ACOUSTIC INSULATION AND SOUNDPROOFING
INSULATION (db)
Acoustic insulation
between two rooms separated by a wall is defined as the difference between the level of
sound pressure in the room where the source of the sound is located, and the level of
sound pressure in the adjacent room.
Highlighted here is the
SIX ITALIA product A 199 FOIL panel produced in two variations with a weight of 5 ± 10 %
Kg/m² or 8 ± 10 % Kg/m² .
ACOUSTIC ABSORPTION OR SOUND ABSORBING
MATERIAL ( œ )
Wherever sound is dispersed, the acoustic wave
is subject to absorption. This can be either :
- absorption of the propagation means, which is generally
negligible in closed areas.
- superficial absorption: defined by what is produced when a
wave hits a surface and is partially reflected and partially absorbed.
In the case of closed environments,
absorption occurs on all the surfaces that surround it.
Absorption is expressed through the
ratio between the part of sound energy that is absorbed and the total incident energy.
This parameter is called absorption
coefficient œ, which always has a value of less than 1 and the smaller the number,
the less reflective the surface.
The principal whereby fibre panels
absorb sound energy is absorption by porosity.
Fibre panels have the ability to
transform incident sound energy into heat, via friction inside the micro-cavities between
the fibres.
The most widely used thermal and
acoustic insulation materials are panels in glass wool or rock wool; this follows up on
the new ministerial decree issued 1 September 1999, implementing the EEC directive
97/69/EC that attributes a new system of classification for defining the toxicity of
inorganic fibres.
SIX ITALIA has perfected some panels
in organic fibres that correspond to the note "R" of the ministerial decree.
These are quite advanced products;
here some superior products are the SIX TH 2020, SIX TH 2460 panels.
Where characteristics of
incombustibility are not required, SIX ITALIA offers a wide range of panels in organic
fibres with a low propensity to spread flames and low smoke emission.
Some of these products are SIX TH 2459, NITRA, SIX TH 2021.
download technical card SIX TH
2459
download technical card NITRA C
SOUND MUFFLING
These cover :
SIX ITALIA has
perfected a product called "SIR A 198", a muffling material necessary where
there is mechanical stress on materials.
The SIR A 198 is a
blend of plastic polymers, in an aqueous solution with organic and mineral extenders, that
transforms mechanical energy into heat.
download technical
card of SIR A 198
download technical card of ATR3
USE
- On surfaces where the breadth of the resonance must be
reduced.
- On surfaces where the duration of an unexpected mechanical
stimulus must be reduced.
- To increase the soundproofing of surfaces in areas of the
frequency of resonance.
The application
thickness of muffling material depends on the muffling values that need to be obtained.
SIR A 198
provides high levels of muffling with thicknesses much lower than those necessary with the
other mufflers on the market.
To treat metallic
surfaces, the application ratio is as follows:
Thickness
SIR A 198
---------------------------------------------- = 0.8 ÷ 2
Thickness of the metallic support
In any case, the thickness of the
film when dry must not be lesser than 0.8 mm.
The muffler with a free layer can be
applied on non-metallic supports, for example: masonite, chipboard, plastic laminates, or
fibreglass.
For metallic supports having greater
thicknesses, it is recommended to intervene with the muffling system with a bound layer
ATR V 213 ; this system reduces the application ratio of the muffling system with a free
layer making the operation more economical. |
