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: 16 in
Measurement data
Sound absorption
Reverberation chamber (ASTM C423 / ISO 354)· 2 variants
NRC
0.55
Frequency values
αp per octave band
| 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 |
|---|---|
| NRC0.55 | |
| NRC0.55 |
NRC: 0.55 (derived from ISO 354 lab data)
Weight / density: 0.7 lb/ft²
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 |
|---|---|---|---|---|---|---|---|
| 5/8 inches · 0.7 lb/ft² · 400 mm | 0.55 | 0.30 | 0.28 | 0.43 | 0.64 | 0.76 | 0.68 |
| 5/8 inches · 0.7 lb/ft² · 400 mm | 0.55 | 0.36 | 0.28 | 0.47 | 0.65 | 0.76 | 0.82 |
Measured values as a table (2 measurements)
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