The International Simple Glass (ISG) is a six-component borosilicate glass which was developed as a reference for international collaborative studies on high level nuclear waste encapsulation. Its corrosion behaviour is typically examined when it is immersed in a leaching solution, or when it is exposed to water vapour. In this study, an alternative situation is considered in which the glass is only partially immersed for 7 weeks at a temperature of 90 °C. In this case, half of the glass sample is directly in the solution itself, and the other half is in contact with a water film formed by condensation of water vapour that evaporated from the solution. This results in a different degradation behaviour compared to standard tests in which the material is fully immersed. In particular, whilst in standard tests the system reaches a steady state with a very low alteration rate thanks to the formation of a protective gel layer, in partially-immersed tests this steady state could not be reached because of the continuous alteration from the condensate water film. The constant input of ions from the emerged part of the sample caused a supersaturation of the solution, which resulted in early precipitation of secondary crystalline phases.

This setup mimics storage conditions once small amounts of water have entered a glass waste form containing canister. It offers a more realistic outlook of corrosion mechanisms happening in such situations than standard fully-immersed corrosion tests.

国际简单玻璃（ISG）是一种六组分硼硅酸盐玻璃，被开发用作有关高水平核废料封装的国际合作研究的参考。当将其浸入浸出溶液中或暴露于水蒸气中时，通常会检查其腐蚀行为。在这项研究中，考虑了另一种情况，其中玻璃仅在90°C的温度下部分浸入7周。在这种情况下，玻璃样品的一半直接位于溶液本身中，另一半与由从溶液中蒸发出来的水蒸气的冷凝形成的水膜接触。与完全浸入材料的标准测试相比，这导致了不同的降解行为。尤其是，在标准测试中，由于形成了保护性凝胶层，系统达到了非常低的变化率的稳定状态，而在部分浸入式测试中，由于冷凝水膜的不断变化，无法达到该稳定状态。来自样品出射部分的恒定离子输入导致溶液过饱和，从而导致次级结晶相的早期沉淀。

一旦少量的水进入了装有罐的玻璃废料形式，此设置将模仿存储条件。与标准的完全浸入式腐蚀测试相比，它提供了在这种情况下发生腐蚀机理的更现实的看法。