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The thickness of voltage-inhibiting films produced on glass surfaces by heat treatment * after leaching has been studied by means of the glass electrode and the interferometer procedure previously used for determining the chemical durability of glasses. The glass electrode gave conspicuous voltage departures (errors) and alterations (swelling) of the surface that were just detectable by the interferometer. This corresponds to approximately 0.01 fringe., or four times the unit cell dimension for cristobalite. The inhibiting effect of films of electric conductors, such as metallic silver, has been qualitatively compared with the inhibiting effect of films prepared from electric nonconductors, such as petrolatum and silicone stopcock grease.

Thickness of inhibiting films on glass electrode surfaces