Thermal Analysis Of Lead Glass Batch

The melting reactions in a sodium-potassium-lead silicate glass batch were studied simultaneously by D T A, TG, and DTG in conjunction with x-ray diffraction analysis to identify the phases which formed during heat treatment. The batch using ground (-325 mesh) tribasic lead silicate underwent low temperature reactions, ultimately forming at about 850 C a liquid which contained all of the alkali and lead oxide and some of the silica. The use of granular (-10+80mesh) tribasic lead silicate resulted in the formation of two liquid phases, of substantially different densities,which assimilated the remaining silica, but did not form a single homogeneous melt.