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, with 3/16 inch perforated Transite board
PTB reference data
Original description
Rockwool blanket, 2 inch thick batt, with 3/16 inch perforated Transite board
Material properties
Thickness: 2 inch (Rockwool), 3/16 inch (Transite)
Wall distance: 1 inch
Perforation: 11%
Backing: Rockwool blanket
Surface: perforated cement asbestos board (Transite)
Measurement data
Sound absorption
ISO 354 – reverberation chamber
αw
0.65
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.40 | 0.75 | 1.00 | 0.85 | 0.60 | 0.50 |
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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 | 0.65 | 0.39 | 0.77 | 0.99 | 0.83 | 0.58 | 0.50 |
Measured values as a table (1 measurement)
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