CAS No 7681-57-4
EC No. 231-673-0
Molecular formula Na₂S₂O₅
Molecular Weight 190.11
Synonym Sodium metabisulphite, Hi-AR®/ACS
HS Code 2832 10 90
Storage Below 30°C
Shelf Life 4 Years
Appearance White to off-white crystals or powder or solid or chunks
Solubility 100 mg soluble in 1 mL of water
pH (5% in water at 25°C) 3.5 - 5.0
Chloride (Cl) <= 0.05%
Heavy metals (as Pb) <= 0.001%
Insoluble matter <= 0.005%
Iron (Fe) <= 0.002%
Thiosulfate (S₂O₃) <= 0.05%
Assay (Iodometry) 98.00 - 103.00%
Signal Word Danger
Hazard Statements H302- H318
Precautionary Statements P270- P280- P305+P351+P338- P310- P330- P501
UN. No. Not dangerous goods
Class -
Packing Group -
RTECS UX8225000
WGK 1
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