Some procedures are shown how to calculate the release of gases after increasing temperatures. Also called fining reactions in the glass melt. Results are given for antimony oxide & sulfate fining. The increase of the internal pressure of gases in the he melt, which is caused by the release of oxygen or sulphur dioxide, is derived from thermodynamic calculations & can be presented as a function of redox state of the melt. Temperatures for initialisation of the antimony oxide refining process in soda lime glass melts, depending on redox states are given for some cases. Temperature range for sulfate refining in flint or green glasses is determined, assuming O2 & SO2 as the major refining gases. Growth rate & change in composition of bubbles, due to diffusion of these refining gases, is given for different redox states, temperatures & polyvalent ions in soda lime glass melts.
