|
Appearance
|
Reddish brown powder
|
|
Assay
|
Min 99.7%
|
|
Substance insoluble in HNO3
|
Max 0.02%
|
|
Phosphorous (P)
|
Max 0.001%
|
|
Antimony (Sb)
|
Max 0.001%
|
|
Arsenic (As)
|
Max 0.0001%
|
|
Lead (Pb)
|
Max 0.01%
|
|
Iron (Fe)
|
Max 0.005%
|
|
Manganese (Mn)
|
Max 0.001%
|
|
Silver (Ag)
|
Max 0.002%
|
|
Tin (Sn)
|
Max 0.001%
|