Stone & concreteHighly 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
Acoustile, surface glazed and perforated structural clay tile, perforated surface backed with 4 inch glass fiber blanket of 1 lb/ft² density
PTB reference data
Original description
Acoustile, surface glazed and perforated structural clay tile, perforated surface backed with 4 inch glass fiber blanket of 1 lb/ft² density
Material properties
No further information available.
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.65
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.55 | 0.65 | 0.95 | 0.45 | 0.55 |
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Value from the PTB table, not verified
NRC: 0.65 (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 | 0.65 | 0.26 | 0.57 | 0.63 | 0.96 | 0.44 | 0.56 |
Measured values as a table (1 measurement)
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