MetalHighly 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
Perforated metal ceiling panel backed with fiberglass
IAC Mark III
PTB reference data
Original description
Perforated metal ceiling panel backed with fiberglass
Material properties
Manufacturer: Industrial Acoustics Company
Thickness: 2 inches, 3 inches
Wall distance: 16 in
Backing: fiberglass
Application: ceiling
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.95
Frequency values
αp per octave band
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.65 | 0.70 | 1.00 | 1.00 | 1.00 | 1.00 |
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| Compare | Value | ||
|---|---|---|---|
| 2 inches | 1.8 lb/ft² | NRC0.95 | |
| 3 inches | 3.1 lb/ft² | NRC1.00 |
NRC: 0.95 (derived from ISO 354 lab data)
Dimensions: 24 x 48 inches
Distance: 16 in
Measured values as a table (2 measurements)
| Build-up | NRC | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 2 inches · 1.8 lb/ft² · 400 mm | 0.95 | 0.63 | 0.71 | 0.98 | 1.11 | 1.03 | 1.08 |
| 3 inches · 3.1 lb/ft² · 400 mm | 1.00 | 0.56 | 0.84 | 1.16 | 1.16 | 0.92 | 0.82 |
Measured values as a table (2 measurements)
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