[bpape]

While I'm sure the Insulco will be fine, I wouldn't make the determination based solely on that 125Hz number. Something looks odd in that chart. If you go out and physically look at the data sheet, the 25mm looks significantly worse compared to 703. Then the 50 and 75mm look almost identical at 125Hz. I'm wondering if it's a misprint or just an abberation of the particular test.

Normally, there's a somewhat reasonable progression as you move from 25 to 50 to 75 to 100mm. Also, just from personal experience, even the best unfaced materials would have a really hard time doing .41 at 125Hz. Best I've ever used/seen is the 3lb acoustical cotton. It's only .35 at 125Hz.

The Supertel numbers quoted are much more consistent with 50mm fiberglass/mineral glass board of that density.

Bryan