Element with a tearable seam, allowing the deployment of an air bag, in particular for a car seat

The component (1), e.g. a seat, incorporating an airbag (3), has a foam body (2) with a cavity (4) to receive the airbag system, and a covering (6) in two sections (7, 8) joined by a seam (9) that tears when (3) is inflated. (9) Is offset relative to (4)'s opening (10), and parts of (6) are lined with separating layers (13, 18) of an adhesive film material impermeable to the passage of the foam. The component (1), e.g. a seat, incorporating an airbag (3), has a foam body (2) with a cavity (4) to receive the airbag system, and a covering (6) in two sections (7, 8) joined by a seam (9) that tears open when the airbag is inflated, with a third section (11) beneath the cavity. The tearable seam is offset relative to the cavity's opening (10), and the second and third parts of the covering are lined with separating layers (13, 18) of an adhesive film material that is impermeable to the passage of the foam. It also has a sleeve (15) extending along at least part of the cavity's side walls.