The most economical of all bulk strapping materials, polypropylene is a lightweight strapping that can be used for a variety of bundling applications. It is available in a wide variety of sizes and gauges and offers the greatest elongation of all strapping and has good initial recovery characteristics. Samuel polypropylene can be heat-sealed with a joint efficiency of 70 to 80%. By nature, polypropylene strapping rolls are very flexible and has the ability to mold to contours of odd-shaped or irregular-shaped packages.