Keldax® resins are filled, ethylene-based polymers that provide acoustical sound barrier performance in automotive and other applications. In automotive carpets, the ability to thermoform Keldax® resins allows manufacturers to pre-shape ready-to-install, mass-backed carpets that speed automotive assembly. Other applications include sound barriers in automotive door panels, to shield passengers from roadnoise, and sandwiched flame-resistant architectural panels, where sound deadening contributes to perceived higher quality performance.