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
Mat-faced, smooth, duct liner
Linacoustic
PTB reference data
Original description
Mat-faced, smooth, duct liner
Material properties
Manufacturer: Manville
Thickness: 1 inch, 1 1/2 inch, 2 inches
Wall distance: 0 in
Surface: smooth
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 3 variants
NRC
0.95
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.20 | 0.70 | 1.00 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | ||
|---|---|---|---|
| 2 inches | 0.22 lb/ft² | NRC0.95 | |
| 1 1/2 inch | 0.19 lb/ft² | NRC0.85 | |
| 1 inch | 0.22 lb/ft² | NRC0.65 |
NRC: 0.95 (derived from ISO 354 lab data)
Dimensions: roll
Distance: 0
Measured values as a table (3 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 1 inch · 0.22 lb/ft² · 0 | 0.65 | 0.08 | 0.26 | 0.58 | 0.84 | 0.96 | 0.99 |
| 1 1/2 inch · 0.19 lb/ft² · 0 | 0.85 | 0.17 | 0.53 | 0.87 | 0.99 | 1.00 | 0.95 |
| 2 inches · 0.22 lb/ft² · 0 | 0.95 | 0.22 | 0.69 | 1.02 | 1.08 | 1.05 | 1.08 |
Measured values as a table (3 measurements)
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