Index name Index 
Grade Super grade 
Chroma ≤ 20 
Assay % ≥ 99.5 
Density (20C g/ml ≥ 1.2598 
Chloride Assay (as Cl, %)≤ 0.001 
Sulfating Ash (%) ≤ 0.01 
Acidity or Alkalinity (mmol/100g)≤ 0.064 
Saponification equivalent (mmol/100g) ≤ 0.64 
Heavy metals Assay (as Pb, mg/kg)≤ 5 
As (as As, mg/kg)≤ 2