X-RAY REFLECTIVITY INVESTIGATIONS OF GLASS SURFACES PRODUCED BY FLOATAND DRAW TECHNIQUES

Surfaces of soda-lime glass and borosilicate glass have been investiga ted by grazing incidence X-ray reflectivity (GIXR). Characteristic dif ferences are obtained in dependence on the fabrication procedure, the composition and the cleaning procedure. Strong variation is recorded b etween the two soda-lime float glass surfaces while minor differences are analysed between the top and bottom side of borosilicate float gla ss. This is attributed to the reduced amount of tin diffused into the bottom side of the borosilicate glass surface. Different cleaning proc edures generate characteristic changes on the glass surfaces which can be verified by GIXR. The results indicate that borosilicate float gla ss combines the merits of the good surface quality of float glass with the high chemical resistivity of borosilicate glass.