Ammonium hexafluorosilicate - colorless crystals, decompose higher 175°C.
Interaction of H2SiF6 with NH3;
Bubbling of SiF4 containing in waste gases of superphosphate manufacturing through NH4F solutions with following crystallization.
White black (SiO2 with high surface area) production by gel from reaction below ignition.
(NH4)2SiF6 + 4NH3 + (n+2)H2O --> 6NH4F + SiO2*nH2O
Ammonium hexafluorosilicate is an intermediate product in production of NH2HF2, NH4F, CaF2, NaHF2 and other fluorides.
Component for glass etching.