SODIUM METABISULPHITE Extra Pure

Chemical Information
Article No.	AL4195
Grade	Extra Pure
Purity	96.50%
CAS Number	7681-57-4
Molecular Formula	Na2S2O5
Molecular Weight	190.1
HS Code	28321090
Shelf Life	5 Years

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

Safety Information and Hazard Symbols
Signal Word	Danger
Precaution Statement	P280-P305 + P351 + P338
Symbol	GHS05, GHS07
Hazardous Statement	H302-H318

Specifications
Iron (Fe)	Max 0.002%
Heavy metals (as Pb)	Max 0.002%
Arsenic (As)	Max 0.0004%
Chloride (Cl)	Max 0.02%
Appearance	White crystalline powder