Broadband traps: Will this do?

[Saudade]

Ok Owens Cornings or other fibreglass brands are apparently price-prohibitive where I live. The distributor recommended Rockwool (he also distributes OC), so I asked him for some NRC specs.

How's the performance based on the chart attached? Is it suitable to use for my DIY traps? From what I compare to other materials listed in the Bob Golds site, it is pretty alright.

This one is 100kg/m3 density, they have even denser ones. Is it true "Denser = better absorption" or do I have to look at the chart to know? They also have a type with "aluminium foil face" on one side. Is this equivalent to the FRK type for OC703 which I read absorbs better than the plain unfaced type?

For FRK type I read it is better to face the foil side "into the room" for better low frequency absorption (at the risk of high frequency reflection).

Do I understand "into the room" correctly in that the foil side is facing the opposite wall (not the wall it is mounted on)?

Thanks for any help

[Glenn Kuras]

How's the performance based on the chart attached? Is it suitable to use for my DIY traps? From what I compare to other materials listed in the Bob Golds site, it is pretty alright.

I can't read the file but Rockwool will work just fine.

This one is 100kg/m3 density, they have even denser ones. Is it true "Denser = better absorption" or do I have to look at the chart to know?

For bass trapping, if the panel is 4" thick then denser rockwool will work better. Once you get past 6" you want to go with less dense.

For FRK type I read it is better to face the foil side "into the room" for better low frequency absorption (at the risk of high frequency reflection).

Yes, but you only want to use these as bass traps. For early reflections you do not want to use FRK or any fronts.

Hope that helps.

Glenn