18.Ferro Frit 3264 M.P./°F 1400 Silica/Alumina ratio: 12.9:1 Equivalent Molecular Weight: 291.087 Molecular Formula of Ferro Frit 3264: Na2O 0.984 Al2O3 0.192 SiO2 2.470 CaO 0.005 B2O3 0.885 MgO 0.011 Percentage Analysis 50.96 % SiO2 6.72 % Al2O3 20.95 % Na2O 0.15 % MgO 0.10 % CaO 21.11 % B2O3 _____________________ 100 % TOTAL Comments: 11.0 x 10-6 coefficient of expansion (50-450° C)