Appearance: White or off-white crystalline powder
Assay (HPLC): 95-102%
Acidity: 3.5-5.0
Specific optical rotation: -48°~ -58°
Sulfates: 0.05%max

Related substances: 
   Narrow isomer: 0.5%max
   Cis-and trans-isomers: 0.5%max 
   Unknown monomer: 1.5%max
   Total impurities: 5.0%max

Residue on ignition: 0.2%max
Loss on drying:  2.0%max
Heavy metals: < 20ppm

Package: 25kg/fibre drum

Certification: DMF OPEN PART, ISO9001:2008, ISO14001:2004