FoamHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: Manufacturer data: www.schalltechnik-mm.de
Value from the PTB table, not verified
Büro f. Schalltechnik BBA Plus 120 foam absorber
BBA Plus 120
PTB reference data
Original description
Büro f. Schalltechnik BBA Plus 120 foam absorber
Material properties
Manufacturer: Büro f. Schalltechnik
Thickness: 4.7 in, 9.4 in
Backing: resonance absorber
Surface: open-cell flexible foam
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
1.00
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.35 | 0.85 | 1.00 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | |
|---|---|---|
| 4.7 in | NRC1.00 | |
| 9.4 in | NRC1.10 |
NRC: 1.00 (derived from ISO 354 lab data)
Weight / density: ca. 1 kg / Element (0,6 m²)
Dimensions: 1000 x 600 x 4.7 in
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 120 mm · ca. 1 kg / Element (0,6 m²) · offenzellig | 1.00 | 0.20 | 0.40 | 0.49 | 0.62 | 0.84 | 1.06 | 1.16 | 1.12 | 1.09 | 1.07 | 1.03 | 1.04 | 1.00 | 1.01 | 0.99 | 1.02 | 0.98 | 0.95 |
| 240 mm · offenzellig | 1.10 | 0.74 | 0.91 | 1.33 | 1.25 | 1.15 | 1.10 | 1.05 | 1.08 | 1.05 | 1.06 | 1.07 | 1.09 | 1.07 | 1.10 | 1.08 | 1.07 | 1.05 | 1.08 |
Measured values as a table (2 measurements)
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