WoodHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data
Value from the PTB table, not verified
MAkustik acoustic panel Type 9/2, slotted
Type 9/2 – MAkustik MA04 continuously slotted
PTB reference data
Original description
MAkustik acoustic panel Type 9/2, slotted
Material properties
Manufacturer: MAkustik
Thickness: 1.8 in
Wall distance: 13 in
Perforation: 18% slots (approx. 8% open area)
Backing: acoustic non-woven faced, 1.2 in mineral wool
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.85
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.85 | 0.95 | 0.85 | 0.95 | 0.75 | 0.55 |
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Value from the PTB table, not verified
NRC: 0.85 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 46 mm · 320 mm | 0.85 | 0.50 | 1.09 | 1.03 | 1.02 | 0.95 | 0.88 | 0.83 | 0.79 | 0.90 | 0.95 | 0.96 | 0.90 | 0.85 | 0.72 | 0.67 | 0.60 | 0.53 | 0.53 |
Measured values as a table (1 measurement)
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