Specifications

Sodium Cryolite

Assay

98.5%

pH Value

7.5 – 9.0

Fluorine Value as F

54.28%

Aluminium

12.68%

Free HF

0.002%

Silica as SiO2

0.6%

Chloride as Cl

0.003%

Sulphate as SO4

0.004%

Iron as Fe

0.05%

Lead Pb

0.02%

Specific Gravity

2.95 to 3.0.

Molar Mass

209.9 g mol-¹

Molecular Formula

Na₃AlF₆

Appearance

Colorless to white, also brownish, reddish and rarely black, Monoclinic crystals

Melting Point

1012 °C

Solubility

Soluble in AlCl3 solution, soluble in H₂SO₄ with the evolution of HF, which is poisonous.

Solubility in Water

Insoluble in water