Mineral woolHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Sound System Engineering, Don Davis and Carolyn Davis
Value from the PTB table, not verified
Rockwool blanket, 2 inch thick batt, 3/16 inch perforated Transite board, 11% open area (series 2)
PTB reference data
Original description
Rockwool blanket, 2 inch thick batt, 3/16 inch perforated Transite board, 11% open area (series 2)
Material properties
Thickness: 50.8 mm, 4.76 mm
Perforation: 11%
Backing: solid backing
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.70
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.55 | 1.00 | 0.90 | 0.60 | 0.85 |
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Value from the PTB table, not verified
Measured values as a table (1 measurement)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.70 | 0.23 | 0.53 | 0.99 | 0.91 | 0.62 | 0.84 |
Measured values as a table (1 measurement)
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