Mineral woolHighly 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
Rockwool blanket
Fibertex 350
PTB reference data
Original description
Rockwool blanket
Material properties
Manufacturer: Bradford Insulation
Thickness: 1 in, 2 in, 3 in
Wall distance: 0 in
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 | 0.30 | 0.70 | 1.00 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | ||
|---|---|---|---|
| 2 in | 3.00 kg / m² | NRC1.00 | |
| 3 in | 4.50 kg / m² | NRC1.05 | |
| 1 in | 1.50 kg / m² | NRC0.70 |
NRC: 1.00 (derived from ISO 354 lab data)
Dimensions: 35 in x 59 in
Distance: 0
Measured values as a table (3 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 25 mm · 1.50 kg / m² · 0 | 0.70 | 0.18 | 0.29 | 0.69 | 0.86 | 1.05 | 1.20 |
| 50 mm · 3.00 kg / m² · 0 | 1.00 | 0.29 | 0.70 | 1.19 | 1.04 | 1.14 | 1.06 |
| 75 mm · 4.50 kg / m² · 0 | 1.05 | 0.60 | 1.03 | 1.13 | 0.99 | 1.07 | 1.01 |
Measured values as a table (3 measurements)
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