... 2826300000 Synthetic CryoliteSpecification: Quality standardGB/4291-1999GradeChemical compositions %FALNaSiO2Fe2O3S04P2O5H02Ignition (550°C) Min.Max.Special grade (A)5313320.250.050.70.020 ... 3.01g/cm3, melting point about 1000°C, specific heat 1.056j/g°C at 18—100°C. It’s slightly soluble in water ... dehydrates, the loss on ignition at 800°C will appear 10.34%, 6.22% and 2.56% when the molecular ratio ...