The most economical of all strapping material, white polypropylene strapping is lightweight and 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 (PP) packing strap can be heat sealed with a joint efficiency of 70 to 80%. By nature, polypropylene strapping is very flexible and has the ability to mold to contours of odd-shaped or irregular shaped packages.