2.Ferro Frit 3124 M.P./°F 1600.0 Silica/Alumina ratio: 9.5:1 Equivalent Molecular Weight: 277.500 Molecular Formula of Ferro Frit 3124: K2O 0.020 Al2O3 0.269 SiO2 2.555 Na2O 0.282 B2O3 0.547 CaO 0.698 Percentage Analysis (wheight %) 55.31 % SiO2 9.90 % Al2O3 0.70 % K2O 6.30 % Na2O 14.10 % CaO 13.70 % B2O3 Formule Molaire % K2O 0,48 % Na2O 6,46 % CaO 15,96 % Al2O3 6,16 % B2O3 12,5 % SiO2 58,45 % Comments: 7.9 x 10-6 coefficient of thermal expansion (50-450° C)