XPS (Extruded Polystyrene) and PVC foam cores differ significantly in mechanical strength, thermal behavior, and long-term durability.
XPS has a closed-cell structure with excellent thermal insulation and moisture resistance, but its compressive and shear strength are relatively lower than PVC foam. This makes XPS more suitable for insulation panels and non-load-bearing structures rather than high-performance composites.
PVC foam core, on the other hand, is engineered for structural applications. It offers higher shear modulus, better fatigue resistance, and superior bonding compatibility with resins like epoxy and polyester. PVC also maintains dimensional stability under cyclic loads, making it widely used in marine, wind energy, and aerospace interiors.
In summary:
- XPS → insulation + lightweight core (low cost)
- PVC → structural composite core (high performance)
