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Polyester Webbing Sling.
Last updated 28 October 2026 · reviewed against EN 1492-1
The default sling for anything finished, painted or machined: 一个 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.
In one line: a polyester webbing sling is a flat woven PES band with an eye at each end (or an endless loop), 额定 1 到 100 t working load limit at a 6:1 safety factor to EN 1492-1, elongating ≤ 3 % at that load, and colour coded so the capacity is readable from across the yard.
它是什么, 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.
| Web width | WLL | 最小. break | 典型用途 |
|---|---|---|---|
| 25 毫米 | 1.0 t | 6 t | Tooling, 小部件 |
| 35 毫米 | 1.5 t | 9 t | Workshop general purpose |
| 50 毫米 | 2.0 t | 12 t | The most ordered size |
| 75 毫米 | 3.0 t | 18 t | Fabrications, 机器零件 |
| 100 毫米 | 4.0 t | 24 t | Painted steel, 面板 |
| 125 毫米 | 5.0 t | 30 t | 管道, bundled sections |
| 150 毫米 | 6.0 t | 36 t | Precast units |
| 200 毫米 | 8.0 t | 48 t | Heavy fabrications |
| 240 毫米 | 10.0 t | 60 t | Modules, 打滑 |
| 300 毫米 | 12.0 t | 72 t | Top of the single-ply range |
| 多于 12 t | Multi-ply builds of 300–400 mm web — see the 60 吨 和 100 tonne slings | ||
Nominal values for the standard build. The label on the article is the governing figure, and every sling is proof loaded against its serial before dispatch.
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.
| Hitch | Factor | 一个 5 t sling gives |
|---|---|---|
| 垂直的, single leg | 1.0 | 5.0 t |
| 窒息 | 0.8 | 4.0 t |
| 篮子, 0–45° | 2.0 | 10.0 t |
| 篮子, 45–60° | 1.4 | 7.0 t |
| Two legs, 0–45° | 1.4 | 7.0 t per assembly |
| Two legs, 45–60° | 1.0 | 5.0 t per assembly |
| Four legs, 0–45° | 2.1 | 10.5 t per assembly |
The colour is the capacity
在 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. 多于 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.
| 颜色 | WLL | 颜色 | WLL |
|---|---|---|---|
| 紫色 | 1 t | 红色的 | 5 t |
| 绿色的 | 2 t | 棕色的 | 6 t |
| 黄色的 | 3 t | 蓝色的 | 8 t |
| 灰色的 | 4 t | 橙子 | 10 t |
ASME B30.9 does not use colour coding; the tag states the WLL and the hitch. Never infer capacity from colour on a sling built to B30.9.
Eye types and builds
- 眼睛和眼睛 — 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.
- 无尽 — a closed loop with no stitching at the load path, used where the sling must be passed around the load. 看 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
| 纤维 | WLL 伸长率 | 选择它时 | Avoid when |
|---|---|---|---|
| 聚酯纤维 (聚醚醚酮) | ≤ 3 % | The pick must stay level and the load must not be marked. The default. | 冲击载荷, or alkalis at strength. |
| 尼龙 (PA) | 8–10 % | The band has to absorb a snatch or a swell. | Height-critical lifts; it stretches and recovers. |
| 超高分子量聚乙烯 | Lower still | Mass is the problem — the same rating at a fraction of the weight. | 热, or a load left hanging: it creeps. |
| 芳纶 | 低的 | Castings, welded fabrications, furnace areas. | Cost-driven orders; abrasion without a sleeve. |
Specifying one in five answers
- Load per leg, not total load — and whether the figure is already derated for the hitch.
- Hitch and angle: 垂直的, 窒息, basket, or multi-leg, and at what included angle.
- 长度: the effective working length, eye to eye, not the cut length of web.
- Eye size and fitting: the shackle bow or hook it has to sit in.
- 环境: surface, 温度, 化学品, and whether it will be stored wet or in sunlight.
Questions about polyester webbing slings
What is a polyester webbing sling?
A flat woven band of polyester yarn, with an eye at each end or woven into an endless loop, rated for lifting. It is the standard sling wherever the load is finished, painted or must not be marked by wire rope.
What safety factor does it have?
6:1 两个一 1492-1 和 5:1 to ASME B30.9. 一个 2 t sling therefore has a minimum breaking load of 12 t, and the label states which basis it was built to.
How much does it stretch?
No more than 3 % 在工作负荷极限, and it recovers when the load comes off. 尼龙, by comparison, runs 8–10 %, which is why polyester is preferred for precision picks and paired lifts.
What do the colours mean?
In EN 1492-1 the band colour states the WLL: violet 1 t, 绿色的 2 t, 黄色的 3 t, 灰色的 4 t, 红色的 5 t, 棕色的 6 t, 蓝色的 8 t, 橙子 10 t. 多于 10 t there is no assigned colour and the label carries the figure.
Polyester or nylon?
Polyester for a controlled pick: 3 % against 8–10 % elongation, and better resistance to UV and to weak acids. Nylon is the answer where the band must absorb shock, or where alkalis are present.
Can it be used choked?
是的, 在 0.8 of the vertical rating — a 5 t sling chokes 4 t. The choke point wears fastest, so a sleeve there is worth fitting rather than replacing the sling.
When is it retired?
On a cut or snag through the weave, broken or drawn stitching, a distorted or worn eye, glazing from heat, chemical damage, or an unreadable label. Any one of those retires the sling; none of them is repairable.
Related: all webbing slings · eye & eye flat web sling · endless web slings · endless lifting slings · WLL 60 ton webbing slings · 100 tonne webbing sling · 圆形吊带 · 钢丝绳吊索 · one way slings · 货物起重网
Tell us the load and the hitch
Send the load per leg, the hitch and the length eye to eye, and we will come back with width, ply count, eye size and the labelled WLL — on a drawing, before anything is woven.
起重吊索索具公司, Ltd · Lifting & rigging division of China Lifute Sling Group
电话 / WeChat +86 180 6600 2268 · 702461526@qq.com
利夫特工业园, 台州市, Jiangsu Province, China · HS code 630790
Figures are for the standard build to EN 1492-1 在 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.