Appearance: Grey-white powder

Purity(HPLC): 98.5%min.

Content (341 ) : 85% min.

Content (319 ) : 80% min.

Chromotropic acid: 0.5% max.

W acid: 0.15%max.

T acid: 0.25%max.

K acid: 0.05%max.

Total organic insoluble matter:  1.5% max.

Alkali insoluble matter: 0.1% max.

Packing: 25kg /bag