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
Vinyl membrane facing over fiberglass lay-in panel
Type 2921
PTB reference data
Original description
Vinyl membrane facing over fiberglass lay-in panel
Material properties
Manufacturer: Armstrong World Industries
Thickness: 1 1/2 inch
Wall distance: 16 in
Backing: fiberglass lay-in panel
Surface: Vinyl membrane
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.80
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.55 | 0.80 | 0.75 | 0.90 | 0.70 | 0.45 |
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Value from the PTB table, not verified
NRC: 0.80 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 1 1/2 inch · 0.3 lb/ft² · 400 mm | 0.80 | 0.57 | 0.79 | 0.77 | 0.90 | 0.71 | 0.47 |
Measured values as a table (1 measurement)
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