Mineral woolHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Sound System Engineering, Don Davis and Carolyn Davis
Value from the PTB table, not verified
Fiberboard, 1/2 inch normal soft, mounted against solid backing
PTB reference data
Original description
Fiberboard, 1/2 inch normal soft, mounted against solid backing
Material properties
Thickness: 1/2 inch
Mounting: against solid backing
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.20
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.10 | 0.15 | 0.25 | 0.30 | 0.30 |
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| Compare | Value |
|---|---|
| NRC0.20 | |
| NRC0.10 |
NRC: 0.20 (derived from ISO 354 lab data)
Measured values as a table (2 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| unpainted | 0.20 | 0.05 | 0.10 | 0.15 | 0.25 | 0.30 | 0.30 |
| some painted | 0.10 | 0.05 | 0.10 | 0.10 | 0.10 | 0.10 | 0.15 |
Measured values as a table (2 measurements)
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