Warfarin Sodium 

PH:  7.2 to 8.3 (1 in 100solution)

Water: less than 0.3%

Heavy metals:  less than 10ppm

Absorbance in alkaline solution:     less than 0.1

Chromatographic purity Individual known impurity less than 0.3%

Individual unknown impurity less than 0.1%

Total impurity: less than 1.0%

Isopropyl alcohol content      : 8.0%~8.5%

Organic volatile impurity       : Comply the USP requirements

Residual solvents    Ethanol less than 1000ppm

Acetone: less than 1000ppm

Assay (on the anhydrous isopropyl alcohol-free basis) :97.0-102.0%