Absorption
Any sound energy, which, upon striking a material is not reflected back is said to be absorbed. Sound reflected back or reverberated from a material causes acoustic problems. Materials designed for the purpose of absorbing sound energy will limit this reflected sound energy. Rockfon absorbing materials have excellent sound reverberation controlling properties.
| Frequency (Hz) | 125 | 250 | 500 | 1000 | 2000 | 4000 |
|---|---|---|---|---|---|---|
| * Screen Solutions acoustic screens. | ||||||
| # Rockfon ceiling tiles. | ||||||
| Please note: Screen Solutions Additions Acoustic screens have been measured using an Equivalent Sound Absorption Area Test. Report No. L/2960. | ||||||
 Rockfon tiles# |
0.50 | 0.75 | 0.80 | 0.85 | 0.95 | 0.90 |
 Additions screens* |
0.11 | 0.35 | 0.75 | 1.01 | 1.04 | 0.93 |
 Furniture |
0.10 | 0.20 | 0.30 | 0.35 | 0.35 | 0.40 |
 Double glazing |
0.10 | 0.07 | 0.05 | 0.03 | 0.02 | 0.02 |
 Stone/linoleum |
0.02 | 0.02 | 0.05 | 0.05 | 0.05 | 0.07 |
 Carpet |
0.01 | 0.02 | 0.05 | 0.15 | 0.30 | 0.40 |
Hard surfaces like glass, concrete, wooden flooring and marble are all used extensively in modern fashionable interiors for their aesthetic qualities. Unfortunately the property they do not possess is absorption. These spaces, unless carefully designed and furnished, reverberate sound, making noise levels rise as the space fills up with people all trying to communicate.
Spaces used for video and telephone conferences constructed from these hard materials make it very difficult for the call recipient to understand the conversation. This is due to the high reverberation levels coupled with the sensitivity of the equipment's microphone.
The sound absorption coefficient of a material can have a value between 0 and 1, with 0 representing no absorption and total reflection, and 1 representing total absorption of all the incident sound.
