Pemco Frit P-688 M.P./°F 1550 Silica/Alumina ratio: 11.9:1 Equivalent Molecular Weight: 160.785 Molecular Formula of Pemco Frit P-688: K2O 0.051 Al2O3 0.111 SiO2 1.312 Na2O 0.041 CaO 0.453 MgO 0.171 ZnO 0.172 BaO 0.111 Percentage Analysis 49.00 % SiO2 7.01 % Al2O3 2.99 % K2O 1.60 % Na2O 4.30 % MgO 15.80 % CaO 10.60 % BaO 8.70 % ZnO _____________________ 100 % TOTAL Comments: 8.0 x 10-6 coefficient of thermal expansion (50-450° C) I.F.P. °C = Melting Range °F = 1550-2100