Sound reduction index Rw ranking (same thickness 50mm): PU > PVC > XPS ≈ PET. Reason: PU foam’s soft segment structure has high viscoelasticity, converting sound energy into heat dissipation through internal friction, especially effective for low-to-mid frequencies (250–1000 Hz); PVC foam has numerous polymer chain side groups, strongly scattering sound waves; XPS and PET are rigid foams, allowing easier sound transmission. In practice, a 50mm thick PU sandwich panel can achieve Rw of 30–32 dB, while XPS of the same thickness achieves only 26–28 dB. To improve sound insulation, asymmetric facings (e.g., 1.5mm steel + 0.8mm aluminum) or increased core thickness to 100mm can be used. Note that sound insulation is not linearly related to thickness; the core’s dynamic Young’s modulus is a key parameter.
How do the sound insulation performances of different core sandwich panels rank, and why?
- XPS Foam Core
- PET Foam Core
- PVC Foam Core
- PU Foam Core
- PMI Foam Core
- PP Honeycomb Core
- Balsa Wood
- XPS Backer Board
- FRP XPS Sandwich Panel
- FRP PET Sandwich Panel
- FRP PVC Sandwich Panel
- FRP PP Honeycomb Panel
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