In the context of construction materials, “non-decomposable” means the PET foam core is engineered to resist molecular chain scission from hydrolysis, microbial attack, and normal environmental weathering over its design life. It is a stable, inert polymer matrix that will not rot, mildew, dissolve, or lose its mechanical properties over time, unlike biodegradable materials. This property validates its intended service life of 50+ years, matching the building’s design lifetime and eliminating the nightmare scenario of a functioning building needing its core insulation layer torn off and replaced due to material decay.

