Synthetic fiber sling has the advantages of light weight, high strength, wide bearing surface, good flexibility, smooth surface, not easy to damage the surface of lifting objects, and so on. It is light to carry, easy to maintain and has good chemical stability. Synthetic fiber sling can provide a wide bearing surface, which can reduce the pressure of the contact surface with the object to be hoisted, and protect the object to be hoisted. If necessary, it can also be used with a wider protective cover, because there is no metal contact, the damage caused to the smooth and painted surface of the object being lifted is very slight. Synthetic fiber straps are widely used in port terminals, nuclear power, wind power, chemical, steel, machinery and other industrial fields. According to the shape, synthetic fiber sling can be divided into circular eye type synthetic fiber sling and ring type synthetic fiber sling. According to different lifting environmental requirements, synthetic fiber sling can be divided into: ordinary type, fireproof type, fluorescent type, high-strength type, acid-resistant type, wear-resistant type, oil-repellent waterproof type and other product series. According to customer requirements, the synthetic fiber sling can be assembled into non-standard spreader with the lifting ring, lifting hook, shackle, universal lifting ring, etc. Synthetic fiber straps are mainly made of polypropylene fiber, polyester fiber, polyamide fiber, they have their own characteristics, suitable for different working environments, but different materials of lifting belts can not be mixed. Polypropylene fiber synthetic fiber sling is almost free from acid and alkali attack, suitable for use in the environment of enhanced chemical corrosion; Polyester synthetic fiber sling can resist most inorganic acids, but not alkali; Polyamide fiber synthetic fiber sling is alkali resistant, but susceptible to inorganic acid attack. The color and bandwidth of synthetic fiber slings with different rated loads are different, and the rated load of synthetic fiber slings can be distinguished by color and bandwidth.