Pemco Frit Pb-742 Cost/lb: $1.00 M.P./°F 1400 Silica/Alumina ratio: 21.5:1 Equivalent Molecular Weight: 355.500 Molecular Formula of Pemco Frit Pb-742: Na2O 0.210 Al2O3 0.121 SiO2 2.589 CaO 0.289 B2O3 0.670 PbO 0.501 Percentage Analysis 43.76 % SiO2 3.46 % Al2O3 3.66 % Na2O 4.57 % CaO 31.47 % PbO 13.09 % B2O3 _____________________ 100 % TOTAL Comments: 6.5 x 10-6 coefficient of thermal expansion (50-450° C) I.F.P. °C = Melting Range °F = 1350-1450 Potential Health Hazards: contains Lead-avoid ingestion. NOT FOR USE WITH WARE INTENDED FOR FOOD.