It is most commonly used in steel service centers, rail car applications and heavy construction applications. Polyester Strapping Polyester is the most rigid of all strapping materials. It elongates significantly less than polypropylene and retains tension over a longer period. Polyester is nick resistant and can be sealed with seals, heat or friction welds. Because polyester offers the greatest strength and highest retained tension of all plastic strapping, it is frequently used on heavy duty loads that need high initial tension along with high retained tension during handling and storage.
Common applications are empty cans and bottles, lumber and heavy, rigid palletizing.
Polyester has a smooth, shiny finish and is easy to dispose of and recycle. Polypropylene Strapping Polypropylene strapping is the most commonly used and least expensive of all strapping materials. It is light and easy to apply and recycle. Characteristics include high elongation and elongation recovery, but low retained tension. Polypropylene is an excellent choice for light duty palletizing, unitizing, carton closing and bundling.