ACOUSTIC PERFORMANCE
Acoustic performance
Sound-absorption performance of micro-perforated panels with acoustic fleece, mineral wool or polyester absorber.
PANEL + PERFORATION + ABSORBER
Acoustic performance comes from the complete configuration.
A perforated metal panel allows sound energy to interact with the absorber behind it. Hole size and open-area ratio, the type of fleece or absorber and the overall build-up change the response at different frequencies.
The table compares configurations using 1522, 3029 and 5050 perforations. The values provide a quick comparison of αw, absorption class and NRC; frequency-by-frequency data are available in the complete technical sheet.
- αw: weighted sound absorption coefficient
- Absorption class using the EN ISO 11654 reference
- NRC for concise comparison of configurations
- Perforation and backing material determine the response
- Values calculated with ALPHA-CELL® using the TIMM method
| Configuration | Pattern | αw | Class | NRC |
|---|---|---|---|---|
| Fleece | 1522 | 0.75 | C | 0.61 |
| Fleece | 3029 | 0.70 | C | 0.60 |
| Fleece | 5050 | 0.60 | C | 0.64 |
| Fleece + mineral wool | 1522 | 0.80 | B | 0.60 |
| Fleece + mineral wool | 3029 | 0.75 | C | 0.55 |
| Fleece + mineral wool | 5050 | 0.75 | C | 0.13 |
| Polyester | 1522 | 0.87 | B | 0.82 |
How the values are obtained
The TRE C sheet presents the table with reference to EN ISO 354 and cites EN ISO 11654 and EN 12354-6 for sound absorption. The published values are calculated with ALPHA-CELL® software using the TIMM (Transfer Impedance of Multi-layers) method to estimate the performance of poro-elastic multilayer materials. They are therefore not presented on this website as laboratory test results.