ITEMS

superior

product

Top quality goods

　　Qualified produc

The content of

 nitrogen ,% ≥

99.9

99.8

99.6

Residue content,%　≤

0.1(gravimetric method)

0.2

0.4

Water ,%　≤

0.1

_

_

The content of water ,mg/kg　 ≤

5(gravimetric method)

2(infrared spectroscopy)

_

_

The content of

 iron , mg/kg　 ≤

1

_

_