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 202 elements, as function of the frequency, for various distances of the elements from walls or ceiling.
Fig.1 – Impact of the size of the air gap.
Fig. 2 – Impact of the thickness of the porous layer inserted in an air gap d = 100 mm.
To create a double absorbing surface, 2 Alfakel B 202 panels can be bonded together. They are called “Baffles B 202/2” 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 202/2 for the same surface of absorption, yield same or higher values of absorption for the surface treated. The Baffles B 202/2 can be hung individually or assembled in banners or grids.
Figure 3 shows the Baffles B 202/2’s absorption curve as function of the frequency.
Fig. 3 – Absorption curve of Alfakel B202/2 baffles as function of the frequency.
|B 202||B 202/2|
|Weight:||1.2 Kg./sq.m approximately||2.4 Kg./sq.m approximately|
|Nominal dimensions:||600x1200x60 mm||600x1200x120 mm|
|Thermal Insulation:||Excellent (l = 0.033 kcal/mh °C)|
The Alfakel B 202 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 202 can be hung from the ceiling on hooks, metal bars, etc. and anchored onto existing structures.