Pemco Frit P-878 M.P./°F 1500 Equivalent Molecular Weight: 261.140 Molecular Formula of Pemco Frit P-878: Na2O 0.320 B2O3 0.639 SiO2 1.879 CaO 0.680 ZrO2 0.373 Percentage Analysis 43.21 % SiO2 7.60 % Na2O 14.60 % CaO 17.00 % B2O3 17.60 % ZrO2 _____________________ 100 % TOTAL Comments: 7.9 x 10-6 coefficient of thermal expansion (50-450° C) I.F.P. °C = 650 Melting Range °F = 1500-1590