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
2 inch Tectum over 2 1/2 inch OCF noise barrier batt
panel
PTB reference data
Original description
2 inch Tectum over 2 1/2 inch OCF noise barrier batt
Material properties
Manufacturer: Tectum
Thickness: 4 1/2 inch
Wall distance: 1.6 in, 0.8 in
Surface: perforated
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 3 variants
NRC
1.00
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.40 | 0.90 | 1.00 | 0.85 | 1.00 | 0.95 |
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| Compare | Value | |
|---|---|---|
| covered with perforated facing, airspace 1.6 in | NRC1.00 | |
| covered with perforated facing, airspace 1.6 in | NRC0.95 | |
| covered with perforated facing, airspace 0.8 in | NRC0.90 |
NRC: 1.00 (derived from ISO 354 lab data)
Weight / density: 3.4 lb/ft²
Dimensions: 24 x 48 inches
Measured values as a table (3 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 4 1/2 inch · 3.4 lb/ft² · covered with perforated facing, airspace 40 mm | 1.00 | 0.42 | 0.89 | 1.19 | 0.85 | 1.08 | 0.94 |
| 4 1/2 inch · 3.4 lb/ft² · covered with perforated facing, airspace 20 mm | 0.90 | 0.24 | 0.57 | 1.17 | 0.87 | 0.93 | 0.87 |
| 4 1/2 inch · 3.4 lb/ft² · covered with perforated facing, airspace 40 mm | 0.95 | 0.40 | 0.84 | 1.18 | 0.84 | 0.94 | 0.88 |
Measured values as a table (3 measurements)
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