FoamHighly absorbent
Data source
PTB reference data
Physikalisch-Technische Bundesanstalt
Source: C.M.Harris, Noise Control in Buildings, McGraw Hill 1994
Value from the PTB table, not verified
Imi-Tech Solimide Ac-403 polyimide foam
Ac-403 – Solimide
PTB reference data
Original description
Imi-Tech Solimide Ac-403 polyimide foam
Material properties
Manufacturer: Imi-Tech Corp.
Thickness: 2 inch
Wall distance: 0 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.85
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.25 | 0.50 | 0.95 | 1.00 | 0.95 | 0.95 |
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| Compare | Value | |
|---|---|---|
| 0.25 lb/ft² | NRC0.85 | |
| 0.5 lb/ft² | NRC0.80 |
NRC: 0.85 (derived from ISO 354 lab data)
Dimensions: 96 x 96 inches
Distance: 0
Measured values as a table (2 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 2 inches · 0.25 lb/ft² · 0 | 0.85 | 0.23 | 0.51 | 0.96 | 1.04 | 0.93 | 0.96 |
| 2 inches · 0.5 lb/ft² · 0 | 0.80 | 0.30 | 0.49 | 0.89 | 0.97 | 0.84 | 0.88 |
Measured values as a table (2 measurements)
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