Acoustic material:
Any material considered in terms of its acoustical properties. Commonly and especially, a material designed to absorb sound.
It is particularly suited to the following developments:
• Luxury apartments
• Penthouses
• Hotels
• Schools
• Hospitals
• Libraries
• Retail
• Music studios
Features & benefits:
•Excellent impact and airborne performance
•Offers long term performance without collapse or
“bottoming” out under high point loads
•Quick and easy to install with no need for separate
perimeter strips
•Minimises construction heights
•Supplied in easy to handle sheets
•Mildew and moisture proof
•Zero global warming potential (GWP) and zero ozone
depletion potential (ODP)
Technical Information:
Sheet length = 2250mm
Sheet width = 1150mm
Material thickness= 5mm
Density =720kg/m3
Tensile strength (DIN 53571) =approx 0.5N/mm2
Thermal conductivity approx =0.14W/mK
Elongation at break approx. =75%
Temperature resistance =-40ºC to +110ºC
Airborne sound insulation (DnT,w + Ctr) = 49dB
Impact sound insulation (L’nT,w (Ci)) =46dB
LW (impact improvement) =20dB (BS EN ISO 140-8:1998)
Remember this technical information only for 5mm thick acoustic layer.
 | |
| acoustic |
Acoustic impedance
Acoustic impedance: Z=R+jX ; [ML-4T-1] ; mks acoustic ohm *(Pa•s/m3) ---of a surface, for a given frequency, the complex quotient obtained when the sound pressure averaged over the surface is divided by the volume velocity through the surface. The real and imaginary components are called, respectively, acoustic resistance and acoustic reactance.http://en.wikipedia.org/wiki/Acoustic_impedance
ReplyDeleteFloor insulation guide
When looking at floor constructions, two major aspects need to be considered. These are both the airborne and impact sound insulation performance. Indeed, Building Regulations Approved Document E requires floors to be tested for these two types of noise transmission.
The overall sound insulation performance rating of a floor is the end result of the floor’s individual airborne and impact sound insulation indices.
A properly constructed floor system should therefore satisfy both types of sound insulation with the right choice of materials and proper installation and fitting.
Impact noise isolation
The most effective method of reducing impact noise (i.e. noise generated from footfall) is to install an element offering a good degree of resilience, so that the impact energy is absorbed. There are many types of treatments for impact sound, including:
Soft floor coverings
Resilient battens
Resilient cradle systems
Platform floors
Most of the above systems would also contribute to the improvement of airborne sound insulation. Generally, when installing a resilient floor treatment care should be taken not to puncture or bridge the layer by laying it on sharp floor surfaces or mechanically fixing (nails, screws) to a subfloor decking.
Soft floor treatment
Soft floor coverings are the most practical way to improve the impact sound insulation performance of a floor. Carpet underlays are usually confused with bonded soft floor layers, however the latter are more sturdy and present a significantly better acoustic performance. Thicknesses vary from approximately 4mm to 22mm in thickness and they are usually fixed by adhesive bonding.