In terms of material essence, the polyester fiber used in the lift polyester sling features stable molecular chain structure. The single filament tensile strength can reach 8-9 cN/dtex, and the elongation at break is controlled between 20% and 30%. This enables the sling, which is twisted or woven from multiple strands of fiber, to not only bear rated loads of up to several tons (common specifications range from 1 ton to 50 tons) but also maintain moderate elastic deformation during hoisting, acting like a buffer pad to reduce the impact load when lifting heavy objects. Compared with nylon slings, polyester fiber has stronger acid resistance, with a performance attenuation rate of less than 5% in an environment with a pH value of 4-9, making it particularly suitable for use in scenarios such as chemical workshops where there are mild corrosive media. In contrast to steel wire ropes, its non-metallic structure completely avoids scratch damage to the surface of hoisted objects (such as precision instrument casings and polished metal plates) during hoisting. When the polyester fiber of the lift polyester sling, with a surface smoothness of Ra0.8μm or lower, comes into contact with the hoisted object, the friction coefficient is only 0.2-0.3, which is much lower than the 0.6-0.8 when steel contacts steel.
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