What happens if foamglas is exposed to excessive moisture?

When Foamglas is exposed to excessive moisture, it can swell and expand as it absorbs water. Foamglas is a cellular glass insulation material that has a closed-cell structure, which means it is designed to resist moisture intrusion under normal conditions. However, when subjected to high levels of moisture over time, the material may begin to absorb some of that moisture, leading to physical changes such as swelling. This expansion can compromise its insulating properties and structural integrity, which makes understanding its interaction with moisture critical for its effective use in insulation applications. The other options do not accurately reflect the behavior of Foamglas when faced with moisture exposure.