Abstract
Helium permeation rates have been determined through 20 different glasses using a mass spectrometer to measure the gas flow rates directly. The temperature range investigated was 25°–500°C. Values of diffusion constants and solubilities have been computed for 10 of these glasses. The permeation rate has been related to glass composition. It is felt that a better correlation exists between log permeation rate and mole percent of glass network former (SiO2, B2O3, and P2O5) content than exists between log permeation and weight percent of network former as used by previous workers in this field.

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