Abstract
The surface deterioration of glass by the attack of formic acid vapor was observed by an optical microscope, an ellipsometer, an X-ray diffractometer and an electron microprobe X-ray analyzer. The refractive index and thickness of the anomalous surface film formed on the glass were measured by means of ellipsometry. In the weathering of SF-3 and KzFS-2 glasses, the presence of water vapor in the atmosphere is necessary to produce stains on the glass surface. In the SF-3 glass with a SiO 2 network, the diffusion of Pb 2+ and the formation of fine crystalline lead formate play important roles. In the KzFS-2 glass with a B 2O 3 network, both the destruction of the B 2O 3 network and the formation of fine crystals of boric acid play important roles. The diffusion of Pb 2+ is not so important.
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