24.Ferro Frit 3289 M.P./°F 1500 Silica/Alumina ratio: 15.5:1 Equivalent Molecular Weight: 374.127 Molecular Formula of Ferro Frit 3289: Na2O 0.332 Al2O3 0.198 SiO2 3.070 BaO 0.668 B2O3 0.668 Percentage Analysis 49.30 % SiO2 5.40 % Al2O3 5.50 % Na2O 27.40 % BaO 12.40 % B2O3 _____________________ 100 % TOTAL Comments: 8.2 x 10-6 coefficient of thermal expansion (50-450° C)