Mechanism Of Volatilization Of Fluorides From E-Glass Melts

Volatilization of fluorine and boron compounds from E-glass melts containing up to 1.55 wt% fluorine was investigated in a flowing air atmosphere in the temperature range 1250 to 1350 deg C employing the transpiration method. The mass loss and the amounts of fluorine and B2O3 emitted were determined discontinuously as a function of time. The kinetics of B2O3 emission from fluorine-containing as well as fluorine-free E-glass melts can be approximated by the model of a first order process of B2O3 with water vapour from the atmosphere at the melt surface.