| Re: Rock wool vs. Acoustic cotton vs. OC703
I think that most Standard test procedures actually require the edges to be blanked off. The reason for getting abs coeff over 1.00 is more to do with the limitations of the Sabine formula assumptions.
I'd also be cautious about comparing test results from different labs and possibly different test standards.
Is there a link for more info on "acoustical cotton"? I am interested in the concept of recycling cotton since it requires so much water to produce in the 1st place. I'd be a bit concerned about its fire performance though.
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