OtherHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Sound System Engineering, Don Davis and Carolyn Davis
Value from the PTB table, not verified
Spincoustic blanket, 2 inch, covered with 3/16 inch perforated cement-asbestos board (Transite), 11% open areas
PTB reference data
Original description
Spincoustic blanket, 2 inch, covered with 3/16 inch perforated cement-asbestos board (Transite), 11% open areas
Material properties
Thickness: 2 inch, 3/16 inch
Perforation: 11%
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.85
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.80 | 1.00 | 0.95 | 0.70 | 0.60 |
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Value from the PTB table, not verified
NRC: 0.85 (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 |
|---|---|---|---|---|---|---|---|
| Measurement 1 | 0.85 | 0.25 | 0.80 | 0.99 | 0.93 | 0.72 | 0.58 |
Measured values as a table (1 measurement)
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