FeltHigh-frequency absorber
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data manufacturer
Value from the PTB table, not verified
Fiberform 62T polyester mat
Fiberform 62T
PTB reference data
Original description
Fiberform 62T polyester mat
Material properties
Manufacturer: Associazione Nazionale Produttori Elementi Leca
Thickness: 1 in, 2 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.75
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.55 | 0.80 | 0.85 | 0.80 | 0.80 |
Create a permanent free account — Access frequency bands, variants and export.
Free. No password required.
| Compare | Value | ||
|---|---|---|---|
| 2 in | 40 kg/m^3 | NRC0.75 | |
| 1 in | 30 kg/m^3 | NRC0.50 |
NRC: 0.75 (derived from ISO 354 lab data)
Measured values as a table (2 measurements)
| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 mm · 30 kg/m^3 | 0.50 | 0.08 | 0.10 | 0.15 | 0.18 | 0.25 | 0.32 | 0.38 | 0.45 | 0.48 | 0.55 | 0.58 | 0.60 | 0.62 | 0.65 | 0.68 | 0.70 | 0.70 | 0.72 |
| 50 mm · 40 kg/m^3 | 0.75 | 0.20 | 0.22 | 0.30 | 0.38 | 0.57 | 0.65 | 0.75 | 0.78 | 0.82 | 0.85 | 0.83 | 0.83 | 0.82 | 0.82 | 0.82 | 0.82 | 0.82 | 0.82 |
Measured values as a table (2 measurements)
Access frequency bands, variants and export. Create a permanent free account
Last updated:
