Insulation according to AS4859.1, the normal size we export to
Australia now is 185mm thickness, wideth 430mm or 580mm, the lengh
at 1160mm, R: 3.5, 11KG per square meter.
What is Glasswool insultation ?
Glass wool glass fibers belonging to a category, is a man-made
With quartz sand, limestone, dolomite and other natural minerals as
main raw material, with a number of soda ash, borax and other
chemicals into the glass melt.
In the melt state, the use of standard external blow thrown into
fine fiber floc, fibers and fibers for the interchange, stick
together, showing many of the small gap.
This gap can be regarded as void.
Therefore, the glass wool can be regarded as porous materials with
good heat insulation, sound absorption performance.
Internal structure of glasswool
Centrifugal glass wool fluffy staggered within the fiber, there is
a large number of small pores, is typical of porous sound-absorbing
material, has good sound absorption properties.
Centrifugal glass wool can be made into wall, ceiling, space
absorber, could be a substantial absorption of sound within the
room can reduce the reverberation time, reducing interior noise
Centrifugal glass wool sound absorption characteristics not only
with the thickness and bulk density, but also with overlay
materials, structures and other factors.
In construction applications need while taking into account cost,
aesthetics, fire, moisture, dust, anti-aging and other various
Centrifugal glass wool sound-absorbing materials are porous, have
good sound absorption properties.
Centrifugal glass wool sound absorption is not due to surface
roughness, but because a large number of internal and external
connectivity of the small pores and cavities.
When sound waves when incident to the centrifugal glass wool,
acoustic energy into the material along the pore inside the gap
caused by the vibration of air molecules.
Because the viscosity of air resistance and air molecules and pore
wall friction, sound energy into heat and wear and tear.
Centrifugal glass wool in the high frequency of the sound
absorption properties are better.
Centrifugal glass wool sound absorption properties affect the main
factor is the thickness, density and air flow resistance and so on.
Density is the weight of material per cubic meter.
Air flow resistance is the unit thickness of material on both sides
of the air pressure and air flow ratio.
Air flow resistance, centrifugal glass wool sound absorption
properties that affect the most important factor.
Flow resistance is too small, indicating material sparse, easily
through the air vibration, acoustic performance degradation; flow
resistance too, shows dense material, difficult to pass the air
vibration, acoustic performance also decreased.
The centrifugal glass wool is concerned, there exists an optimum
flow resistance, sound absorption properties.
In practical engineering, the determination of air flow resistance
is difficult, but the thickness and bulk density can be roughly
estimated and control.
1, with the thickness, the low frequency sound absorption
coefficient significantly increased, but little change in frequency
(high frequency absorption is always larger).
2, the same thickness, bulk density increased, the low frequency
sound absorption coefficient has also increased; but bulk density
increased to a certain extent, the material becomes dense, flow
resistance than the optimum flow resistance, sound absorption
coefficient of the worse.
The thickness of the bulk density of more than 5cm to 16Kg/m3
centrifugal glass wool, low-frequency 125Hz is about 0.2, the high
frequency (> 500Hz) of the absorption coefficient is close to 1
Continue to increase when the thickness 5cm, the frequency of the
absorption coefficient increased gradually, when the thickness is
more than 1m above, the absorption coefficient of frequency 125Hz
will be close to 1.
When the thickness is constant, bulk density increases, the
centrifugal low-frequency sound absorption coefficient glass wool
will continue to increase, when the bulk density close to the
maximum absorption properties when 110kg/m3, 50mm thick, frequency