25.Ferro Frit 3291 Silica/Alumina ratio: Equivalent Molecular Weight: 332.184 Molecular Formula of Ferro Frit 3291: CaO 0.123 Al2O3 0.430 SiO2 2.510 MgO 0.877 B2O3 1.373 Percentage Analysis 45.38 % SiO2 13.20 % Al2O3 10.64 % MgO 2.08 % CaO 28.70 % B2O3 _____________________ 100 % TOTAL Comments: 3.9 x 10-6 coefficient of expansion (50-450° C)