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Sound Absorbing Elements

B202

Description

These are modular sound absorbing panels with a vibrating membrane made of textile fiber material. The surface can have various embossed shapes formed with a heat molding process.
On one side of the surface they are finished with porous non-woven fabric.


Applications

The elements Alfakel S 202 are particularly suited for noise remediation of interiors in the civil sector where the geometric shape of the building is particularly subject to high sound reverberation.
Additionally, they are recommended for interiors with special acoustic needs such as recording studios, music halls, and anechoic chambers etc.


Acoustic Properties

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.

Figure 1 – Impact of the size of the air gap

The power of absorption of the Alfakel B 202 elements can be further enhanced by inserting in the air gap a layer of sound absorbing porous material such as Alfakel M.
The thicker is the layer of Alfakel M the higher is the absorption coefficient.
Figure 2 shows the various curves in relation to the thickness of the porous layer inserted for a distance of d=100 mm.


Figure 2 – Impact of the thickness of the porous layer inserted in an air gap d = 100 mm.


Double Absorbing Baffles

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.


Figure 3 - Absorption curve of Alfakel B202/2 baffles as function of the frequency.


General Properties

 
B 202
B 202/2
Weight
1.2 Kg./sq.m approximately
2.4 Kg./sq.m approximately
Nominal dimensions
600x1200x60 mm.
600x1200x120 mm
Strength
Good
Good
Thermal Insulation
Excellent (l = 0.033 kcal/mh °C)

Further Benefits

  • Standard elements easy to install
  • Great esthetics
  • Light weight
  • Sound absorbing surface completely visible
  • Do not contain mineral fibers or fibers considered harmful
  • Do not crystallize over time
  • Standard color are considered relaxing
  • Easy to clean with a common vacuum or water sprayed

Applications

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.


Alfakel s.r.l. • Via G. Galilei 39/D • 42027 Montecchio Emilia (RE)
Tel. 0522 86.35.23 Fax 0522 86.60.08 •
E-mail: info@alfakel.it


Alfakel
The descriptions of Alfakel’s products are merely indicative. Alfakel retains the rights to apply further modifications.



 

 



 



 


Alfakel s.r.l. • Via G. Galilei 39/D • 42027 Montecchio Emilia (RE) • P.IVA 01838090353
Tel. 0522 86.35.23 • Fax 0522 86.60.08 • e-mail:info@alfakel.it