FeltHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data
Value from the PTB table, not verified
O.R.V. Polipren T polyester fiber absorber
Polipren T
PTB reference data
Original description
O.R.V. Polipren T polyester fiber absorber
Material properties
Manufacturer: O.R.V. Ovattificio Resinatura Valpadana
Thickness: 0.8 in
Application: thermal and sound insulation, sound absorption
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)
NRC
0.75
derived from ISO 354 lab data
Frequency values
αp nach ISO 11654
| f (Hz) | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|
| αp | 0.40 | 0.65 | 1.00 | 0.95 | 1.00 |
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Value from the PTB table, not verified
NRC: 0.75 (derived from ISO 354 lab data)
Measured values as a table (1 measurement)
| Build-up | NRC | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|
| 20 mm · 100 kg / m³ | 0.75 | 0.40 | 0.65 | 0.98 | 0.94 | 0.98 |
Measured values as a table (1 measurement)
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