inflated rubber balloon for culvert casting road construction

PNEUMATIC RUBBER MANDREL Pneumatic rubber mandrel, also called culvert balloon, is used for making concrete pre-casting formwork projects in culvert bridge construction. Nigeria dia600mm inflatable rubber balloon for culvert construction (600mm diameters) Material of pneumatic rubber mandrel: Pneumatic rubber mandrel is made from natural rubber and fabric. In general, rubber balloon is formed by three layers(1+2=2layers of rubber and 1 layer fabric): inner layer is high