Mineral woolHighly 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
Armstrong Minatex surface-textured mineral fiber lay-in panel
Type 775
PTB reference data
Original description
Armstrong Minatex surface-textured mineral fiber lay-in panel
Material properties
Manufacturer: Armstrong World Industries
Thickness: 5/8 inch
Wall distance: 400 mm
Measurement data
Sound absorption
ISO 354 – reverberation chamber· 2 variants
αw
0.50
Frequency values
αp per ISO 11654
| f (Hz) | 125 | 250 | 500 | 1k | 2k | 4k |
|---|---|---|---|---|---|---|
| αp | 0.30 | 0.30 | 0.45 | 0.65 | 0.75 | 0.70 |
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| Compare | Value |
|---|---|
| αw0.50 | |
| αw0.50 |
Weight / density: 0.7 lb/ft²
Dimensions: 24 x 48 inches
Distance: 400 mm
Measured values as a table (2 measurements)
| Build-up | αw | 125 Hz | 250 Hz | 500 Hz | 1000 Hz | 2000 Hz | 4000 Hz |
|---|---|---|---|---|---|---|---|
| 5/8 inches · 0.7 lb/ft² · 400 mm | 0.50 | 0.30 | 0.28 | 0.43 | 0.64 | 0.76 | 0.68 |
| 5/8 inches · 0.7 lb/ft² · 400 mm | 0.50 | 0.36 | 0.28 | 0.47 | 0.65 | 0.76 | 0.82 |
Measured values as a table (2 measurements)
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