37C.Ferro Frit 3516 Wt: 236.1 Fusion temp: 1400 °F Molecular Formula: K2O 0.044 Al2O3 0.061 SiO2 1.24 Na2O 0.040 B2O3 0.442 CaO 0.517 MgO 0.001 PbO 0.398 Percentage Analysis: 31.6 % SiO2 2.6 % Al2O3 1.8 % K2O 1.1 % Na2O 12.3 % CaO 37.6 % Pbo 13.0 % B2O3 trace MgO Comments: Source William Hunt in Ceramics Monthly May 1978 26(5) p.48-54; 7.6 x 10-6 coefficient d