پالئیےسٹر ويبنگ سلنگ.

Last updated 28 October 2026 · reviewed against EN 1492-1

The default sling for anything finished, painted or machined: a polyester flat webbing sling spreads its load over width instead of concentrating it on a hook, stretches no more than 3 %, and states its capacity in the colour of the weave.

What it is, in engineering terms

Polyester yarn is woven into a flat band, the band is folded or stacked into plies to reach the required break, and the ends are either looped back and stitched into an eye or woven closed into an endless loop. The stitch pattern is the joint: it puts the load into shear across the full width rather than into the last row of thread.

Two properties make it the standard choice. It is soft, so it bears on the load over the full band width instead of marking it. And it is stiff in extension — 3 % at WLL against 8–10 % for nylon — so a pair of slings stays level and a height-critical pick stays predictable.

Working load limit by width

The capacity of a polyester webbing sling is set by the cross-section of load-bearing yarn, which is width × plies. The table gives the conventional single-ply range; anything above it is built in multiple plies of the same width.

Capacity by hitch: the number that is not on the tag

The tag gives one figure, for a vertical lift. Every other arrangement derates it, and this is where most site errors start — a 5 t sling choking a 4.5 t load is an overload, not a margin.

The colour is the capacity

IN 1492-1 assigns a colour to each WLL, which is the fastest inspection on site: if the band is yellow it is 3 t, whatever the paperwork says. Above 10 t no colour is assigned, because the band becomes too wide for colour alone to be reliable — there the label and the set record carry it.

Eye types and builds

• Eye and eye — an eye at each end, the most common build; the eye is sized to the shackle or hook it will sit in, not to the band. See the eye and eye flat web sling.
• Endless — a closed loop with no stitching at the load path, used where the sling must be passed around the load. See endless lifting web slings.
• Reverse eye — the eye turned through 90° so the band lies flat against a corner; the build for a load with square edges.
• Sleeved eye — a heavier cover over the eye, the wear part that is replaced before the weave is touched. Worth it wherever the sling chokes a shackle.
• Heavy eye — a reinforced, larger eye for a large bow shackle or a crane hook at high tonnage.

Polyester against the other fibres

Specifying one in five answers

1. Load per leg, not total load — and whether the figure is already derated for the hitch.
2. Hitch and angle: عمودي, choked, basket, or multi-leg, and at what included angle.
3. ڊگھائي: the effective working length, eye to eye, not the cut length of web.
4. Eye size and fitting: the shackle bow or hook it has to sit in.
5. Environment: surface, گرمي پد, chemicals, and whether it will be stored wet or in sunlight.

Questions about polyester webbing slings

Figures are for the standard build to EN 1492-1 تي 6:1; ASME B30.9 builds at 5:1 are available. The labelled working load limit always governs the lift, and the mode factors above do not replace a lift plan.