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Sound Absorption: polyurethane foam 2in
Sound absorption coefficients and NRC ratings for building materials — fiberglass, carpet, concrete, drapery, ceiling tile, etc. per ASTM C423 and ASHRAE Ch.49
| material | product variant | alpha 1000 (dimensionless) | alpha 125 (dimensionless) | alpha 2000 (dimensionless) | alpha 250 (dimensionless) | alpha 4000 (dimensionless) | alpha 500 (dimensionless) | category | description | mounting | nrc (dimensionless) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| polyurethane foam 2in | open cell 2in | 0.81 | 0.06 | 0.9 | 0.25 | 0.91 | 0.56 | specialty | Open-cell polyurethane foam (Sonex-type) 2 in thick | Type A | 0.63 |
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