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In this article, we discuss the similarities and differences between Carbon Fibre and Kevlar, how they are made and the benefits and downsides of each.
Carbon Fibre is long thin strands mostly made from carbon atoms which are bonded together in microscopic crystals.
The crystal is aligned which makes them incredibly strong. They are then twisted together, very similar to the cotton-producing process, into yarn. The yarn is then woven together to create Carbon Fibre Cloth. There are different types of weave for carbon fibres:
TWILL
Diagonal pattern from an over-over and under-under It is the most recognisable carbon fibre pattern and offers a looser form than a plain design, making it better for more complex shapes.
PLAIN
Also known as bidirectional standard over/under very easy to handle, because of a tight weave.
SATIN
Satin has a brick like resemblance which comes from a number over-overs (typical four or eight) to one under. The pattern is not the easiest to work with and is best suited to complex curves.
UNIDIRECTIONAL
As the name suggests, all the yarn is one directional. There is no weave, and it is often held together with a thread, though this does not alter the structure of the carbon fibre. It is most suited to moulds that have a force acting only on one axis
Carbon fibre is well known for its low weight and high strength, making it the ideal advanced composite material in the Marine, Automobile and Aerospace industries. Key benefits include:
Despite having a wide range of advantages, carbon fibre is still a relatively new composite material which does come with some disadvantages:
There are two steps to making Kevlar.
Carbon is best suited for areas that require a higher stiffness and strength. While carbon fibre offers the best strength and rigidity to weight in the industry; it is also generally the most expensive of reinforcements.
Carbon fibre is also much more straightforward to cut, sand and machine in comparison to Kevlar, which requires specially made drill bits once laminated.
That said, Kevlar offers a better abrasive strength than carbon fibre, which is why it commonly associated with bulletproof vests. Kevlar is also better in extreme temperatures than carbon fibre, which some indicate make it better suited in the marine industry.
For more information on Tricel Composites reinforcement materials, or to speak to one of our technical team about the best-advanced composite for you, visit our contact us page.
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