Method for measuring the hydrolytic resistance of the surface of flat glass A report by the International Commission on Glass, Technical Committee 2, Chemical Durability and Analysis

Abstract

In international collaborative work by TC 2 of ICG a proposed method for testing the chemical durability of original flat glass surfaces, such as float glass or sheet glass, was examined and optimized. The test should give the possibility to measure even small deviations of chemical durability, for instance of float glass, for the tin bath side and the atmospheric side. In a special device, surfaces of the cleaned samples of flat glasses are leached by distilled water at 96 °C for 1 h. To the extract solution a spectrochemical buffer solution is added, and in the final solution Na2O is analysed by flame spectrometrie methods (AAS or AES). The procedure must be followed very precisely in order to be able to analyse even so complicated analytical objects like original glass surfaces with a low coefficient of (between-laboratory) variance of about 5.