Abstract
1. Suitable treatment conditions were chosen so that the depth of corrosion of silicate glasses by alkaline solutions could be determined with the aid of the MII-1 interference microscope (the measurements being accurate within not more than ±10 % ). 2. It was shown that the depth of corrosion of quartz glass is proportional to the duration of treatment and to the concentration of the alkaline solution. With rise in temperature, the depth of corrosion increases in accordance with an exponential law (it is approximately doubled for each 10° rise in temperature). 3. The alkali- stabilities of fifteen technically important glasses were determined under the chosen conditions. Quartz and zirconium-rich glasses were the most stable. Crystalline quartz is more than ten times as stable as quartz glass.
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