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
Permacote, coated, smooth R-300 duct liner, spacing 0/25 mm
Linacoustic
PTB reference data
Original description
Permacote, coated, smooth R-300 duct liner, spacing 0/25 mm
Material properties
Manufacturer: Manville
Thickness: 1 inch, 1 1/2 inch, 2 inch
Wall distance: 0 in, 1 in
Surface: smooth
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 6 variants
NRC
1.05
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.80 | 1.00 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | |||
|---|---|---|---|---|
| 2 inches | 0.50 lb/ft² | 0 | NRC1.05 | |
| 2 inches | 0.50 lb/ft² | 1 in | NRC1.05 | |
| 1 1/2 inch | 0.38 lb/ft² | 0 | NRC0.95 | |
| 1 1/2 inch | 0.38 lb/ft² | 1 in | NRC0.90 | |
| 1 inch | 0.25 lb/ft² | 1 in | NRC0.80 | |
| 1 inch | 0.25 lb/ft² | 0 | NRC0.80 |
NRC: 1.05 (derived from ISO 354 lab data)
Dimensions: roll
Measured values as a table (6 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 1 inch · 0.25 lb/ft² · 0 | 0.80 | 0.08 | 0.32 | 0.72 | 0.99 | 1.07 | 1.00 |
| 1 1/2 inch · 0.38 lb/ft² · 0 | 0.95 | 0.15 | 0.63 | 1.01 | 1.07 | 1.01 | 0.88 |
| 2 inches · 0.50 lb/ft² · 0 | 1.05 | 0.27 | 0.81 | 1.11 | 1.13 | 1.06 | 1.05 |
| 1 inch · 0.25 lb/ft² · 25 mm | 0.80 | 0.53 | 0.39 | 0.70 | 1.00 | 1.09 | 1.01 |
| 1 1/2 inch · 0.38 lb/ft² · 25 mm | 0.90 | 0.60 | 0.58 | 1.01 | 1.09 | 1.01 | 0.90 |
| 2 inches · 0.50 lb/ft² · 25 mm | 1.05 | 0.67 | 0.77 | 1.13 | 1.14 | 1.09 | 1.06 |
Measured values as a table (6 measurements)
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