Appearance (Colour)
White
Appearance (Form)
Crystalline powder
Solubility (Turbidity) 2.5% hot aq. solution
Clear
Solubility (Colour) 2.5% hot aq. solution
Colourless
Assay
min. 99%
Loss on drying
max. 0.2%
Acidity (HF)
max. 0.05%
Sulphate (SO4)
max. 0.01%
Iron (Fe)
max. 0.002%
Heavy Metals (Pb)
max. 0.001%
Copper (Cu)
max. 0.0005%
Sulphite (SO3)
max. 0.005%
Fluorosilicate (SiF6)
max. 0.1%