Material choice starts with the limits of the lift: temperature, edges, headroom, rigging weight and chemicals. Compare strength and price only among the materials that pass those limits.
1. Four materials at a glance
| Selection factor | Steel wire rope | Polyester (PES) | Nylon (PA) | HMPE / UHMWPE |
|---|---|---|---|---|
| Typical density | 7.85 g/cm³ | 1.38 g/cm³ | 1.14 g/cm³ | 0.97 g/cm³ |
| Typical elongation at working load | Low; construction-specific | About 3% for webbing; round slings vary | About 8–10% | About 0.5–1% |
| Sling temperature range | Construction-dependent; check rope core and termination | −40 to +100 °C (EN 1492) | −40 to +100 °C (EN 1492) | −40 to +70 °C (ISO 18264 Annex B) |
| Behavior in water | Needs corrosion protection | Wet strength is largely unchanged | Check wet-strength data with the manufacturer | Hydrophobic; floats |
| Chemical tendency | Depends on coating and lubrication | Resists most mineral acids; damaged by alkalis | Resists alkalis; attacked by mineral acids | Good resistance to seawater and many industrial chemicals; check the specific chemical |
| Outdoor behavior | Corrodes without protection | Good outdoors; inspect the cover | Check the manufacturer's UV data | Good, with the cover intact |
| Main advantage | Heat and abrasion tolerance; high absolute capacity | Stable, economical, general-purpose lifting | Cushioning when the load moves or settles | High strength-to-weight ratio and corrosion resistance |
| Main limitation | Weight, corrosion and inspection burden | Alkalis and sustained heat | Stretch, acids and water and UV exposure | Heat, sustained-load creep and sharp edges |
These are typical material and manufacturer ranges, not acceptance criteria. The finished sling's label, test documentation and the project's lift plan govern the actual lift.
2. Steel wire rope: for heat, abrasive surfaces and high capacity
Steel wire rope remains the practical choice when the load is hot, the surface is abrasive, or absolute capacity matters more than rigging weight. It tolerates abrasion that would quickly damage an unprotected textile sling, and it does not creep like HMPE under sustained load. It still needs protection at sharp edges.
The permissible temperature depends on the rope core and the termination, not only on the steel: fiber cores, aluminum ferrules and steel-core constructions have different limits. Check the manufacturer's temperature table and the applicable EN 13414-1 construction rather than assuming steel is heatproof.
The trade-offs are weight, corrosion maintenance and inspection. Broken wires inside the rope are hard to see, and broken wire ends can injure hands. Steel is the right choice for hot or abrasive duties, but it is not a default for every heavy lift.
3. Polyester: the stable general-purpose choice
Polyester is the usual choice for routine industrial lifting. Its elongation at working load is about 3% for webbing; round slings can differ, so use the manufacturer's value. That keeps movement small as tension develops, which suits controlled positioning, limited headroom and fixed final heights.
It handles outdoor exposure well: wet strength is largely unchanged, and EN 1492-1 Annex D notes that polyester resists most mineral acids but is damaged by alkalis. EN 1492 allows use and storage from −40 °C to +100 °C. Keep polyester away from alkalis and from sustained heat above that range.
For product and standard details, see polyester webbing slings, EN 1492-1 explained and EN 1492-2 explained.
4. Nylon: use the stretch, and allow for it
Nylon stretches about 8–10% at working load. When a load settles onto the sling, or a lift is made from a moving vessel, that elasticity can reduce the peak load passed to the crane and the load.
Elasticity does not make shock or snatch loading acceptable. A 2 m nylon leg lengthens by about 160–200 mm at working load, against about 60–80 mm for polyester. If hook height or final placement is fixed, that difference matters.
EN 1492-1 Annex D notes that polyamide resists alkalis but is attacked by mineral acids. For wet strength and UV exposure, ask the manufacturer for data on the specific sling. Choose nylon when movement is expected and headroom allows it, not as a substitute when polyester is unavailable.
5. HMPE: for weight and corrosion, not for heat
HMPE has a very high strength-to-weight ratio. Its density is about 0.97 g/cm³, so it floats, and its elongation at working load is about 0.5–1%. That matters when rigging weight takes up crane capacity, when crews handle the sling repeatedly, or when seawater and corrosion drive maintenance cost.
HMPE has three limits. It creeps under sustained load, so fiber grade and load history matter. It needs protection from edges and abrasion. And it is not a high-temperature material: ISO 18264:2022 Annex B gives −40 °C to +70 °C, and liftrue publishes that figure for its finished slings. JB/T 8521.1-2025 and JB/T 8521.2-2025, the Chinese industry standards, allow a wider −80 °C to +80 °C for UHMWPE. liftrue's standard published range for its finished slings remains −40 to +70 °C; a wider envelope is not a catalogue rating and is only considered through a project-specific engineering review.
EN 1492-1 and EN 1492-2 do not list HMPE as a material. HMPE slings are built with construction and test methods referenced to them.
For the application-specific comparison, see HMPE vs steel wire rope vs polyester for offshore lifting. For creep, temperature, edges and grade selection, see HMPE sling limitations.
6. Matching material to duty
| Duty or constraint | Material to evaluate first | Why | What to verify before ordering |
|---|---|---|---|
| Hot load, welding area or abrasive surface | Steel wire rope | Better heat and abrasion tolerance | Rope core, termination, manufacturer's temperature table and edge protection |
| General factory lifting with controlled placement | Polyester | Low stretch and predictable behavior | Alkali exposure, edge protection and WLL |
| Outdoor, wet or mineral-acid exposure | Polyester | Good moisture behavior; resists most mineral acids | Actual chemical exposure and cover condition |
| Load settles, a vessel moves or cushioning is useful | Nylon | Higher elongation absorbs movement | Available headroom, acid exposure and manufacturer's wet-strength and UV data |
| Heavy lift where rigging weight limits the crane | HMPE | High strength-to-weight ratio | Creep, temperature, edges and fiber grade |
| Offshore, marine or corrosive environment | HMPE or polyester | Neither is affected by seawater corrosion; HMPE also reduces handling weight | Offshore duty, abrasion and total rigging weight |
| Above +100 °C, or sustained heat | Specialist steel wire rope assembly | Textile slings stop at +100 °C (polyester) or +70 °C (HMPE); heat tolerance of a steel assembly depends on its core and termination | Rope core, termination and the manufacturer's temperature table; not every steel sling is rated above +100 °C |
| Tight budget with ordinary conditions | Polyester | Broad availability and stable general use | Do not trade away required temperature or edge performance |
7. What to send with a quote request
Send the details of the lift, not only a material name:
1. Load and geometry: weight, center of gravity, dimensions, lifting points and the number of legs.
2. Hitch and WLL: straight, choker or basket; the required WLL for the complete assembly, not a fiber strength figure.
3. Length and headroom: effective working length, hook height and acceptable movement under load. For webbing and round slings, see sling length tolerance.
4. Temperature and duration: ambient temperature, load temperature, and whether the exposure is brief or sustained.
5. Edges and surface: sharpness, abrasion, finished surfaces and the protection already planned.
6. Environment: water, salt, UV, oils, acids, alkalis or other chemicals.
7. Duty history: occasional lift, repeated handling or long-term suspension.
8. Documentation and jurisdiction: design factor, marking, test reports, traceability and the standard named in the project specification.
Material alone does not define WLL. The finished construction, stitching or winding, eyes, end fittings, cover, design factor and test evidence all contribute.
Purchase price is only one line in the comparison. Rigging weight changes crane time and manual handling; corrosion protection and inspection add to the operating cost of steel; a higher purchase price for HMPE has to be weighed against those costs for the specific duty. For repeat lifts, include storage, inspection and replacement intervals as well. Compare the delivered, installed and inspected cost, not the price per sling alone.
FAQ
Is HMPE always better than polyester?
No. HMPE is attractive when weight, corrosion resistance or handling dominates the decision. Polyester is often more practical for general lifting and tighter budgets, and where its higher temperature limit and lower creep matter more than minimum rigging weight.
Should I choose nylon or polyester for a low-headroom lift?
Usually polyester. Nylon's typical 8–10% elongation at working load uses up height and changes the final position of the load. Polyester's roughly 3% is easier to accommodate when placement is constrained.
Can different materials be mixed in one multi-leg sling assembly?
Only with engineering review. Legs with different elongation do not necessarily share the load equally as tension develops. The lift plan should account for stiffness, angles, length tolerance and the rating of the complete assembly.
Why do suppliers publish different temperature ranges for HMPE?
They may be describing different things: fiber-level properties, a particular product grade, or the conservative service range of a finished sling. Test duration and strength-retention criteria also differ. Check whether a figure belongs to the fiber or to the complete sling.
What should decide the material first: price, weight or standard?
Check temperature, edges, movement, environment and WLL first. Then apply the project's standard and documentation requirements, and compare weight and price among the materials that pass.
Further reading
- HMPE Slings
- UHMWPE vs HMPE: A Buyer's Guide
- HMPE vs Steel Wire Rope vs Polyester for Offshore Lifting
- EN 1492-1 Explained
Send us the load, the hitch, the environment and the temperature and we will propose the material and the sling. Standard sizes ship in 3–7 days; custom-engineered slings take 2–4 weeks. Use the inquiry form and we will come back with a configuration and a price.
Basis and disclaimer: values are typical material and manufacturer ranges. Standard references are to EN 1492-1:2000+A1:2008, EN 1492-2:2000+A1:2008 and ISO 18264:2022. Always work from the current edition of each standard and the manufacturer's instructions for use. This article is buyer education; actual acceptance follows the purchase order and the lifting plan issued for your project.
References
[1] EN 1492-1:2000+A1:2008, Textile slings — Safety — Part 1: Flat woven webbing slings made of man-made fibres for general purpose use (Annex D).
[2] EN 1492-2:2000+A1:2008, Textile slings — Safety — Part 2: Roundslings made of man-made fibres for general purpose use.
[3] ISO 18264:2022, Textile slings — Lifting slings for general purpose lifting operations made from fibre ropes — High modulus polyethylene (HMPE), Annex B.
[4] EN 13414-1, Steel wire rope slings — Safety — Part 1: Slings for general lifting service.
[5] Mazzella Companies, Polyester and Nylon Synthetic Web Slings: Features and Characteristics, for typical nylon and polyester elongation.
[6] Certex Norge, What is Dyneema®?, for typical HMPE properties and long-exposure temperature guidance.
[7] Unitex (Scanunit), Web Slings and Round Slings (product catalog PDF), for typical HMPE elongation and density.
[8] JB/T 8521.1-2025 and JB/T 8521.2-2025, Chinese industry standards, cited for the UHMWPE temperature range in section 5.