Appearance: white to off-white crystal powder
      Melting Point:  ≥ 300℃
      Assay:  ≥ 99 %
      Residue on ignition:  ≤ 0.5%
      Heavy metals( ppm ) :  ≤ 10

Storage & transportation:

      Store at a dry, light-free place, below 25 ℃