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Items

Grade

Premium

First Grade

Qualified

Potassium Oxide（K₂O）%     ≥

46.0

44.5

44.0

Nitrogen（Ｎ）%　               ≥

13.5

13.5

13.0

Chloride（Cl^-) %                    ≤

0.2

1.2

1.5

Moisture（H₂O）%               ≤

0.5

1.0

1.5

Water Insoluble%                  ≤

0.10

0.20

0.30

Particle Size d/%

1.00mm-4.75mm   ≥

90

 Smaller than 1.00mm     ≤

3

As %   ≤

0.0050

Cr%   ≤

0.0010

Pb%   ≤

0.0200

Cd%   ≤

0.0500

Hg%   ≤

0.0005

The particle size of crystalline products is not specified. The particle size of the granular product is also available according to the specifications agreed by the supply and demand parties.