Abstract
High chemically durable porous glasses containing Na2O, Al2O3, ZrO2 and SnO2 up to about 10wt% were obtained by using immiscible SiO2-B2O3-RO glass systems as the base glass. It was found that the amounts of Al2O3, ZrO2 and SnO2 in porous glasses increased with increasing heating temperature. Alkali resistance of these porous glasses was 6-20 times higher than that of usual Vycor type porous glass.
