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Old 10-26-2016, 09:55 AM
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Default Some Rockwool absorption coefficients

For anyone interested:

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Old 10-26-2016, 10:18 AM
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Rick do you know if those are the ASTM C423 ratings ? it does not say
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Old 10-26-2016, 10:38 AM
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Rick do you know if those are the ASTM C423 ratings ? it does not say

http://www.atsacoustics.com/media/im...ifications.pdf
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Old 10-26-2016, 10:41 AM
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Ok it is thanks, Looks like it is ASTM C424 rating, albeit some small discrepancies ( probably different tests) from the Roxul web sight data..


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Old 10-26-2016, 10:46 AM
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Ok it is thanks, Very similar to Owens Corning 703 ratings
Yes. Less nasty stuff to work with though, especially for do it yourselfers.
Even with the rockwool, when I first put up the panels I felt it was a good idea to run a room air purifier 24 hours a day for a week.
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Old 10-26-2016, 11:14 AM
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Yes. Less nasty stuff to work with though, especially for do it yourselfers.
Even with the rockwool, when I first put up the panels I felt it was a good idea to run a room air purifier 24 hours a day for a week.
I would imagine particularly if you are cutting any of it.
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Old 10-26-2016, 11:41 AM
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ATS Acoustics has a nice comparison of the absorption characteristics for a number of materials:

http://www.atsacoustics.com/page--Se...erial--ac.html

I ended up using the Roxul Rockboard 80, 4" thickness. It's apparently better at the low end than some other materials:

Acoustical performance sound absorption co-efficients to ASTM C423.
Sound Absorption Co-efficiences at Frequencies
Thickness (inches) 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz NRC
1_______________0.11__0.31___0.82___1.01___1.02___ _1.01____0.80
1.5_____________0.21__0.64___0.92___1.00___0.95___ _1.01____0.90
2_______________0.43__0.78___0.90___0.97___0.97___ _1.00____0.90
3_______________0.75__0.82___0.89___0.94___1.00___ _1.00____0.90

(sorry, I didn't know how to insert the table and keep the formatting)
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Old 10-26-2016, 11:52 AM
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Originally Posted by ChuckS View Post
ATS Acoustics has a nice comparison of the absorption characteristics for a number of materials:

http://www.atsacoustics.com/page--Se...erial--ac.html

I ended up using the Roxul Rockboard 80, 4" thickness. It's apparently better at the low end than some other materials:

Acoustical performance sound absorption co-efficients to ASTM C423.
Sound Absorption Co-efficiences at Frequencies
Thickness (inches) 125 Hz 250 Hz 500 Hz 1000 Hz 2000 Hz 4000 Hz NRC
1 0.11 0.31 0.82 1.01 1.02 1.01 0.80
1.5 0.21 0.64 0.92 1.00 0.95 1.01 0.90
2 0.43 0.78 0.90 0.97 0.97 1.00 0.90
3 0.75 0.82 0.89 0.94 1.00 1.00 0.90

(sorry, I didn't know how to insert the table and keep the formatting)
Ya I don't know how to format charts either so I just do a screen shot and then import into photobucket.

But yes the more inches the more t lower freq's are absorbed. Which is also why some bass traps are designed to fit a 45 degree angle to fit into corners and at floor and ceiling seams and be thicker right at the seam
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