Inflatable Rubber Culvert Balloon, Packaging Type : Black

The inflatable mandrel is also called the bridge inflatable mandrel. The rubber inflatable mandrel is a cylindrical bag that can be expanded and contracted. It is made of vulcanized rubber and fiber reinforced layers. It has high tensile strength, elasticity and air tightness. It is used to form the cavity of the concrete component. When the hollow component is manufactured, it is placed in the middle and filled with compressed air. After inflation and expansion, it has enough strength to withstand the pressure of the concrete and can replace the original wooden mold and bamboo mold and steel mold, the capsule will shrink when the valve is opened, and the capsule can be withdrawn from the cavity.