The chemical composition of XPS (polystyrene) is extremely sensitive to UV radiation. Direct sunlight exposure for 6 months leads to surface chalking, yellowing, and strength loss. However, as a sandwich panel core (completely encapsulated by metal or composite facings), it is not exposed to UV. Even so, the blowing agent gas (typically CO₂ or cyclopentane) slowly diffuses out and is replaced by air, increasing thermal conductivity by 0.5–1.5% per year. The 50-year lifespan is based on conditions: 1) XPS density ≥35 kg/m³; 2) use of modified aging-resistant formulations (terpolymers); 3) ambient temperature ≤40°C with no frequent freeze-thaw cycles. In freeze-thaw regions, condensed moisture freezing within the XPS core can cause premature cracking, with actual lifespan around 20–30 years.
How good is XPS foam’s aging resistance? Why do some brands claim a 50-year lifespan?
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