|
Appearance
|
Brown to black powder
|
|
Assay
|
Min 97%
|
|
Dilute nitric acid insoluble matter
|
Max 0.2%
|
|
Carbon compounds (C)
|
Max 0.04%
|
|
Chloride (Cl)
|
Max 0.002%
|
|
Nitrate (NO3)
|
Max 0.02%
|
|
Sulphate (SO4)
|
Max 0.05%
|
|
Calcium (Ca)
|
Max 0.02%
|
|
Copper (Cu)
|
Max 0.05%
|
|
Iron (Fe)
|
Max 0.02%
|
|
Manganese (Mn)
|
Max 0.0005%
|
|
Potassium (K)
|
Max 0.05%
|
|
Sodium (Na)
|
Max 0.1%
|