Water solubility and diffusion in melts of commercial silicate glasses

Water solubilities and diffusivities have been measured in melts of commerc ial (float, container, wool, E-glass, TV panel) glasses at temperatures ran ging from 900 to 1400 degreesC. The solubility of water in these melts is e ssentially independent of temperature, with values lying between 1000 and 1 200 wtppm for the float, container, wool, and E-glass melts and at approxim ately 1600 wtppm for the TV panel melts. The diffusivity of water for all m elts lies increases with increasing temperature, with values between 5 x 10 (-7) and 5 x 10(-5) cm(2)/s for all melts. While an apparent correlation ca n be made between the diffusivity of water and the viscosity of the melt, t his correlation cannot be taken as proof that such a correlation is a gener al phenomenon.