Sound Insulation

Materials

When we talk about sound insulation material, we are broadly speaking of Sound insulation and sound absorption material.

When a sound wave hits a material, part of the energy is reflected, another part is absorbed in the material and a third fraction is transmitted. The sound absorption coefficient a is the ratio of the absorbed sound energy to the incident sound energy. Sound insulation is the degree to which sound is prevented from penetrating another space.

Sound absorbing materials eliminate sound reflections. They are generally porous, with many pathways that redirect sound and cause it to lose energy. Typical sound absorbing materials are fiberglass, rock wool, open cell polyurethane foam, cellular melamine foam, heavy curtain blankets and thick fabric wall coverings.