XPS has a coefficient of thermal expansion of approximately 70–90×10⁻⁶/K, steel about 12×10⁻⁶/K, and aluminum about 23×10⁻⁶/K. When sandwich panels experience daytime heating or cold storage temperature shocks, the differential deformation between core and face induces interfacial shear stress. Especially during summer construction, dark steel sheets can reach 65°C, causing XPS core to expand by 0.5 mm/m, but the steel facing restricts this, leading to edge warping in a “smile” or “cry” shape. Solutions include: pre-heating lamination to balance internal stress; increasing face thickness to enhance flexural stiffness; using modified low-expansion XPS; or employing discontinuous adhesive bonding to allow micro-displacement.
Why are XPS foams prone to thermal warping with metal facings, and how to handle it?
- XPS Foam Core
- PET Foam Core
- PVC Foam Core
- PU Foam Core
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- PP Honeycomb Core
- Balsa Wood
- XPS Backer Board
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- FRP PVC Sandwich Panel
- FRP PP Honeycomb Panel
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- 0086–15818199755
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