Most, but not all. Our dividers aren’t soundproof; they are sound absorbing.  Soft, porous materials will absorb Sound. So surfaces such as a Screenflex panel, which is made of a corrugated core covered by two layers of fiberglass mat and a fabric covering, help absorb a lot of sounds. If you need more convincing, here’s a link to some technical information, Noise Reduction Coefficient and a video showing how our product absorbs sound.