37D.Ferro Frit 3565 Mol Wt: 326.9 Fusion temp: 1600 °F Molecular Formula: K2O 0.104 Al2O3 0.180 SiO2 2.938 Na2O 0.084 B2O3 0.366 ZrO2 0.055 CaO 0.577 PbO 0.234 Percentage Analysis: 54.0 % SiO2 5.6 % Al2O3 1.6 % K2O 3.0 % Na2O 9.9 % CaO 16.0 % PbO 7.8 % B2O3 2.1 % ZrO2 Comments: Lead borosilicate frit for use in glazes ^01 - ^5; 7.2 x 10-6 coefficient of expansion; similar