38.Ferro Frit 3576 M.P./°F 1500 Silica/Alumina ratio: 19.6:1 Equivalent Molecular Weight: 339.301 Molecular Formula of Ferro Frit 3576: Na2O 0.208 Al2O3 0.116 SiO2 2.283 CaO 0.291 B2O3 0.670 ZrO2 0.022 PbO 0.501 Percentage Analysis 40.41 % SiO2 3.50 % Al2O3 3.80 % Na2O 4.80 % CaO 32.99 % PbO 13.70 % B2O3 0.80 % ZrO2 _____________________ 100 % TOTAL Comments: 7.1 x 10-6 coefficient of expansion (50-450° C) Potential Health Hazards: Contains Lead-avoid ingestion. NOT FOR USE WITH WARE INTENDED FOR FOOD. Follow safe firing practices for lead glazes.