WoodHighly 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
wood fibers with portland cement binder
Type M-173 – Fibroplank
PTB reference data
Original description
wood fibers with portland cement binder
Material properties
Manufacturer: Martin Fireproofing Georgia
Thickness: 1 1/2 inch, 2 inches, 2 1/2 inch, 3 inches
Wall distance: 0 mm
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 4 variants
αw
0.60
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.15 | 0.30 | 0.80 | 0.85 | 0.75 | 0.90 |
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| Compare | Value | ||
|---|---|---|---|
| 2 1/2 inch | 7 lb/ft² | αw0.60 | |
| 3 inches | 8 lb/ft² | αw0.60 | |
| 2 inches | 6 lb/ft² | αw0.55 | |
| 1 1/2 inch | 5 lb/ft² | αw0.45 |
Dimensions: 96 x 108 inches
Distance: 0
Measured values as a table (4 measurements)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 1 1/2 inch · 5 lb/ft² · 0 | 0.45 | 0.09 | 0.21 | 0.42 | 1.00 | 0.58 | 0.80 |
| 2 inches · 6 lb/ft² · 0 | 0.55 | 0.13 | 0.23 | 0.62 | 1.03 | 0.61 | 0.81 |
| 2 1/2 inch · 7 lb/ft² · 0 | 0.60 | 0.15 | 0.32 | 0.78 | 0.85 | 0.73 | 0.88 |
| 3 inches · 8 lb/ft² · 0 | 0.60 | 0.20 | 0.30 | 0.89 | 0.70 | 0.88 | 0.92 |
Measured values as a table (4 measurements)
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