av Per_Kele » 2013-12-06 16:24
Mejlade tillverkaren och fick ett mer utförligt svar än jag hade hoppats på, schysst. Ett utdrag från mejlet, nedre delen av texten handlar så vitt jag förstår om ljuddämpning, men det kan ju också vara intressant (Formateringen av texten ser ju kass ut, svårt att få det att se vettigt ut här men... ):
"Our insulation is used in professional loudspeaker systems.
There have also been positive experiences reported on Swedish and other language internet fora about our products used in acoustic insulation and absorption applications as an alternative for mineral & glass wool and PUR based products.
Biggest reason for people to look for this alternative seems to be to avoid allergic reactions due to small air-suspended glass/mineral particles and/or out-gassing after installation.
Other than that, for thermal insulation products:
Acoustical performance according EN ISO 11654 and EN ISO 354.
Practical sound absorption degrees (αp) over six octave ranges:
Thickness Frequency
125Hz 250Hz 500Hz 1000Hz 2000Hz 4000Hz
50mm 0,20 0,45 0,70 0,80 0,90 0,95
100mm 0,65 0,75 0,75 0,85 0,90 0,95
150mm 0,80 0,90 0,90 0,90 0,90 1,00
For 50mm thickness:
Rated sound absorption degree, single value over the entire frequency range (αw): 0,70.
Sound absorption class C with overall system-depth of 0mm (directly mounted on the room surface, without air-gap or other layers).
For 100mm thickness:
Rated sound absorption degree, single value over the entire frequency range (αw): 0,80.
Sound absorption class B with overall system-depth of 0mm (directly mounted on the room surface, without air-gap or other layers).
For 150mm thickness:
Rated sound absorption degree, single value over the entire frequency range (αw): 0,90.
Sound absorption class A with overall system-depth of 0mm (directly mounted on the room surface, without air-gap or other layers).
To achieve excellent acoustical damping in a metal stud or wood-based partition wall structure, a combination of the flexible low-density Isolina linen insulation material with a rigid high mass material (such as the two gypsum board plates) can be successfully employed. Such a sandwich provides suitable soundproofing since it combines the individual sound-reducing performances of all the elements that make up the structure.
For example, a wished Rw=44 dB for internal (partition) walls can be achieved by employing 50mm thick insulation and 13mm gypsum plates on both sides, the 25mm small air-gap can be left between the insulation and one of the gypsum plates (total system width 101mm).
With 13mm gypsum plates on each side, a Rw=54dB value could be reached with the use of 150mm flax insulation in-between with an air-gap of 50mm between the insulation and one of the gypsum plates (total system width 226mm).
Alternatively, the same Rw=54dB figure corresponds with the outside wall structure as shown on the attached photo in the case of 200mm flax insulation (total system width 280mm) as well.
Above figures are indicative measurements conducted by a student in acoustics based on standard thermal insulation products.
For felt products:
Walking-noise attenuation:
Reduction of impact sound pressure level, weighted over 315 – 2500 Hz (ΔLw) = 20dB / linear over 100 – 2500 Hz (ΔLlin) = 10dB measured in accordance with EN ISO 140-8 and rated in accordance with EN ISO 717-2.
EXECUTION OPTIONS:
The thick blankets (rolls) or plates (used for ambient noise insulation) are not suitable for heavy weight-loading in case they have to “come back into shape” again. Standard density of these products is around 25kg/m3 for thicknesses 50-150mm.
We have similar airlaid products with thicknesses from 10-50mm at densities of 25-35kg/m3 as well.
Of course, more layers can be combined and/or layer(s) can be compressed within a frame or by means of an acoustical textile cloth (for an example see the photo attached; panel is not yet available commercially) to reach higher densities in order to improve acoustical attenuation of the lower frequency ranges.
The thinner felt products (used for contact noise insulation) that are available in 6 and 8mm thick are able to accept heavy weight loading and feature densities of 60 up to 100kg/m3."
Jag har jämfört med några köpabsorbenter och de verkar vara aningen effektivare men deras värden är oftast angivna med luftspalt vilket inte är fallet här så jag antar att linisolering skulle fungera ungefär lika bra.
