The partial solubility of soda-lime glass by attack of water is described by holding glass grains with a defined and specific surface at a temperature of 121 °C for 30 minutes in distilled water. During this procedure especially alkaline components of the grains’ surface will be extracted.
After that, their content in the solution is determined by titration with diluted muriatic acid. Accordingly the alkaline contents the glass is divided in hydrolytic classes.
(Samples: flinders or products)