Rubber
Inflatable components are manufactured from a composite of rubber and nylon or polyester. At least 3 layers of fabric are incorporated to give the required tensile strength. Other components can be included for additional security (e.g. wire mesh, cover sheets or steel cord). The products are manufactured with a minimum safety factor of 8 and in accordance with strict industry standards.
The picture shows a cross-section of a 6-ply nylon, 20mm rubber bladder for a 4-metre high steel gate system. 