The SLCA was carried-out for conductivity data collected at 50°C, 150°C, and 250°C (Table ). The [Na/P/O] and [P/F/Al] genes are practically insensitive to temperature within this range, indicating structural stability below Tg. For all other genes and, in particular, [Na/O/S], the relative contribution of Na increases notably with increasing temperature. At the same time, the weight of P in [Na/P/S] decreases. These observations reflect that temperature affects primarily the sulfate bridge in its strength to localize Na ion species. With increasing temperature, the sulfate entity interacts with less and less phosphate groups and, in turn, assembles more Na in its vincinity. Overall, it is not surprising that the gene stoichiometry is temperature dependent, given the multitude of interaction potentials within multi-component glasses such as the present ones.