Sodium Hyaluronate Appearence: White powder,100 mesh with characteristic odor PH Acidity: 5.0-7.0 Heavy Metals:<20ppm Arsenic:<2ppm Protein:<1.0% Loss on Drying:<10.0% Ash: 15.0-20.0% Hyaluronic Acid:>90% Total Bacterial Count:<500CFU/g E.Coli:Negative Guarantee Period: 2 years