Item

Spec.

Result(super grade)

Result(qualified grade)

Assay:

98.0%-99.5%

99.23%

99.12%

Melting point:

286 -289℃

287℃

287℃

moisture:

0.5% - 1.0%

0.37%

0.43%

Ash content:

0.05% - 0.2%

0.045%

0.06%

Colour and lustre

30-50

32

36

Total acid

99.5% Min

Sulphate

0.01% Max

AHPA

(5% alcohol) 20 Max

As

3ppm Max

Melting point

287℃ Min

Water

0.25% Max

Heavy metal (as Pb)

10ppm Max

Ash content

0.05% Max