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SODIUM METABISULPHITE Extra Pure

Confirming to BP, USP
Sodium pyrosulfite, Sodium disulfite

COAs

Packings

500 g (00500)

1000 g (01000)

5000 g (05000)

25 Kg (0025K)

50 Kg (0050K)

1PW1200500 1PW1200750 1PW1206500 1PDL00030K 1PDL00040K
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Article No. 05935 Grade Extra Pure
Purity 96.5% CAS No. 7681-57-4
Molecular Formula Na2S2O5 Molecular Weight 190.10
H.S. Code 2832.1090 Shelf Life 60 Months

Physical Properties

Physical state at 20 °C Solid Colour White crystalline
Odour Sulphorous pH value 4.5 at 50 g/l at 20 °C
Melting point/ Freezing point [°C] 300 °C Density [g/cm3] 1.48
Solubility in water [% weight] 650 g/l at 20 °C Partition coefficient Log Pow octanol / water at 20°C -3.7

Specifications

Appearance White crystalline powder Assay (iodometric) 96.5 - 100%
Assay (as SO2; iodometric) 65 - 67.4% Identity (acc. to pharmacopoeias) Passes test
pH (5% solution in water) 3.5 - 5.0 Appearance of solution Passes test
Insoluble matter in water Max 0.025% Chloride (Cl) Max 0.02%
Thiosulphate (S2O3) Max 0.05% Heavy metal (as Pb) Max 0.002%
Arsenic (As) Max 0.0004% Iron (Fe) Max 0.002%

Safety Information and Hazard Symbols

Corrosion Exclamation Mark
Symbol: GHS05, GHS07
 Signal Word: Danger
 Hazardous Statement: H302-H318
 Precaution Statement: P280-P305 + P351 + P338
Revision Date: 07-Jun-2022

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