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Sound Absorbing System

Alfakel M4000

Description

The sound insulating panels Alfakel Series M4000 are also known as “sandwich” panels because they are multi-layered. They effectively increase the sound insulation of various types of walls and they block noise radiated from panels or other structures mechanically stimulated.
The Alfakel M4000 sound insulating system is composed of panels made of layers of porous material interspaced with layers called “Septum” of heavy, water proof, flexible, and damping materials.
The porous layers consist of a tile made of fiber material textile based, and the “Septum” heavy layers are made of special bituminous material, loaded with high density charges and enriched with elastomers.
In its simplest form this sound insulating system is made of one heavy layer and a porous one: this is what we call a simple “sandwich”. A double sandwich is made by combining two simple elements together.
One of the great advantages of the Alfakel M is the adaptability to the shape of the surface requiring the sound insulation intervention.


Applications

The Alfakel M sound insulating system is used for industrial soundproofing when the remediation is focused on increasing the insulation against airborne noises at medium or high frequencies.
They are particularly recommended in the following cases:
– Small size enclosures for machinery and engines
– Engine casings or flat sides
– Pipes or ducts carrying fluids or dust
– Housing for ventilating fans or exhaust systems etc.

If the area to be treated requires noise damping as well, we provide ready-made panels “sandwiched” with Alfakel M damper.


Acoustic Properties

The Alfakel M sound insulating panels are extremely valid in the range of high and medium frequencies. Generally, the simple “sandwich” elements are sufficient to achieve the insulation needed, except in rare situations requiring high levels of insulation against airborne noise. By modifying the thickness of the porous layer and the weight of the heavy layer it is possible, within to a certain extent, to adjust the insulation curve to the spectrum of the noise source for the specific frequencies.
In general, increasing the thickness of the porous layer and the weight of the heavy layer will lead the curve towards low frequencies.
Figure 1 shows the range of sound insulating power of the most typical “sandwich” Alfakel M.
The range represents the difference ∆ R between the sound insulation of a 1 mm. sheet metal treated with one Alfakel M “sandwich” and one untreated sheet metal taking in consideration four samples.
"Septum" 5÷6 Kg/sq. m (3÷4 mm)
"Porous" 1.200 g. /sq. m (20 mm)


Figure 1
Alfakel simple “sandwich”
Sound insulation range

Figure 2 shows the range of sound insulating power of the most commonly used double “sandwich” Alfakel M.
"Septum" 5÷6 Kg/sq. m (3÷4 mm)
"Porous" 1.200 g./sq. m (20 mm)


Figure 2
Alfakel double “sandwich”
Sound insulation range.


General Properties

Front side:
Weight:
Thickness:
Size:
Temperature range:
Heat resistance:
Vibrations resistance:
- Tensile strength:
- Shear strength:
Gasoline and oil resistance:
Humidity resistance:
black
6,5 Kg/mq
23/25 mm.
1.230 x 1040 mm
–10 ÷ +80 °C
0.5÷1.5 mq h °C/kcal

good
medium
scarce for unprotected surfaces
good

More Benefits

– Fit well to the shape of the substrate
– Do not require safety protection of the installation team.


Installation

Alfakel M damping tiles can be glued to the surfaces to be treated for sound insulation against airborne noises or they can be applied using other techniques (such as staples, nails, metal clips, etc.).
If the “sandwich” tiles are used without the Alfakel M damping product, the porous side of the “sandwich” needs to be applied directly onto the surface to be treated, so that the “Septum” side be on the visible face. When the “sandwich” tiles are used with the Alfakel M damper, they need to be placed in direct contact with the surface to be treated.


Special Applications

In these applications the heavy side is exposed to thermal heat or solvents such as gasoline, oil, etc.


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