How does Extruded Polystyrene Foam differ from molded EPS foam?

Extruded Polystyrene Foam differs fundamentally from EPS due to its manufacturing method and resulting cell structure. Unlike EPS, which is composed of fused beads with inter-granular voids, Extruded Polystyrene Foam is formed through a continuous extrusion process that creates a sealed, closed-cell matrix. This difference gives Extruded Polystyrene Foam significantly lower water absorption, higher compressive strength, and more predictable thermal performance. EPS may be more cost-effective and easier to shape on-site, but Extruded Polystyrene Foam offers superior long-term insulation stability, particularly in conditions involving moisture exposure, mechanical loading, or freeze–thaw stresses.


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