👉 A foam weapon is an improvised explosive device (IED) constructed using expanded polystyrene foam, a lightweight and shock-absorbing material. The foam is typically packed into a tube or container, which is then attached to a detonator or a secondary explosive charge. When the device is triggered, the foam absorbs much of the initial impact and pressure, allowing the explosive charge to detonate more effectively. This design makes foam weapons particularly dangerous as they can cause severe injuries due to the foam's ability to expand rapidly upon impact, creating a powerful shockwave and potentially causing secondary explosions from the packed foam.