Stopping device and container comprising such a device

A stopping device for a container provided with a neck, said device comprising a stopper and a plastic cap able to cover both the neck and the stopper placed in that neck, the cap comprising a ring, capable of surrounding the stopper and the neck in the mounted configuration and provided with means for locking on the neck, as well as with a cover, wherein

• the ring and the cover are made as a single component,
• the ring and the cover are connected by at least one part that is breakable using a force parallel to a central axis of the ring and oriented toward the stopper, and
• the cover is equipped with an element bearing against the stopper,
• wherein
• the breakable part is formed by bridges that extend radially between an outer radial edge of the cover and an inner radial edge of the ring, and
• an arc-of-circle-shaped lumen is defined between two adjacent bridges, along the outer radial edge of the cover and the inner radial edge of the ring, and wherein said lumen has a radial width smaller than 0.3 mm and an axial height greater than 0.15 mm.