Item

Specification

First grade

Qualified grade

particle size(d 0.85~2.8mm)(%)

(d 1.18~3.35mm)(%)

95

90

T-nitrogen (%)

≥46.5

≥46.3

moisture(%)

≤0.3

≤0.4

biuret(%)

≤0.8

≤0.9

alkalinity(NH3) (%)

≤0.05

≤0.1

Aldehyde (mg/kg)             

≤10

≤15

Insoluble matter(mg/kg)  

≤20

≤60

PO4(mg/kg)                                   

≤0.3

≤1.0

Ca (mg/kg)           

≤0.3

≤1.0

Fe (mg/kg)

≤1.0

≤1.0

Cu(mg/kg)

≤0.3

≤0.5

Zn (mg/kg)

≤0.3

≤0.5

Ni(mg/kg)

≤0.3

≤0.5

Cr(mg/kg)

≤0.3

≤0.5

Mg(mg/kg)

≤0.3

≤1.0

Na(mg/kg)

≤0.3

≤1.0

K(mg/kg)

≤0.3

≤1.0

Al(mg/kg)

≤0.3

≤1.0