Ammonium silico fluoride - (NH4)2SiF6 , F.W. 178.15

Properties
Decomp. Temp : 120⁰C
Density : 2.011 g/cm3 (20⁰C)
Solubility in water : 555 g/L
Refractive Index : 1.3682
PH : 3.3 (1% Sol.)
Stability : Stable under ord.cond

Specification
Assay (NH₄)2SiF₆ : 98.0% Min.
Fluoride (F) : 60% Min.
Free Acid (H₂SiF₆) : 0.3% Max.
Moisture : 0.6% Max.
Water Insolubles : 0.5% Max.
Sulfate (SO₄) : 0.6% Max.