A Critical Examination of Methods used in Determining the Durability of Glass.

JSGT 1922 V06 T030-T045

Many and various are the methods which have been proposed and employed from time to time for the comparison of the durability of glass, ranging from the rapid method of boiling glass powder in water to the slow one of exposing slabs or cubes to the action of atmospheric air for a period of a year or more. Since 1917, several new, or at least modified, methods have been employed, including the boiling of glass discs in the reagent, the passage of water vapour over polished cubes, and the heating of pieces of glass with water in sealed tubes. It is not the purpose of this paper to examine each of the various methods proposed, but rather those three or four which have been employed fairly generally. These methods involve (1) the testing of the surfaces of glass vessels, (2) the use of plates, discs or slabs of the glass, (3) the treatment of the glass in the form of powder, (4) the autoclave test. 

W. E. S. Turner