Pemco Frit P-238 M.P./°F 1450.0 Silica/Alumina ratio: 4.3:1 Equivalent Molecular Weight: 670.728 Molecular Formula of Pemco Frit P-238: K2O 0.221 Al2O3 1.086 SiO2 4.635 Na2O 0.779 B2O3 3.062 Percentage Analysis 41.50 % SiO2 16.50 % Al2O3 3.10 % K2O 7.20 % Na2O 31.70 % B2O3 _____________________ 100 % TOTAL Comments: 7.6 x 10-6 coefficient of thermal expansion (50-450° C) I.F.P. °C = 535 Melting Range °F = 1450-1560