Polyester Webbing Slings: How to Choose and Safely Use Flat Lifting Slings

Safe lifting and moving of loads is unthinkable without quality slings. Polyester webbing slings, also known as flat lifting slings, are one of the most common and practical choices in industry, construction, transport and workshops. They are lightweight, soft and easy to handle, yet capable of lifting loads from half a tonne to ten tonnes. In this guide we explain what slings are for, how to choose the right working load limit and length, what the European standard and safety factor mean, and how to use and store slings safely.

What is a polyester webbing sling and what is it for?

A polyester webbing sling is a textile sling made of 100% polyester (PES), usually in the form of woven webbing with loops (eyes) at the ends. It is used to safely lift, move and handle loads with a crane, hoist or forklift. Unlike chains and steel wire ropes, the soft webbing adapts to the shape of the load and does not damage sensitive or painted surfaces, which makes it ideal for a wide range of applications.

The main advantages of polyester webbing slings are:

• High capacity with low weight – easy handling, positioning and transport.
• Load protection – the soft webbing protects sensitive and painted surfaces from damage.
• Durability – polyester is resistant to moisture and most chemicals, with a working temperature from -40 °C to +100 °C.
• Flexibility – the sling adapts to the shape of the load and allows lifting at an angle or in a choke configuration.

EN standard and the 7:1 safety factor

The reliability of a sling rests on the standard to which it is made. The polyester webbing slings in our range are manufactured according to the European standard EN 1492-1, which sets the requirements for textile slings made of woven webbing. The standard ensures the sling is tested and marked in the prescribed way and carries a declared working load limit.

A key concept is the 7:1 safety factor. This means the actual breaking strength of the webbing is seven times greater than the declared working load limit (WLL). This reserve covers dynamic loads, wear and unforeseen working conditions, but it is never a reason to overload – the working load limit always remains the boundary up to which a sling may be used.

It is also important to know that the actual capacity depends on the method of use. The same sling has a different permissible capacity in a straight lift, a choke lift or a lift at an angle, so always choose a sling with a capacity reserve for the intended method of work.

Colour code by capacity – quick identification

One of the most practical features of webbing slings is the standardised colour code by working load limit. The colour of the webbing lets you instantly recognise the sling's capacity on site without reading the label. According to the standard code, the colours are:

• 1 t – violet
• 2 t – green
• 3 t – yellow
• 4 t – grey
• 5 t – red
• 6 t – blue
• 8 t – dark blue
• 10 t – orange

Although the colour makes quick identification easier, the official capacity information is always stated on the sling's label. Before each use, check the label and make sure it matches the load you are lifting.

How to choose the right sling?

Choosing the right sling depends on several factors. When buying, pay attention to the following:

• Working load limit (WLL): choose a capacity greater than the weight of the load, taking into account the lifting method (straight, choke, at an angle). The range includes slings from 0.5 t to 10 t.
• Working length: the length affects the suspension method and the lifting angle. Lengths from 1 to 14 m are available, so it is easy to select the right size for the lifting height and load geometry.
• Webbing width: wider webbing generally accompanies higher capacity (for example 25–30 mm for lighter slings, up to 300 mm for the highest-capacity ones) and distributes the load more evenly.
• Method of use: consider whether you will lift the load straight, in a choke or at an angle, as this directly affects the required capacity.

You can browse the full range with filters by capacity, length and width in the category polyester webbing slings.

Safe use of polyester webbing slings

Webbing slings are lifting equipment, so their correct use directly affects the safety of people and loads. The basic guidelines for safe work are:

• Inspection before each use. Check the webbing for cuts, severed fibres, burns, chemical damage or damaged seams and loops. Remove any damaged sling from use immediately.
• Do not overload. Never exceed the declared working load limit and account for the reduction in capacity when lifting at an angle.
• Protect the webbing from sharp edges. On sharp edges use protective sleeves or corner protectors to prevent cutting the webbing.
• Avoid twisting and knots. The sling must be laid flat, without knots that significantly reduce its capacity.
• Mind temperature and chemicals. The working temperature of polyester is from -40 °C to +100 °C; avoid exposure to concentrated acids and alkalis beyond the declared limits.
• Proper storage. Store slings in a dry, ventilated place, protected from direct sunlight (UV radiation) and heat sources.

If you are not sure whether a sling suits your method of work, consult a qualified person and always follow the manufacturer's instructions and applicable occupational safety regulations.

Frequently asked questions about polyester webbing slings

What does a 7:1 safety factor mean?

It means the breaking strength of the webbing is seven times greater than the declared working load limit (WLL). This reserve covers dynamic loads and wear, but it is not a reason to overload – the working load limit remains the limit of use.

How do I identify a sling's capacity by colour?

According to the standard colour code: 1 t violet, 2 t green, 3 t yellow, 4 t grey, 5 t red, 6 t blue, 8 t dark blue and 10 t orange. The exact figure is always stated on the sling's label as well.

Can a sling be used on sharp edges?

Only with protection. On sharp edges you must use protective sleeves or corner protectors, because a sharp edge can cut the webbing and drastically reduce its capacity.

Does the capacity change depending on the lifting method?

Yes. The same sling has a different permissible capacity in a straight lift, a choke lift and a lift at an angle. That is why you should always choose a sling with a capacity reserve for the intended method of work.

How should polyester webbing slings be stored?

In a dry, ventilated place, protected from direct sunlight and heat sources. Before each use, inspect the webbing, seams and loops and set aside any damaged sling.

Polyester webbing slings combine simplicity, safety and versatility – with the right choice of capacity and length and adherence to basic rules of use, they will reliably serve you in everyday lifting. When choosing a sling, start from the weight and shape of the load, the lifting method and the working conditions, and then select a model with an appropriate capacity reserve.