37.Ferro Frit 3493 M.P./°F 1500 Silica/Alumina ratio: 24.5:1 Equivalent Molecular Weight: 375.093 Molecular Formula of Ferro Frit 3493: K2O 0.076 Al2O3 0.114 SiO2 2.792 Na2O 0.091 B2O3 0.697 CaO 0.308 PbO 0.526 Percentage Analysis 44.70 % SiO2 3.10 % Al2O3 1.90 % K2O 1.50 % Na2O 4.60 % CaO 31.30 % PbO 12.90 % B2O3 _____________________ 100 % TOTAL Comments: 6.7 x 10-6 coefficient of expansion (50-450°C) Potential Health Hazards: Contains Lead-avoid ingestion. safe firing practices