The migration of water into commercial borosilicate glass was measured, at temperatures ranging from 200 to 500C, by using infra-red spectrophotometry. The glass initially exhibited absorption bands at about 3600/cm and at about 2750/cm; but only the former absorption band increased with increasing low-temperature water diffusion. The diffusivity could be described by:

D (cm2/s) = 2.8 x 10-7 exp[-52(kJ/mol)/RT]

The data for a water vapor pressure of more than 355mmHg were consistent with a solubility that was proportional to the square root of the water vapor pressure and with a diffusion coefficient which was independent of the concentration.

H.Tomozawa, M.Tomozawa: Journal of Non-Crystalline Solids, 1989, 109[2-3], 311-7