CP insulating sheets from SINTEC are composed of an EPDM rubber flexible polymeric base with additives of mineral loads, which provide a high density material. These features make the CP sheets the perfect choice in most of the multi-layer compounds used for soundproofing. CP sheets are attached to other materials in order to increase the mass and, consequently, the insulation of vertical and horizontal elements. Another feature of this material is its capacity to remove the typical frequencies from other materials, thus increasing its acoustic performance. For this reason it is usually combined with other materials such as laminated plasterboard, steel plates or other materials, in order to complement its characteristics for soundproofing.