In a previous paper, the weathering of the internal surface of empty glass containers before filling was investigated. Several phenomena were identified & described such as leaching of modifiers, formation of a hydrated leached layer & of crystalline deposits mainly consisting of Ca-carbonates & Na-carbonates. Localised glass surface corrosion was sometimes also detected. The role of the storage conditions, time, temperature, relative humidity & concentrations of pollutant gases (CO2, SO2) in the weathering phenomena was highlighted. In this work, the composition of the weathered glass layer & the nature of the crystalline deposits are investigated. Furthermore, in order to examine more closely the weathering mechanisms & their causes, the correlation between durability, lab tests & chemical composition of SLS glass are discussed.
