Abstract
The effect of different amounts of ZnO on the chemical durability of a borosilicate glass is discussed. Up to 16% of ZnO the leaching rate is constantly depleted and related to the zinc content. For this powdered sample the weight loss after 24 days of leaching at 70°C is only 8%, which is a very low value. The altered surface was studied by means of RBS and NRA techniques and it was possible to find a layer poor in zinc and rich in silicon, which peels off in different times depending on the glass composition. The thickness of this layer is also related to the zinc content. Because of the poor zinc content of the surface layers the improved durability of the zinc glasses is not attributed to a surface layer effect, but to the bulk structure of the glass in which the role of the zinc becomes very important.
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