ISG-2: properties of the second International Simple Glass

Given the importance of glass materials to society, their durability when exposed to aqueous solutions is a critical area for research, particularly for vitrified radioactive wastes. This spurred an international team to fabricate a standardized composition based on waste immobilization glass called the International Simple Glass (ISG), which has been the subject of numerous experimental and computational studies focused on aqueous corrosion resistance.With the original batch of ISG nearly depleted, the international team designed and fabricated a standard glass material, ISG-2, where half the Ca in the original composition was replaced with Mg by mole. This paper presents information on both the ISG-2 composition and a new batch with the same nominal composition as the original ISG, designated ISG-1, including their homogeneity, their physical and thermal properties. The results of static alteration experiments are presented as well to provide a baseline for future aqueous corrosion performance investigations.

Automated summary

Due to the significance of glass materials in society, research on their durability in aqueous solutions is crucial, especially in regards to vitrified radioactive wastes. An international team created a standardized composition called the International Simple Glass (ISG) for waste immobilization glass, which has been extensively studied for its resistance to aqueous corrosion. With the depletion of the original batch of ISG, the team designed and fabricated ISG-2 with half of the Ca replaced by Mg. This paper presents information on both ISG-2 and a new batch, ISG-1, with the same composition as the original ISG, including their homogeneity and physical and thermal properties.