Using EPS for slat helmholtz absorber?

Hi, I am finishing the acoustics of my new studio and after the measurements I decided to lower my celling building a slat helmholtz absorber to kill the 60Hz peak I have. Because I never planned lowered celling I didn't make strong construction that can support it. So I am trying to find lighter materials to do it. Is it possible to use EPS(expanded polystyrene) for making the slat absorbers? In the theoretical readings that I could find, the mass and the density of materials used for slats is never mentioned as an issue. Mainly the absorption frequency is described as dependent of acoustic mass in this case air entrapped in the holes between and the slats and the depth of the cavity behind the slats and the percentage of the holes area. So if anyone has an idea or experiance why should I or should I not use EPS for building a slat helmholtz absorber please let me know. Best Regards, Joka :D

At first glance it sounds good. Thinking it over, it sounds good. A big concern is fire hazard. Find some material that does not burn. EPS on the ceiling is like a giant fire starter. Think of the Great White fire tragedy. Good thinking. It just needs some development. Andre

Here is a link I was able to dredge up that Eric Desart, aided with Glenns visual aids, gives an explanation on slat mass and density, among other things. I too was not certain so it helped me to understand what Andre said and why. Slat Absorbers

Thanks Andre and xSpace for your answers. Yesterday found plastic and glass bottle and I managed to make EPS box with approximate volume and neck opening as the other two. I blew across the top of an empty glass and plastic bottle and EPS box. The first two exhibit a Helmholtz effect, but the glass bottle was far more pronounced than the plastic one, but I couldn’t make EPS box sings. So I guess that the rigidity of the Helmholtz slat absorber enclosure is assumed. The additional reading suggested by xSpace confirm my findings :) Thank you all for your help and I hope this helps somebody else too. Joka :D