Stone & concreteHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994
Value from the PTB table, not verified
Proudfoot Soundblox Type A1 slotted concrete block, unfilled
Type A1 – Soundblox
PTB reference data
Original description
Proudfoot Soundblox Type A1 slotted concrete block, unfilled
Material properties
Manufacturer: Proudfoot Co.
Thickness: 4 inches, 6 inches, 8 inches
Wall distance: 0 mm
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 3 variants
αw
0.45
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.95 | 0.45 | 0.40 | 0.40 | 0.50 | 0.60 |
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| Compare | Value | ||
|---|---|---|---|
| 8 inches | 32 lb/ft² | αw0.45 | |
| 4 inches | 23 lb/ft² | αw0.40 | |
| 6 inches | 26 lb/ft² | αw0.35 |
Dimensions: 8 x 16 inches
Distance: 0
Measured values as a table (3 measurements)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 4 inches · 23 lb/ft² · 0 | 0.40 | 0.12 | 0.85 | 0.36 | 0.36 | 0.42 | 0.45 |
| 6 inches · 26 lb/ft² · 0 | 0.35 | 0.62 | 0.84 | 0.36 | 0.43 | 0.27 | 0.50 |
| 8 inches · 32 lb/ft² · 0 | 0.45 | 0.97 | 0.44 | 0.38 | 0.39 | 0.50 | 0.60 |
Measured values as a table (3 measurements)
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