The pre-treatment of glass surfaces for the application of silicones in the prevention of electrical leakages. Part I. A glass of high alkali oxide content

JSGT 1958 V42 T227-T239

The measured volume electrical resistivity of glass at room temperature in normal atmospheres is generally much lower than the theoretical value owing to leakage currents across the glass surface. Such currents can be reduced by applying silicone films. The direct application of silicones to some glasses, particularly those of high alkali content, is not completely effective after prolonged exposure to conditions of high humidity, such as tropicalization tests. Pre-treatment of the glass surface to deplete it of alkali ions, by simple washing, or more effectively by a controlled leaching, followed by baking, before siliconing, provides maximum protection against humid conditions.

J. Edge & L. F. Oldfield