white small granule or powder. odorless or with slight odor of  benzoin

Index name	Food grade GB1902-94	Pharmaceutical gradeBP98
Assay(dry)	≥99.0%	99.0-100.5%
Loss on dry	≤1.5%	≤2.0%
Appearance of solution	meet the standard	meet the standard
PH	passed	passed
Chloride	≤0.05%	≤0.02%
Compound caontaining chlorine gas	/	≤0.03%
Heavy metals	≤0.01%	≤0.001%
As	≤0.0002%	≤0.0002%
Sulfate	/	≤0.1%