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The effect of hydrochloric acid and sodium hydroxide solutions on some lead borate glasses con­ taining high proportions of lead oxide was investigated to study the chemical durability of these glas­ ses in different aqueous media. Different factors were studied such as the glass composition, con­ centration of the aqueous solution, temperature, and time of immersion. The change in the value of the mass loss (<5/(g cm-2)) with the change in the glass composition was found to be due to the change in the corrosion rate. In the case of increasing the concentration of the immersion solution, the in­ crease in the mass loss can be attributed to the pH value. The results obtained from the immersion condition were also explained. Glass is distinguished, besides other properties, by its great resistance with respect to most chemi­ cals at usual temperatures. Without this property, the wide range of the glass applications would be unthinkable. The term chemical durability has been used conventionally to express the resistance offered by a glass towards the attack by aqueous solutions and atmospheric agents. There is no absolute or explicit measure of the chemical durability and the different glasses are usually graded relative to one another after subjecting them to similar experimen­ tal conditions. The interactions between a glass and different aque­

Chemical durability of some lead borate glasses in different aqueous solutions