PET strap (polyester strap) has a recommended storage life of 18–36 months under proper conditions. Temperature, humidity, UV exposure, and packaging integrity all affect how long PET strap maintains its performance.
PP strap (polypropylene strap) gains its strength through a manufacturing process called molecular orientation. During production, the extruded strap is stretched under controlled conditions, aligning polymer chains along the strap's length.
Heavy industry packaging demands strapping that holds under sustained tension, resists abrasion, and survives outdoor storage and ocean transit. PET strap (polyester strap) and polyester rope are both used for load securing, but they perform very differently. Polyester rope stretches under load, loses tension as cargo settles, and abrades quickly against sharp metal edges.