28.Ferro Frit 3403 M.P./°F 1500 Silica/Alumina ratio: 20.7:1 Equivalent Molecular Weight: 307.500 Molecular Formula of Ferro Frit 3403: K2O 0.046 Al2O3 0.069 SiO2 1.439 Na2O 0.015 CaO 0.006 PbO 0.934 Percentage Analysis 28.10 % SiO2 2.30 % Al2O3 1.40 % K2O 0.30 % Na2O 0.10 % CaO 67.79 % PbO _____________________ 100 % TOTAL Comments: 7.2 x10-6 Coefficient of expansion Potential Health Hazards: Contains Lead-avoid ingestion. NOT FOR USE WITH WARE INTENDED FOR FOOD. Follow safe firing practices