Appearance: White or offer white crystalline powder

Assay: 98.0%～102.0%

Identification:

   1) IR Absorption - As per reference standard

   2) UV Absorption - Do not differ by more than 3% at 272nm

Loss on drying: 1.0% max.

Specific rotation: -15.3° ～-17.0°

Heavy metals: 0.002% max.

Free naproxen: 1.0% max.

Residual Solvent Acetone: 0.5% max.

Chromatographic purity

   1)Any single impurity: 0.5%max.

   2)Total impurities: 2.0% max.

Packing: 25kg/ fibre drum

Storage:  kept at cool, shadow place

Shelf life: 3 years under proper storage