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Material properties of the investigated materials. PA66: polyamide 66; PMMA: polymethyl methacrylate; PP: polypropylene.
| Material | Type | Density (g/cm3) |
Melt Flow Index (g/10 min, ASTM D 1238) |
Acoustic Impedance (Pa·s/m) | |
|---|---|---|---|---|---|
| Solid | Liquid | ||||
| PMMA | Amorphous | 1.19 | 10 | 3.20 × 106 | 1.23 × 106 |
| PP | Semi-crystalline | 0.9 | 15 | 1.11 × 106 | 4.28 × 105 |
| PA66 | Crystalline | 1.14 | 24 | 2.90 × 105 | 1.10 × 105 |
