Sound absorbing coating
The sound absorption characteristics of acoustic materials are based also on the size of the air gap between the type of paneling being considered and the ceiling or the wall.
Figure 1 shows the absorption curves of the Alfakel B 208 elements, as function of the frequency, for various distances of the elements from walls or ceiling.
Volume of the reverberating chamber:
|Surface examined:||7.2 sq. m in projection|
|Type of sound:||white noise in 1/3 of octave|
Fig. 1- Impact of the size of the air gap.
To create a double absorbing surface, 2 Alfakel B 208 panels can be bonded together. They are called “Baffles B 208/2” and they are used for practical reasons (for example, in consideration of the existing lighting system) or to meet particular acoustic requirements.
In fact, the hanging Baffles B 208/2 for the same surface of absorption, yield same or higher values of absorption for the surface treated.
Figure 3 shows the Baffles B 208/2’s absorption curve as function of the frequency.
Fig. 3 – Baffles B 208/2’s absorption curve as function of the frequency.
|B 208||B 208/2|
|Weight:||Kg. 1,00||Kg. 2,00|
|Nominal dimensions:||600x1200x75 mm.||600x1200x150 mm.|
|Surface of absorption:||mq. 0,72||mq. 1,44|
|Thermal insulation:||Excellent (l = 0,033 kcal/mh °C)|
Class 1 (Certificate LSF/U 1403880 of 15-05-87)
The Alfakel B 208 elements, as sound absorbing paneling for walls or ceilings, can be installed with traditional methods, such as profile frames either lengthwise or vertically, nailed on wooden strips or directly onto the walls. Installed with the correct frame, the panels can be mounted to attain the appropriate air gap desired.
The Baffles Alfakel B 208 can be hung from the ceiling on hooks, metal bars, etc. and anchored onto existing structures.