SODIUM METABISULPHITE LR

Article No.	Grade	Purity	Cas no.	Molecular Formula	Molecular Weight	H.S. Code	Shelf Life
S0189200500	LR	96.5%	7681-57-4	Na₂S₂O₅	190.10	2832.1090	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

Partition coefficient Log Pow octanol / water at 20°C

-3.7

Density [g/cm3]

1.48

Solubility in water [% weight]

650 g/l at 20 °C

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

Symbol: GHS05, GHS07
Signal Word: Danger
Hazardous Statement: H302-H318
Precaution Statement: P280-P305 + P351 + P338