1.white or light yellow crystal powder. 2.Relative density is 1.4. It will become sodium sulfate when exposing in the air.

 

 

ITEM	RESULT
CONTENT	97.01%
INSOLUBLE SUBSTANCE IN WATER	0.05%
IRON	0.003%
PH	4.1
HEAVY METAL(PB)	0.002%
AS	0.0002%
SO2	65.02%
CONCLUSION:IT IS CONFORMITY WITH THE EXPORT STANDARD

SODIUM METABISULPHITE