Kevlar with SageZander

You can see all the details about our high temperature sewing threads here.

A lot of clients ask us for Kevlar® thread coming with expectations of good cut sand abrasion resistance and high temperate resistance. They are absolutely right on these properties and we can further enhance the threads in various ways.

“Serving our customers with their needs at the heart of our operations.”

What is Kevlar and how is it made?

Kevlar is a synthetic fibre in a class called para-aramids. It is produced through a condensation reaction of an amine and an acid chloride to form long, strong, and rigid polymer chains. These chains include rings of carbon atoms called aromatic or benzene rings, whose arrangement in the polymer chain determines the para prefix in the name para-aramid.

The Kevlar fibres are then processed using various methods, resulting in filament Kevlar, conventional ring-spun Kevlar, and stretch broken Kevlar. These various methods of processing the Kevlar result in different properties in the Kevlar that is produced. You can read more about these different processes here.



  • Tensile strength
  • Ballistic resistance
  • Cut and puncture resistance
  • Heat resistance
Kevlar thread - yarn wholesale UK supplier - SageZander

Dyed Kevlar

Generally, Kevlar® thread is yellow in colour. However, we also supply black Kevlar® thread. The black colour component is melted in the actual raw material mix before extrusion, so the black thread extruded contains this colour within the fibre itself, rather than being dyed onto it later which would result in a lower colourfastness.

It is possible to dye Kevlar, but this is not an easy task. We dye red Kevlar thread and other colours. There are limitations to consider but getting small quantities of blue or red Kevlar thread is a possibility.

Our Stock

We can do a wide range of Kevlar® sewing threads in different counts. Usually, our minimum order quantity is around 80 spools, with Kevlar sewing threads in Nm 50/2, 50/3 and 50/4 being the main items. The minimums for coloured Kevlar thread are usually based on weights. Check out our steel-cored Kevlar threads which can be done in yellow and can be offered using black Kevlar thread. These are usually used for temperatures up to 700°C.

Kevlar Facts

How much do you know about Kevlar®? We’ve compiled some interesting Kevlar facts, that you may have been unaware of.

  • Kevlar was developed by Stephanie Kwolek at DuPont in 1965 and produced commercially in 1971. 
  • While Kevlar can be ignited, it stops burning once the source of ignition is removed.
  • Kevlar does not melt. It only decomposes once it reaches a temperature of 450 degrees Celsius.
  • Kevlar is unaffected by cold temperatures. It can stay stable in conditions of minus 200 degrees Celsius. 
  • Its first commercial use was as a replacement for steel in racing car tires.
  • Kevlar is 5 times stronger than steel, based on weight. 
  • Kevlar is incredibly easy to clean. Bleach is the only product not recommended to use. 
  • While most people associate Kevlar with bulletproof vests, it is used in many facets of manufacturing. Kevlar is used in; shoes, ping pong paddles, brake pads, and even your smartphone! 
These Kevlar® facts prove that there is a lot more than meets the eye, and show how versatile it can be, when looking at its use in manufacturing and production. Read on below to see some other examples of applications for Kevlar® thread. 

Examples of applications for Kevlar thread

Kevlar® has a myriad of uses as a result of its many impressive characteristics. Below is a small sample of Kevlar’s uses beyond the well-known bullet and stab resistant vests.

Tires (Bicycle and car (original use))

Kevlar® was originally invented at the DuPont company by Stephanie Kwolek while looking for a replacement for steel in car tyres to reduce fuel consumption. Today, Kevlar® in tyres reduce the weight of tyres, improving fuel efficiency, and adds abrasion resistance to reduce wear. It is also used in some bicycle tires for the same reasons and to reduce the likelihood of punctures.


Kevlar® is used in speaker drivers that audiophiles have often credited with producing a richer sound than standard drivers. Not only are speaker drivers taking advantage of Kevlar®, but also bows for violas, violins, and cellos, that are characterised by their warmth.

sowing thread or yarn - kevlar in audio speaker - yarn wholesale UK supplier - SageZander

Marine applications

Kevlar® is used in composite materials to form boat hulls, reducing the weight of the boat, thus increasing speed and fuel efficiency. Kevlar® composite materials are also much more wear resistant than traditional building materials. Kevlar® reinforced hulls range from small canoes to much larger power and sailboats.

Kevlar Properties and available grades

Kevlar Properties and available grades - Yarn Supplier - SageZander

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