Index Superior product First-class product Qualified product
Content 99.90% min 99.50% min 99.0% min
Moisture 200 ppm max 0.10% max 0.15% max
Color (Platinum-Cobalt) 10 20 40
Density (20°C) 1.200±0.005 g/cm3 1.200±0.005 g/cm3 1.200±0.005 g/cm3
Cl 1 ppm max -- --
SO4 1 ppm max -- --
K 1 ppm max -- --
Na 1 ppm max -- --
Ca 1 ppm max -- --
Fe 1 ppm max -- --
Pb 1 ppm max -- --