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