Index name Index Grade Super grade Top grade First grade Second grade Chroma 20 20 30 70 Assay % 99.5 98.5 98.0 95.0 Density20centigradeg/m 1.2598 1.2572 1.2559 1.2481 Chloride Assay 0.001 0.001 0.01 0.05 Sulfating Ash (%) 0.01 0.01 0.01 0.01 Acidity or Alkalinity (mmol/100g) 0.064 0.064 0.1 0.3 Saponification equivalent (mmol/100g) 0.64 0.64 1.0 3.0 Heavy metals Assay (as Pb, mg/kg 5 5 5 5 As (as As, mg/kg) 2 2 2 2
