Best    quality

First    quality

Qualified    quality

Content of    Sodium nitratecalculated    by dry base)     

% =

99.7

99.3

98.5

Content of    Sodium nitrite(calculated    by dry base)       

%=

0.01

0.02

0.15

Content of    Chloride (NaCl) (calculated    by dry base)     

%=

0.25

0.30

___

Content of    insolubles in water(calculated    by dry base)        

%=

0.03

0.06

___

Moisture                     

%=

1.0

1.5

2.0

Content of    Sodium carbonate(calculated    by dry base)      

%=

0.05

0.10

___

Content of    iron(Fe)           

%=

0.005

___