Not for anything but it seems we do not know the effectivity of the Han Gan material as an acoustic material. I have been asking them for a lab test of their material but it seems there is none. Also, I do not know how safe it is. I guess these are things you have to ask before buying their material. Sayang and pera kasi. If you are talking about evening out the acoustic response of your room, you are better off with traditional acoustic materials such as glass fiber, wood and glass. Of course you have to understand how to combine all these elements to get the desired result.
FWIW.
sir what do you mean? yung bentang fiberglass and rockwool ng han gang hindi effective? i ordered 48kg rigid fiberglass and 80kg rigid rockwool.. please enlighten me sir..
I am not sure if Han Gang sells glass fibers or rockwool. What I know is that they make this foam type material used as heating insulation, which they also pass on as acoustic material. As I said, this material does not seem to have any acoustical tests or lab measurement results. Better confirm.
48 kgm glass fiber (BTW Fiberglass is a brand of Owens-Corning Products. The generic name is glass fiber), is good for outside acoustic surfaces, covered with acoustic textile. 68 kgm is denser, hence harder and nicer as final finish. For putting inside cavities (as in in between studs and walling), a 38 kgm, even 16 kgm glass fiber in rolls would be sufficient to keep the resonance tamed in the cavities. There is such as thing as diminishing return. As you go denser, the effect becomes lesser. So, why waste money?
As to my comments regardfing even-ing out the response of the room, you have to use the correct ratio between absorbent, diffusive and reflective finishes so the response of your room is almost flat. I like a LF boost around 250 and down at 60 Hz., but that is my preference.
FWIW