Glass & transparentHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data unter www.ibp.fhg.de/rata
Value from the PTB table, not verified
Fraunhofer IBP micro-perforated polycarbonate foil absorber
PTB reference data
Original description
Fraunhofer IBP micro-perforated polycarbonate foil absorber
Material properties
Manufacturer: Fraunhofer IBP
Wall distance: 5.1 in, 3.9 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.60
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.05 | 0.30 | 0.70 | 0.70 | 0.70 | 0.55 |
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Value from the PTB table, not verified
NRC: 0.60 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 100 Hz | 125 Hz | 160 Hz | 200 Hz | 250 Hz | 315 Hz | 400 Hz | 500 Hz | 630 Hz | 800 Hz | 1000 Hz | 1250 Hz | 1600 Hz | 2000 Hz | 2500 Hz | 3150 Hz | 4000 Hz | 5000 Hz |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 130 / 100 mm | 0.60 | 0.06 | 0.06 | 0.08 | 0.18 | 0.27 | 0.44 | 0.67 | 0.70 | 0.78 | 0.74 | 0.66 | 0.64 | 0.69 | 0.75 | 0.68 | 0.68 | 0.53 | 0.43 |
Measured values as a table (1 measurement)
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