g/mol

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Catalogue Number106528
SynonymsSodium metabisulfite, Sodium pyrosulfite, Disulfite, Pyrosulfite
Product Information
CAS number7681-57-4
EC index number016-063-00-2
EC number231-673-0
GradeACS,Reag. Ph Eur
Hill FormulaNa₂O₅S₂
Molar Mass190.11 g/mol
HS Code2832 10 00
Quality LevelMQ300
Physicochemical Information
Density2.36 g/cm3 (20 °C)
Melting Point150 °C (decomposition)
pH value3.5 – 5 (50 g/l, H₂O, 20 °C)
Bulk density1000 – 1200 kg/m3
Solubility650 g/l
Toxicological Information
LD 50 oralLD50 Rat 1540 mg/kg
LD 50 dermalLD50 Rat > 2000 mg/kg
Safety Information according to GHS
Hazard Pictogram(s)Hazard Pictogram(s)Hazard Pictogram(s)
Hazard Pictogram(s)Hazard Pictogram(s)
Hazard Statement(s)H302: Harmful if swallowed.
H318: Causes serious eye damage.
EUH031: Contact with acids liberates toxic gas.
Precautionary Statement(s)P280: Wear eye protection.
P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P313: Get medical advice/ attention.
Signal WordDanger
Storage class10 – 13 Other liquids and solids
WGKWGK 1 slightly hazardous to water
Sulfides and sulfites as well as other reducing substances, inorganic cyanides and isonitriles: Stir into sodium hypochlorite solution (Cat. No. 105614) and, if necessary, leave to react for several days. Caution: some substances may show a violent reaction! Draw off any toxic or flammable gases that may be formed. Excess oxidant should be neutralized with sodium thiosulfate (Cat. No. 106513). Container D or E.
Safety Information
Hazard SymbolsHazard SymbolsHazard SymbolsHarmful
Categories of dangerharmful, irritant
R PhraseR 22-31-41
Harmful if swallowed.Contact with acids liberates toxic gas.Risk of serious damage to eyes.
S PhraseS 26-39-46
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear eye/face protection.If swallowed, seek medical advice immediately and show this container or label.
Storage Information
StorageStore at +5°C to +30°C.

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