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
Sto Classic Nubby prefinished lay-in board
Classic
PTB reference data
Original description
Sto Classic Nubby prefinished lay-in board
Material properties
Manufacturer: Sto Ges.m.b.H
Thickness: 3/4 inch, 1 inch, 1 1/2 inch
Wall distance: 16 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 | 0.70 | 0.85 | 0.95 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | ||
|---|---|---|---|
| 1 1/2 inch | 0.38 lb/ft² | NRC1.00 | |
| 1 inch | 0.25 lb/ft² | NRC0.95 | |
| 3/4 inch | 0.19 lb/ft² | NRC0.85 |
NRC: 1.00 (derived from ISO 354 lab data)
Dimensions: 24 x 48 inches
Distance: 16 in
Measured values as a table (3 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 3/4 inch · 0.19 lb/ft² · 400 mm | 0.85 | 0.33 | 0.47 | 0.89 | 0.97 | 1.07 | 0.94 |
| 1 inch · 0.25 lb/ft² · 400 mm | 0.95 | 0.83 | 0.88 | 0.80 | 1.05 | 1.06 | 1.08 |
| 1 1/2 inch · 0.38 lb/ft² · 400 mm | 1.00 | 0.71 | 0.87 | 0.97 | 1.10 | 1.07 | 1.03 |
Measured values as a table (3 measurements)
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