Pemco Frit P-626 M.P./°F 1500 Silica/Alumina ratio: 15.5:1 Equivalent Molecular Weight: 371.802 Molecular Formula of Pemco Frit P-626: Na2O 0.336 Al2O3 0.197 SiO2 3.044 BaO 0.664 B2O3 0.664 Percentage Analysis 49.19 % SiO2 5.40 % Al2O3 5.60 % Na2O 27.40 % BaO 12.40 % B2O3 _____________________ 100 % TOTAL Comments: 7.2 x 10-6 coefficient of thermal expansion (50-450° C) Melting range: 1460-1570° F Ferro frit 3289 is a direct substitute.