Europa-List: Re: Cork insulation for noise reduction

["dmac7" <dmac7@outlook.com>]

--> Europa-List message posted by: "dmac7" <dmac7@outlook.com>

Doing a small amount of research we learn that there are two ratings of 
interest when considering a material for sound control, NRC Noise Reduction 
Coefficient = sound absorption Cork said to be 0.7 NRC means 70% absorbed 30% 
reflected at specific frequencies 250, 500, 1000, 2000 HZ
STC Sound Transmission Class = ability to block noise, Cork said to be 89  that 
makes Cork rather unique it both blocks and absorbs noise, perhaps this is why 
it passed the lab testing at Airbus so successfully.

I came across a article from 16 years ago on airliners.net saying the next step 
for airbus was a two year test in the fuselage of one of their jets with Cork 
insulation. 
Then one must decide the best locations to place it, top cowl & firewall to 
start I suppose.




Read this topic online here:

http://forums.matronics.com/viewtopic.php?p=511391#511391






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