|
Appearance
|
A white powder
|
|
Assay
|
Min 99%
|
|
Insoluble matter
|
Max 0.01%
|
|
Loss on drying (at 150°C)
|
Max 0.2%
|
|
Acidity (as HF)
|
Max 0.05%
|
|
Free alkali
|
Max 0.04%
|
|
Chloride (Cl)
|
Max 0.005%
|
|
Hexafluorosilicate (SiF6)
|
Max 0.1%
|
|
Sulphate (SO4)
|
Max 0.01%
|
|
Sulphite (as SO3)
|
Max 0.005%
|
|
Heavy metal (as Pb)
|
Max 0.001%
|
|
Calcium (Ca)
|
Max 0.004%
|
|
Iron (Fe)
|
Max 0.002%
|
|
Lead (Pb)
|
Max 0.0005%
|