Studies of the chemical durability of glass by an interferometer method

An interferometer method for determining the chemical durability of glass has been tried on a series of typical glasses over a wide range of temperature and pH. The results emphasize the importance of careful temperature control if comparisons are to be made between the findin gs of different investigators. The relations between amount of attack and pH for some of the glasses show pronounced inflections near p H 7 in the presence of Britton universal buffer, while the attack by distilled wat er for these same glasses is very slight in comparison. Moreover, the results strongly emphasize the fact that there can be no single test by which the durability of glass can be judged with respect to all conditions of service.