Left: Carbon fibre crankset with 53/39 rings. Right: Aluminium crankset with 53/39 rings. Photo credit: John Rees

Before getting into the comparison, it’s important to clarify that we’ll be using generalizations. There are many different types of aluminium and many types of carbon fiber, each with their own properties. Unless stated otherwise, when we talk about carbon fiber, we mean a composite made of carbon fibers and epoxy resin, and for aluminium, something like 6061 or similar. We’ll focus on the most representative properties of each material to keep the comparison as fair as possible.

Comparison between carbon fiber and aluminium

In the table below, we compare some of the most relevant properties of each material to give a clearer picture of their differences.

When is carbon fiber clearly superior to aluminium?

As mentioned earlier, it depends on the specific project. But if we simplify, we can say that when strength-to-weight ratio or stiffness-to-weight ratio are critical, carbon fiber is usually the better option.

On top of that, carbon fiber is anisotropic, which makes it especially effective in applications where the main loads are directional. Another key advantage of composites is their resistance to corrosion, while aluminium can experience galvanic corrosion depending on the environment and the materials it’s in contact with.

When is aluminium clearly superior to carbon fiber?

Again, simplifying things, aluminium is the better choice when heat dissipation matters, since it has very high thermal conductivity. It’s also generally easier to scale for large-volume industrial production.

Aluminium boat hull. Photo credit: NearEMPTiness

Aluminium behaves in a very predictable way under impact—it bends or dents instead of suddenly breaking, which is a big advantage in certain products. And while it depends on the application, it’s usually more affordable, which can be a deciding factor in many projects.

Where do they compete?

There are plenty of industries where both materials are solid options, but here are three common examples. They show pretty clearly that materials are just one part of the equation in engineering—choosing the right one depends on a lot of specific factors.

Aviation

Metals have traditionally been the go-to materials for aircraft manufacturing, especially aluminium. However, composites are becoming more popular thanks to the efficiency gains they offer and advantages like improved fatigue resistance in certain cases.

Carbon fiber light aircraft fuselage. Photo credit: Matti Blume

Bicycles

Carbon fiber bikes have been around for years and dominate the high-performance segment, but aluminium is still very popular among many riders. Generally speaking, carbon bikes are lighter, while aluminium ones tend to handle crashes and rough use better.

Wheels

Most bikes, motorcycles, and cars use aluminium alloy wheels, although high-performance models increasingly use carbon fiber wheels or offer them as an option. Aluminium wheels offer a great balance of strength, cost, and weight, while carbon fiber wheels deliver top performance with the lowest possible weight.

When should hybrid carbon fiber and aluminium parts be used?

A growing engineering approach is to use hybrid structures combining carbon fiber and aluminium to take advantage of both materials. For example, using carbon fiber outer layers attached to aluminium frameworks, or aluminium structures reinforced with CFRP, or directly joining a carbon fiber structure to an aluminium one. This allows engineers to benefit from lightweight stiffness along with the ductility and energy absorption of metal.

Alfa Romeo 4 C combination of carbon fiber and aluminium. Photo credit: youkeys

However, these combinations need careful design, since it’s usually necessary to avoid direct contact between the two materials to prevent galvanic corrosion in aluminium. Another important factor is thermal expansion—aluminium expands much more with temperature than carbon fiber, so the design has to accommodate that difference.

TL:DR

Aluminium is more ductile, isotropic, usually more affordable, and better suited for large-scale production. Carbon fiber is stiffer, lighter, anisotropic, and enables designs that aren’t possible with metal.

Depending on the project, one will be a better fit than the other. In some cases, the best solution is actually a hybrid design that combines both materials.

The post Carbon Fiber vs Aluminium appeared first on Managing Composites.

So what are we really comparing? Carbon fiber vs aramid fibers. And that’s where the classic question shows up.

Hybrid fabric with carbon and aramid fibers

Which one is better? Carbon fiber or aramid?

The honest answer: neither, unless you know what you want it for. But there’s a general rule of thumb:

• Aramid fibers (like Kevlar®) excel in impact resistance, toughness, and abrasion resistance.
• Carbon fiber dominates in stiffness, strength-to-weight ratio, and compressive performance.

The real difference isn’t raw strength, it’s how each material behaves when things go wrong. Let’s see how they compare.

Carbon fiber typically stretches only about 1.5% before failure, while Aramids can elongate up to 4%, allowing them to absorb energy instead of cracking.

Carbon Fiber: The King of Stiffness

Carbon fiber is made from highly aligned crystalline carbon filaments as we explained in an article about What is exactly Carbon Fiber. This structure gives it extraordinary rigidity and one defining characteristic. There are multiple types of carbon fiber and this varies depending on the exact specification, but as a general rule we can say that carbon fiber really doesn’t like to bend.

Its stiffness (Young’s modulus up to hundreds of GPa) allows engineers to create ultra-light structures that remain dimensionally stable under heavy loads.

Why engineers love carbon fiber

• Exceptional strength-to-weight ratio
• Extremely high stiffness
• High compressive strength
• Excellent thermal performance
• Strong UV resistance compared to other fibers

Carbon fiber pattern

That’s exactly why carbon fiber shows up everywhere in high-performance engineering. These applications are some of the most carbon fiber intensive:

• Aircraft structures
• Formula 1 chassis
• High-performance cars
• Drone frames
• High-end bicycles
• Structural panels and robotic arms

When rigidity and precision are needed, carbon fiber wins.

Kevlar®: The King of Toughness

Kevlar was engineered with a completely different philosophy: survive impacts instead of resisting deformation. Its molecular structure allows to absorb more energy, wich makes it shine when experiencing impacts.

What makes Kevlar® and aramids so special?

• Exceptional impact resistance
• Outstanding abrasion resistance
• High toughness and energy absorption
• Slightly lower density than carbon fiber
• Strong resistance to many chemicals and fuels

That’s why aramids are so popular for ballistic protection and impact-heavy environments.

Aramid fabric

The trade-offs of Kevlar®

Kevlar struggles where carbon fiber excels:

• Poor compressive strength (fibers can buckle)
• Lower stiffness
• Sensitive to UV exposure without protection
• Difficult machining and cutting due to high abrasion resistance

Why Carbon Fiber and Kevlar Behave So Differently

The difference comes down to energy management.

Carbon fiber:

• High modulus
• Minimal elongation
• Stores elastic energy
• Tends to fail more suddenly than Kevlar

Kevlar:

• Lower modulus
• Higher elongation
• Dissipates impact energy
• Tends to fail more progressively than carbon fiber

One resists movement. The other absorbs it. Kevlar ® also shows better abrasion resistance, while carbon fiber maintains superior dimensional stability under load.

Carbon fiber plays a key role in hypercar performance and is widely used in many other high-performance sectors.

Carbon Fiber vs Kevlar: Quick Comparison

When to choose carbon fiber over Kevlar®?

Carbon fiber is the correct choice when a rigid lightweight structure is needed. For example, Drone arms, aerospace panels, structural components, etc.

When is aramid better than carbon fiber?

As a general rule, in case impact or abrasion resistance are desirable, aramids tend to provide a better solution than carbon fiber, like for kayak skid plates, protective gear, armor layers, etc.

Hybrid Carbon/Kevlar composites: The best of both materials.

Although some precautions must be taken when using them, hybrid laminates combining both fibers are very common because they take advantage of the strengths of each material.

• Kevlar® inner layers to absorb impacts and prevent catastrophic failure
• Carbon fiber outer layers to provide stiffness and UV protection
• Hybrid fabrics with aramid and carbon fibers

This hybrid approach balances rigidity and survivability, improving it’s overall performance.

TL;DR

Carbon fiber and Kevlar® aren’t better or worse than each other — they’re designed for different jobs.

• Carbon fiber shines when stiffness, dimensional stability, and high strength-to-weight ratio are required.
• Kevlar® (aramid fibers) excels in impact resistance, toughness, and abrasion resistance. It absorbs energy instead of cracking, but lacks stiffness and compressive strength.

Engineering is always more nuanced, but as a quick rule of thumb for rigidity and precision, carbon fiber wins. For impact protection and durability, Kevlar is normally better. Sometimes it is worth combining both using hybrid carbon/Kevlar® composites.

In composites engineering, the real question isn’t which material is stronger — it’s how you want the structure to behave.

The post Carbon Fiber vs Kevlar®: Which One Is Better? appeared first on Managing Composites.

It isn’t a simple “good or bad” debate. Today, composites are often the most sustainable option available — and if we push their sustainability even further, they’ll become the best choice in many more applications, reducing environmental impact across multiple industries. So let’s break down where composites already shine… and where there’s still work to do.

Why are composites so good for sustainability?

Composites boost sustainability because they deliver huge lifetime efficiency gains. By making vehicles, aircraft, and turbine blades lighter, they reduce energy consumption and emissions or boost efficiency from the very first day of use.

Composites play a key role in modern wind energy. They enable longer blades and higher energy output, increasing efficiency while delivering massive lifetime emissions savings.

A well-known study from the University of Tokyo illustrates this perfectly: when comparing a conventional steel passenger car with a CFRP-lightweighted version, the CFRP car achieved about a 36% weight reduction, translating into roughly a 15% decrease in total life-cycle energy consumption. Even with the higher embodied energy of CFRP, the use-phase savings more than compensated for it.

Composites also last longer than metals in many applications — no corrosion, far less fatigue — meaning fewer replacements and less waste. And they offer engineers enormous design freedom: fibers can be placed only where strength is needed, reducing weight and material use even further, something impossible with isotropic materials like steel or aluminum. In short, composites help industries run cleaner, lighter, and longer.

How can composites be more sustainable?

There are countless initiatives aimed at improving the sustainability of composites. Universities, manufacturers, public institutions, and end users all recognize the advantages composites offer—and how much further their adoption could grow if they became even more sustainable.

At Managing Composites, we’ve shared several of the projects we’ve participated in, each perfectly illustrating the many angles from which composite sustainability is being addressed. In the COMIC project, for example, we worked alongside other companies to innovate in the manufacturing process, while in the MC4 project the focus shifted toward enabling true circularity.

Let’s take a look at some of the approaches currently being explored to enhance the sustainability of composite materials.

Material innovations

Natural Fiber Composites (NFC)

Natural Fiber Composites (NFCs) have become one of the most promising pathways for improving the sustainability of composite materials. By replacing synthetic fibers such as carbon or glass with bio-based alternatives like flax, hemp, jute, bamboo, manufacturers can significantly reduce the environmental footprint of a component from the very beginning of its life cycle.

Natural fibers require less energy to produce, rely on renewable agricultural sources, and often come with the added benefit of carbon sequestration during plant growth. Compared with traditional fibers, they offer lower CO₂ emissions, reduced reliance on fossil resources, and improved end-of-life options — including biodegradability in some configurations.

Flax-fiber monocoque for the LIUX BIG showing how natural fibers can deliver lightweight, strong, and more sustainable composite structures for the automotive industry.

While NFCs cannot yet match the mechanical performance of high-grade carbon fiber, they continue to get closer thanks to ongoing research and development. At Managing Composites, for example, we supported LIUX in the design and manufacturing of the monocoque using flax fiber — a material that delivers excellent performance for the vast majority of production vehicles.

Bio Resins

Bio-resins are another key pillar of composite sustainability, offering a way to reduce the environmental impact of the matrix itself — the part of the composite traditionally most dependent on petrochemicals. These resins are partially or fully derived from renewable sources such as plant oils, lignin, sugars, or other biomass, lowering reliance on fossil feedstocks and reducing overall CO₂ emissions during production.

Performance-wise, bio-resins have advanced dramatically. While early generations struggled to match the mechanical and thermal properties of conventional epoxies or polyesters, today’s bio-based systems are increasingly competitive — especially in automotive, mobility, sports equipment, marine components, and consumer products, where peak aerospace-grade performance isn’t required.

Recyclable Resins

One of the biggest breakthroughs in composite sustainability is the development of recyclable resin systems. Traditional thermoset resins form irreversible chemical bonds during curing, which makes them extremely durable—but very difficult to recycle.

Through innovations such as dynamic covalent chemistry (vitrimer resins), these next-generation systems can be reheated, reprocessed, and even chemically broken down to recover both fibers and resin. Instead of ending up in landfills, components made with these resins can be dismantled, reshaped, repaired, or fully recycled, extending their useful life and drastically reducing waste.

That is exactly what we did in the MC4 project — breaking down the kayak we had built to reprocess the material and create new paddles.

Final review of the MC4 project with the European Commission at the Waste Lab Bizkaia.

Recycled Content

Recycled fibers come from different sources — cured scrap, dry fiber offcuts, or end-of-life components — and can be processed into chopped, milled, or even continuous forms depending on the recycling method. While mechanical recycling typically shortens the fibers, the resulting materials still offer excellent stiffness and strength for many applications in automotive, mobility, construction, sports equipment, and consumer goods.

The environmental benefits are substantial: recycled carbon fiber can reduce CO₂ emissions by up to 90% compared with virgin fiber production, and recycled glass fiber dramatically reduces landfill waste, which remains a major issue in large-scale industries like wind energy.

One of the key challenges in composite recycling: effectively separating fibers from the resin matrix so they can be recovered, reused, and reintroduced into new high-performance applications.

End-of-Life Solutions

EoL (End-of-Life) innovation plays a key role in improving composites sustainability, which is why numerous research projects are underway to find effective ways to manage composite parts once they reach the end of their service life.

Design for Disassembly

The most forward-thinking approach is designing composites so they can be more easily taken apart at the end of their life. This includes using reversible chemistries (such as vitrimers or recyclable resins), reducing co-curing between subcomponents, incorporating fasteners instead of bonds where possible, and creating modular architectures. If a part is designed with its “goodbye” in mind, recycling becomes far more feasible and economically attractive.

Mechanical Recycling

This is the most established approach: the composite is cut, shredded, or ground into smaller fragments, which are then used as reinforcement in new materials. Although the fibers lose length (and therefore mechanical performance), the recycled material is perfectly suitable for applications in construction materials, automotive parts, panels, and other non-structural components. Its main value is simple: it prevents landfill waste and gives composites a second life.

Chemical Recycling

Chemical recycling goes deeper by breaking down the resin matrix to recover clean fibers — carbon or glass — with far less damage compared to mechanical methods. Technologies such as solvolysis, supercritical fluids, and catalytic depolymerization allow the recovery of high-quality fibers that can re-enter the supply chain. While still energy-intensive and not yet fully scaled, chemical recycling holds enormous promise for achieving true circularity, especially in carbon fiber.

TL;DR

Composites are already strong sustainability enablers thanks to lightweighting, long service life, and efficient performance across automotive, aerospace, and wind energy. A 36% weight reduction in CFRP cars, for example, can deliver ~15% lower life-cycle energy use.

But there’s still room to improve. Real progress comes from four fronts:
• Material innovation — natural fibers, bio-resins, recyclable resins, and recycled fiber content.
• Smarter manufacturing — processes and chemistries that reduce energy use and increase circularity.
• End-of-life solutions — design for disassembly, mechanical recycling, and chemical recycling.

The post Sustainability in Composites appeared first on Managing Composites.

Computer Vision Assisted Quality Control tools automatically generate Fiber-orientation maps, showing real ply angles across the carbon-fiber laminate and highlighting deviations that could affect structural performance and visual quality.

Inspections Before Manufacturing

Quality starts way before anyone touches a mold. Fibers and resins go through chemical and mechanical checks to make sure every batch behaves the way it should. Prepregs get their own VIP treatment: areal weight, resin distribution, tack, and general condition are inspected to confirm they’ll process smoothly and won’t surprise anyone halfway through a layup.

Only after materials pass documentation reviews and supplier audits — full traceability, stable processes, no mysteries — are they allowed anywhere near production. This is how you avoid building defects into the part before the part even exists.

Inspections During Manufacturing

Once manufacturing kicks off, the mission is simple: every ply exactly where it’s supposed to be, every process parameter exactly as specified. Cure temperatures, ramp rates, pressure, dwell times — composites don’t forgive improvisation.

Fiber orientation, ply sequence, handling… everything gets monitored to avoid wrinkles, gaps, overlaps, and other uninvited guests. Vacuum integrity and consolidation are checked constantly to keep porosity and trapped air out of the picture. Real-time inspection is your best friend here — catch issues early, long before they become laminate-level drama.

Computer-vision tools automatically detect upward or downward trends in key variables—often long before they go out of tolerance—allowing corrective adjustments to be applied in time.

This is where automated computer vision really shines. Deviations humans would never catch? Detected instantly. That’s why at Managing Composites we built ESEN·EYE: it spots early-stage deviations, and keeps your process comfortably inside tolerance instead of flirting with disaster.

Inspections After Manufacturing

After demolding, the inspection game isn’t over — it just gets more forensic. Among other Non Destructive Tests (NDT) available, Computer-vision systems like ESEN·EYE capture high-resolution details to spot wrinkles, dry areas, pinholes, FOD or any cosmetic defects that think they can hide.

This image shows the result of an automatic diameter analysis on a machined hole in a carbon-fiber component. The system overlays precise inner and outer diameter measurements, detects deviations from nominal values, and highlights tolerance issues instantly.

Fiber alignment and orientation (the silent heroes of performance and aesthetics) get checked with precision. Inserts, machining features, geometry, symmetry — all the usual suspects — are validated against the exact spec of your production line. And because computer vision doesn’t get tired, moody, or biased, every measurement stays fully objective.

Other Benefits of Computer-Vision-Assisted Quality Control

Scanning 100% of every part means nothing slips through. Automatic quality reports give you a crystal-clear snapshot of each component, plus full traceability and a historical production archive — ideal for audits, troubleshooting, or proving to someone that yes, the part was perfect when it left your shop.

Collecting statistical data from every part and every production run allows manufacturers to keep a full record of each component, build statistical databases, and apply data-analysis tools to continuously improve the manufacturing process

TL;DR

Quality control in composites matters because you’re literally manufacturing the material as you build the part.

Before production: fibers, resins, and prepregs should be checked, so no defect sneaks in disguised as a “raw material issue.”

During production: monitor layup, fiber orientation, vacuum, and cure — with systems like ESEN·EYE catching early-stage deviations your eyes will never see.

After production: high-resolution computer vision verifies surface quality, fiber alignment, geometry, inserts… everything — delivering reliable specs and full traceability.

The post How to Enhance Quality Control in Composites appeared first on Managing Composites.

That’s why we created The Native Lab, a platform dedicated to composites learning, accessible to anyone with a computer, where we share knowledge about our passion: composites.

Top Composites Courses

Managing Composites is an engineering company specialized in high-level developments in sectors such as aerospace, marine, and automotive. In particular, the hypercar and motorsport sectors are where the company has earned the strongest reputation, thanks to the large number of projects in which results have exceeded expectations. You’ve probably seen our work… You just didn’t know it was us.

We design some of the most cutting-edge composite solutions in the world for the most demanding industries, relying on engineers who come from some of the most advanced companies on the planet: Airbus, Mercedes AMG F1 Team, Koenigsegg… All courses at The Native Lab are designed and delivered by our engineers, drawing directly from experience in the world’s most prestigious companies.

For example, our Composite Materials Program is taught by Eneko Angulo (formerly McLaren and Koenigsegg) and Sergio de Juan (formerly Airbus). The Monocoque Design Program is led by Lluc Martí (formerly Koenigsegg), Alejandro Batán (formerly Prodrive and McLaren), and Marc Oliva (formerly Koenigsegg and McLaren). These are just a few examples of the instructors behind The Native Lab’s programs—professionals whose expertise gives our certifications strong recognition within the industry.

Composites hands-on bootcamps. The real deal

Growing demand for practical training led us to launch a series of bootcamps designed to provide hands-on experience working with composites, learning the tips and tricks gained from years of industry experience. We currently offer bootcamps for three manufacturing technologies.

The Prepreg Bootcamp is offered at Level 1 and Level 2, with the latter intended for those who have completed the first course. We also offer an intensive alternative consisting of five consecutive days of pure hands-on immersion in the manufacturing of carbon-fiber prepreg parts.

The second manufacturing method for which we offer bootcamps to gain hands-on experience is the most traditional one: Wet Layup. This 100% practical training covers all the key aspects needed to implement this method successfully.

The third technique is taught in the Resin Infusion Bootcamp, where participants practice resin impregnation under vacuum—from designing infusion layouts to applying releasing agents correctly to ensure a successful manufacturing process.

This fully practical training is the perfect opportunity to learn directly from our instructors—professionals with hands-on composite lamination experience in top-tier environments such as Formula 1 teams and aerospace factories—who share the techniques that ensure success and efficiency when manufacturing high-performance carbon-fiber parts. And it’s not just for industry: our bootcamps can also be tailored AdHoc for Formula Student teams, Moto Student teams, and companies looking to have their people trained by the best.

Composite Talks

In addition to the courses described above and the other training resources available on The Native Lab, the platform offers free access to Composite Talks. These include a series of interviews, webinars, and presentations featuring high-interest topics and leading voices in the composite materials sector..

From the challenges faced in developing Natural Fiber Composites to the aerodynamic design of vehicles, this section brings together some of the industry’s most notable professionals to share their insights with us. The Native Lab is a highly specialized training platform that remains committed to its founding mission: providing anyone in the world with access to high-quality content related to composite materials. No barriers, no drama, just the good stuff.

The post Expert composites courses… but cooler appeared first on Managing Composites.

There are several ways to categorize the different carbon fiber fabrics that exist.

In this article, we’ll explore the different types of carbon fiber and the properties that set them apart. When we refer to carbon fiber, we often mean a carbon-fiber composite—fiber combined with resin and cured. However, covering every possible composite configuration would make this article far too long, so we will focus exclusively on the types of raw carbon fiber, without considering resin systems.

Classification by Precursor Material

One of the most common ways to categorize carbon fibers is by the precursor from which they are produced. Today, two main precursor families dominate the industry.

Polyacrylonitrile (PAN)

PAN is the dominant precursor, accounting for roughly 90% of commercial carbon fibers. It is valued for its high carbon yield and excellent mechanical performance, which have made it the industry standard. PAN can be used as a homopolymer or a copolymer, often with additives that enhance processing and improve final fiber properties.

Pitch

Pitch-based carbon fibers are produced from petroleum- or coal-derived asphalt. They are mainly used when extremely high performance is required, as this precursor allows the production of fibers with very high modulus and exceptional thermal stability. While less common than PAN-based fibers, pitch-derived fibers excel in applications demanding the highest stiffness levels.

Rayon

Rayon was the first precursor used to produce carbon fibers in the 1950s and 1960s. It originates from a cellulosic source, typically dissolving pulp. Although it has largely been replaced due to its lower carbon yield and higher cost, it remains historically significant as the origin of carbon-fiber technology.

It’s not only about aesthetics, every type of carbon fiber fabric has specific mechanical characteristics. Credit: Christine Twigg

Classification by Mechanical Properties

The two primary mechanical properties used to distinguish one carbon fiber from another are tensile strength and tensile modulus. Tensile strength is the maximum force a material can withstand while being pulled or stretched before breaking or becoming permanently deformed.Tensile modulus measures a material’s stiffness—its resistance to stretching or deforming under tension.

These metrics are essential for achieving the desired mechanical performance and can vary widely between fiber types. A common classification system groups fibers according to their elastic modulus, resulting in five categories.

Low Elastic Modulus

• Tensile modulus ≤ 200 GPa
• Tensile strength ≤ 3500 MPa

Standard Elastic Modulus

• Tensile modulus: 200–275 GPa
• Tensile strength: 2500–5000 MPa

Intermediate Elastic Modulus

• Tensile modulus: 275–350 GPa
• Tensile strength: 3500–8000 MPa

High Elastic Modulus

• Tensile modulus: 350–600 GPa
• Tensile strength: 2500–5000 MPa

Ultra-High Elastic Modulus

• Tensile modulus: 600–950 GPa
• Tensile strength: 2500–4000 MPa

Classification by Form

Another essential factor when choosing a carbon fiber is its form, since this determines how it can be used. Because carbon fiber is anisotropic, the orientation of its filaments greatly influences the material’s mechanical behavior.

Unidirectional Tape

An arrangement of continuous fibers aligned in the same direction. This provides extremely high tensile strength along that orientation and allows engineers to tailor mechanical performance based on fiber direction and the number of layers used.

Fabric Forms

Carbon-fiber fabrics are created by interlacing fibers, just like any textile. Different weave patterns result in different properties. These are the three most common types:

Plain Weave

Plain weave interlaces fibers in an alternating over-under sequence, forming a simple checkerboard-like pattern. It offers balanced strength in multiple directions, excellent dimensional stability, and easy handling—ideal for flat or gently curved surfaces. However, it is not the best option for highly complex geometries.

Twill Weave

Twill weave typically appears in 2×2 or 4×4 patterns. In a 2×2 twill, each tow passes over two and under two; a 4×4 follows the same principle with four. This produces the fabric’s characteristic diagonal pattern. Twill is more pliable and drapes better over complex shapes while maintaining good stability, though it requires more careful handling to avoid distortion.

Satin Weave

Satin weaves provide excellent drapability and easily conform to complex contours, though they are less stable than plain or twill weaves. Common variants include 4HS, 5HS, and 8HS, where the tow passes over several tows and under one (3/1, 4/1, and 7/1 respectively). Higher harness numbers improve drape but reduce stability.

Chopped Fiber

With the increasing popularity of forged carbon fiber, another available format is chopped fibers or short strands. This material adapts easily to complex molds, though forged carbon exhibits mechanical behaviors different from traditional continuous-fiber composites. If you want to learn more about the strengths and applications of forged carbon fiber, we recommend this article where we analyze its unique advantages.

Forged carbon fiber partial cover for a Lamborghini engine bay.

Classification by Tow Size

Carbon-fiber filaments are extremely small—typically 5–9 microns in diameter. Before weaving, they are grouped into bundles called tows. A common way to describe fabric weight or thickness is by specifying the number of filaments per tow.

A 3K fabric is made with tows of 3,000 filaments per tow. A 6K fabric is composed by tows with 6,000 filaments per tow, and a 12K fabric contains tows made by 12,000 filaments each. Tow size directly influences fabric appearance, weight, and handling characteristics.

TL;DR

Carbon fibers come in many types, defined mainly by their precursor (PAN, pitch, or rayon), their mechanical performance (from low to ultra-high modulus), their form (unidirectional tape or woven fabrics like plain, twill, and satin), and their tow size (3K, 6K, 12K, etc.). PAN is the standard precursor, pitch is used for the highest-stiffness fibers, and rayon is historically significant. Fabric weave and tow size determine drape, stability, and final part behavior, while chopped fiber enables forged-carbon applications.

The post Carbon Fiber Types appeared first on Managing Composites.

The use of steel and carbon fiber offers endless possibilities for engineers.

Tensile strength refers to a material’s ability to resist pulling loads without breaking. However, this can be a tricky question to answer, since these two materials are fundamentally different. Their mechanical behavior depends on many factors, and a direct, absolute comparison is not entirely fair. Let’s take a closer look at their characteristics.

Comparison Between Steel and Carbon Fiber

*These are average, representative values for each type of material, as there are special grades of steel and carbon fiber composites that can differ widely.

Summary:
Per unit of weight, carbon fiber composites are far stiffer and stronger than steel. Even the standard carbon fiber grade shows an order of magnitude higher breaking length, which means it can sustain far more load relative to its weight before failing.

Why Is It So Hard to Define Which Material Is Stronger?

First, both belong to very broad families of materials. Steel properties vary considerably depending on the type — whether it’s carbon steel, stainless steel, or high-strength alloy steel.

The same applies to carbon fiber: there are numerous types of fibers and resins, and every combination results in a composite with unique mechanical properties.

Carbon fiber and its composites are anisotropic, meaning they have very high strength along the direction of the fibers but much lower strength transversely. This is especially relevant for unidirectional composites, where the load direction determines the performance. That’s why many woven carbon fabrics include layers oriented at 0° and 90° to balance mechanical behavior and improve overall performance.

So… Is Carbon Fiber Stronger Than Steel?

The short answer: yes — because carbon fiber generally has a much higher specific strength and absolute tensile strength than steel.
But when you analyze it more deeply, there are many variables that influence the outcome, and a simple direct comparison is not truly representative.

When Is It Better to Use Carbon Fiber, and When Is Steel the Right Choice?

As we’ve seen, these materials are so different that one cannot be said to be universally “better” than the other without considering the application.

• Carbon fiber is the better choice when weight reduction is a key factor, thanks to its unmatched strength-to-weight ratio.
• Another reason why steel is often the more convenient choice is its behavior in the event of catastrophic failure, which is more favorable than that of composites for many applications.
• Steel tends to perform better when components must endure compressive loads or high-impact conditions.

Each material comes with its own advantages and drawbacks, so the right choice depends on the application and the specific requirements for each part.

How to Compare Carbon Fiber with Steel in Real Life

Metals and composites are so different that they should not be seen as substitutes for one another. At Managing Composites, we believe that focusing solely on mechanical test data only shows part of the picture. The true potential of these materials lies in the specific design and the intended function of the part. Composites enable designs that metals simply cannot achieve. Therefore, they should not be understood as a replacement, but rather as a distinct material category — one with its own design logic, advantages, and engineering possibilities.

TL;DR

• Carbon fiber outperforms steel in strength-to-weight and stiffness-to-weight ratios.
• Steel remains superior in toughness, ductility, catastrophic failure behavior and thermal stability.
• A direct comparison between carbon fiber and steel is very complex, since these are two very different families of materials, each with variants that have widely diverse characteristics.
• Choosing between them depends entirely on the design, load case, and purpose of the part.

The post Is Carbon Fiber Stronger Than Steel? appeared first on Managing Composites.

Carbon fiber composites offer an unbeatable strength-to-weight ratio, making them the ideal material for high-performance components.

Carbon Fiber Production

As we explained in this article, carbon fiber is produced from organic polymers known as precursors, most commonly polyacrylonitrile (PAN). About 90% of all carbon fiber is made from PAN, while the remaining 10% comes from rayon or petroleum pitch.

Carbon fiber production involves energy-intensive stages and specialized materials.

As shown in the diagram, creating carbon fiber filaments is a complex process that involves polymerizing the precursor, fiber spinning, thermal stabilization, carbonization (and sometimes also graphitization), surface treatment, washing, drying, sizing, and winding. Some of these steps are energy-intensive, and others require costly materials, which gradually drives up the price of carbon fiber.

Limited Use

Carbon fiber is becoming increasingly popular, and more and more products are being made from carbon fiber composites. However, compared to metals, it still represents a niche material, which means it cannot yet benefit from the same economies of scale as its metallic counterparts. Even so, the use of carbon fiber continues to grow every year, so its rising adoption is expected to help bring costs down over time.

One of the sectors that makes intensive use of carbon fiber is aviation, although it produces very specialized products: few units per year and very large parts, making it a highly unique process that is difficult to replicate elsewhere.

The BMW i3 sold more than 200.000 units, developing a true massive industrial production process with carbon fiber

The BMW i3 is one of the best examples of the mass use of carbon fiber. This model, manufactured in Leipzig, was the first mass-produced car to feature a monocoque chassis made from this material. Its production ended in 2022 after nine years and more than 200,000 units manufactured, developing a true mass production industrial process with composite materials.

Craft-Based Manufacturing

Although there are industrial manufacturing processes for high-volume carbon fiber parts, most production remains low-volume and requires highly manual, craft-based techniques. These processes depend on skilled technicians —who are in high demand— since the quality of the final product relies heavily on their expertise.

They also require many hours of labor, as it’s not cost-effective to automate small-scale production. As a result, the labor costs of these products are much higher than those of mass-produced items.

Specialized Equipment

Manufacturing carbon fiber composite parts often requires specific equipment. Autoclaves for curing, storage rooms for prepregs, and other tools and facilities depending on each project can significantly increase overall costs. In contrast, metal manufacturing typically benefits from equipment that is already widely available and often fully or partially amortized.

High-Performance Designs

Carbon fiber is used in some of the most exclusive machines in the world, whose components require hundreds or even thousands of hours of design work. For instance, when a Formula 1 part made of carbon fiber is said to cost a certain amount, the material itself accounts for only a small fraction —most of the cost comes from the engineering hours invested in its development.

Some applications of carbon fiber require the most exclusive variants to achieve the highest possible performance, regardless of cost.

This also applies to many high-end sports equipment components, accessories, and similar products. The top-of-the-line models —which usually feature carbon fiber— have the highest prices, but their cost is not just about the material; it also reflects their extensive R&D investment.

When Carbon Fiber is Cost-Effective

Although carbon fiber parts are generally expensive, there are cases where they can actually become the most economical option. Because components can be built differently than with other materials, carbon fiber enables designs that would be impossible —or much more complex— in metal. In some cases, a part that would require extensive welding and processing in metal can be manufactured in one step with carbon fiber, ultimately making it the more affordable option.

When Carbon Fiber is the Most Profitable Investment

Sometimes, even when carbon fiber isn’t the cheapest option upfront, it turns out to be the most cost-effective in the long run. This is often the case in vehicles, where using carbon fiber helps reduce overall weight —and therefore energy consumption. This improved efficiency means that the initial investment in carbon fiber pays off quickly, making it the most profitable choice.

TL;DR

Carbon fiber isn’t pricey just because it’s high-tech —it’s because making it is hard work. It starts with costly precursors (mostly PAN) and goes through several energy-intensive steps before becoming usable.

Add to that:

• Small-scale, craft-based manufacturing that demands skilled technicians.
• Specialized equipment like autoclaves and cold-storage rooms.
• High R&D investment, especially in top-performance applications like Formula 1 or aerospace.

Although carbon fiber is usually expensive, it can still be the most cost-effective option —either because it lowers operational costs or, in some cases, because it’s actually cheaper to produce.

The post Why is carbon fiber so expensive? appeared first on Managing Composites.

Hypercars and supercars really shine on the racetrack.

What really sets a hypercar apart from a supercar?

As you might guess, hypercars sit above supercars. They’re more exclusive, rarer, and built for more extreme use. It’s a clear hierarchy: hypercar owners usually already have (or have had) one or more supercars, while supercar owners often dream of one day owning a hypercar.

McLaren W1 Hypercar. Author: MrWalkr

Performance: Power, Top Speed, and Acceleration

Supercars are already high-performance machines, but hypercars push things even higher — faster, more powerful, and sharper in every sense. While “performance” can mean many things (top speed isn’t everything), hypercars consistently outperform supercars in raw numbers.

Power

Today, most supercars produce between 500 and 800 horsepower, while it’s common for hypercars to exceed 1,000 hp, especially when combining a powerful internal combustion engine with multiple electric motors.

Top Speed

Top speed is one of the easiest ways to spot the difference. Most supercars reach around 330 km/h (205 mph), while hypercars regularly go beyond 400 km/h (250 mph) — and some even aim for 450 km/h or higher. It’s the realm where aerodynamics, power, and advanced materials meet their limits.

Acceleration

The typical supercar goes from 0 to 100 km/h (0–62 mph) in about 3.5 seconds, while hypercars can do it in around 2.5 seconds or less.

Production volume

Unlike regular cars, supercars and hypercars aren’t made in huge numbers — but the gap between them is still massive. Supercars are typically produced in the low thousands, while hypercars rarely go beyond a few hundred units. That level of exclusivity is part of what defines them.

Ferrari LaFerrari Hypercar. Author: Yanko Malinov.

Take Ferrari, for example: around 20,000 units of the 458 Italia were built, while the LaFerrari, a clear hypercar, was limited to 500 units, plus 210 of the Aperta version. Those numbers say it all — when it comes to production, hypercars live in a completely different world.

Ferrari 458 Italia Supercar. Author: Ravas51.

Manufacturing

When you build only a few cars, you don’t need an assembly line — you need craftsmanship. Hypercars are often hand-built, with an incredible amount of manual work behind every detail. Each piece, from the carbon fiber body to the interior stitching, reflects hours of precision rather than minutes of automation.

Supercars, on the other hand, are produced in larger numbers — usually a few thousand — using semi-industrial processes that speed up production without sacrificing quality. They strike a balance between exclusivity and efficiency.

Price

Price might not define whether a car is a supercar or a hypercar — but it’s definitely the most visible difference.

Koenigsegg Jesko Hypercar. Author: Matti Blume.

Supercars usually sit in the hundreds of thousands of euros or dollars, while hypercars start around one million and climb well beyond. That’s the result of everything we’ve seen so far: rarity, craftsmanship, materials, and performance. In short, you’re not just paying for speed — you’re paying for the cutting edge of automotive engineering.

What makes a car a supercar?

A supercar goes far beyond a regular sports car. It’s built for high performance, precision handling, and style that turns heads. These cars are designed to deliver pure driving excitement, using lightweight, exclusive materials and finely tuned engines that often exceed 500 horsepower.

A modern supercar can reach around 340 km/h (211 mph) and sprint from 0 to 100 km/h (0–62 mph) in under four seconds — not bad for something you can still drive to dinner.

They come from some of the biggest names in performance: McLaren, Ferrari, Aston Martin, Lamborghini, and others — built through refined, semi-industrial processes that balance craftsmanship and production efficiency.

Prices range from $250,000 to $750,000, depending on the model, version, and spec.

What makes a car a hypercar?

The hypercar is the next level — where performance meets obsession. Here, it’s not just about building a fast car, but about pushing engineering and technology to their absolute limits.

Zenvo Aurora Hypercar.

Hypercars are extreme in every sense: they use the best materials, the most advanced technology, and the most ambitious designs that can still be legally driven on the road. They’re basically rolling showcases of what’s possible when cost is no object.

That’s why they’re measured in millions, built almost entirely by hand, and produced in very limited numbers. Many borrow technology straight from race cars — active aerodynamics, hybrid high-performance powertrains, and advanced composites everywhere.

TL;DR

The post What is the difference between Hypercars and Supercars appeared first on Managing Composites.

A second use of the term points to carbon fiber fabric — the woven or unidirectional textiles produced from bundles of carbon filaments, before being combined with resin.

Carbon fiber filaments are much thinner than a human hair—around 5 to 7 microns in diameter—yet far stronger, which explains their crucial role in high-performance composites

Finally, carbon fiber filaments may also be referred to as carbon fiber. These are extremely thin strands, typically around 5 to 7 micrometers in diameter, much finer than a human hair. They are composed of long chains of carbon atoms arranged in a highly ordered structure, giving them exceptional tensile strength and stiffness.

Filaments are usually bundled together into tows containing thousands of fibers, which then serve as the basis for producing fabrics and composites.

How is carbon fiber made?

Carbon fiber is produced from organic polymers known as precursors, most commonly polyacrylonitrile (PAN). About 90% of all carbon fibers are made through the PAN process, while the rest originate from rayon or petroleum pitch. Not all carbon fiber is identical and different qualities and grades are achieved depending on the manufacturing method and the gases, liquids, and other materials used.

Carbon fiber production begins with PAN precursor, which undergoes stretching, oxidation, carbonization, and graphitization before surface treatment, sizing, and winding into tows ready for composite manufacturing.

The production of carbon fiber involves several controlled stages:

• Spinning – the precursor is mixed with other ingredients, spun into fibers, washed, and stretched.
• Stabilizing – chemical treatment alters the fibers to make them thermally stable.
• Carbonizing – the stabilized fibers are heated at very high temperatures, forming tightly bonded carbon crystals.
• Surface treatment – oxidation of the fiber surface improves bonding with resins.
• Sizing – a protective coating is applied, and fibers are wound into tows or yarns for further use.

What resins are used for carbon fiber composites?

In the vast majority of cases, when people talk about carbon fiber composites, they are referring to carbon fiber combined with an epoxy resin. Epoxies dominate because they offer excellent mechanical strength, chemical resistance, and fatigue performance, making them the default choice for aerospace, automotive, and high-performance applications.

Epoxy resin is the most common polymer matrix for carbon fiber composites, delivering high strength, durability, and chemical resistance in aerospace, automotive, and advanced engineering.

Other resins can be used, but much less frequently.

Polyester resins are cheaper, though they provide lower performance. For this reason, they are more commonly paired with glass fiber, which is also more economical, rather than with carbon fiber.

Vinyl ester resins sit somewhere in between, offering greater toughness and chemical resistance than polyester but not quite matching epoxy, which explains why the most common combination remains carbon fiber with epoxy resin.

There are also special-purpose resins. Phenolic resins are valued for their fire resistance and low smoke emission, making them suitable for specific applications.

Another example is the resin we used at Managing Composites in the European research project MC4, focused on circularity in composite materials. For this project, we built a kayak in composite materiales which can be reshaped and reused at the end of life of the product thanks to a vitrimer resin developed by CIDETEC. This resin is a thermosetting polymer that behaves like a thermoset at service temperatures but can be healed or partially reprocessed by applying heat and pressure.

Key characteristics of carbon fiber

• High strength-to-weight ratio. Carbon fiber composites can achieve the strength of steel at a fraction of the weight.
• High stiffness. The ordered atomic structure of carbon filaments provides exceptional rigidity.
• Anisotropy. The properties of carbon fiber composites depend strongly on the orientation of the fibers, which allows engineers to tailor stiffness and strength in specific directions.
• Fatigue resistance. Properly designed carbon composites maintain their properties under repeated stress cycles better than many metals.
• Corrosion resistance. Unlike metals, carbon fiber does not rust and shows good resistance to chemical attack, although galvanic corrosion may occur in direct contact with aluminum.
• Thermal properties. Carbon fibers withstand high service temperatures depending on the specific resin matrix.

Common Applications of Carbon Fiber

Carbon fiber has steadily expanded from its origins in aerospace and defense into a wide range of industries. As manufacturing methods improve and costs gradually decrease, it continues to gain prominence in new sectors, where its strength, lightness, and durability unlock performance advantages that traditional materials cannot match. Today, it is found not only in high-tech engineering but also in products that are part of everyday life.

The Airbus A350-1000 is built with over 50% carbon fiber reinforced polymer composites, reducing weight while boosting fuel efficiency and performance.

Some of the most common applications include:

• Aerospace: Aircraft structures, helicopters, turbine parts, aircraft interiors, and space components.
• Automotive: High-performance cars, electric vehicles, body panels, motorbike parts, and structural reinforcement.
• Sporting goods: Bicycle frames, tennis rackets, surfboards, skis, and helmets.
• Marine: High-performance boat hulls, masts, and kayaks.
• Wind energy: Reinforcement of specific parts of turbines.
• Civil engineering: Strengthening and retrofitting of concrete and infrastructure.
• Medical devices: Prosthetics, surgical instruments, and imaging equipment.
• Drones, robotics, armors, etc.

Why is carbon fiber the best material for hypercars?

In 1980 McLaren built the MP4/1, the first Formula 1 car with a carbon fiber monocoque chassis. Its success transformed motorsport, with every F1 team quickly adopting the technology — a standard that remains today.

Hypercars and supercars borrowed directly from this racing heritage and beyond body panels, carbon fiber is now used in monocoques, interiors, wheels, small components, and many more parts.

From Bugatti to McLaren and Koenigsegg, today’s hypercars rely on carbon fiber composites to achieve unmatched lightness, strength, and performance.

Strength to weight ratio

The performance of a car depends less on its absolute power than on its power-to-weight ratio. Since carbon fiber enables the necessary strength to be achieved at lower weight, it makes cars lighter and their power results in higher performance.

Rigidity and safety

Carbon fiber provides extreme stiffness while also offering excellent crash protection. Composite structures offer wide design possibilities to create tailor-made architectures that dissipate energy in a precisely calculated manner, offering outstanding protection for the occupants of the vehicle.

Prestige and exclusivity

Beyond performance, carbon fiber has become a symbol of cutting-edge technology and craftsmanship. Its distinctive woven look is instantly associated with hypercars, reinforcing their status as the pinnacle of automotive engineering.

Design optimization

Carbon fiber is anisotropic, meaning its strength varies depending on the orientation of the fibers. Additional layers can be added or removed to achieve higher or lower strength, and reinforcement can be applied only in the specific areas of a part where it is required. These variables, among many others, make it possible to optimize components in ways that are unattainable with other materials.

PROS & CONS of Carbon Fiber

Q&A

• Why is carbon fiber so expensive?
  Because its production involves costly precursors and complex processing, although for certain applications it is the more cost-effective option.

• Is FRP carbon fiber?
  Not always. FRP means Fiber Reinforced Polymer; carbon fiber reinforced polymer (CFRP) is just one type.

• Is carbon fiber a thermoplastic or a thermoset?
  The fibers are neither. Most composites use thermoset resins (epoxy), but thermoplastic versions also exist.

• Is carbon fiber stronger than steel?
  Yes. It can be as strong as steel while being about five times lighter.

• Can carbon fiber be recycled?
  Traditional composites are difficult to recycle, but new resins such as vitrimers allow reprocessing.

• What is a carbon fiber monocoque?
  A one-piece chassis made of carbon fiber composite, combining stiffness, lightness, and crash protection.

• Can carbon fiber parts be repaired?
  Yes, but repairs can be complex and require specialized techniques.

• Is carbon fiber always black?
  Usually, yes — but resins or hybrid fibers can add color.

• What is better, a fiberglass or a carbon fiber paddle?
  Carbon fiber is lighter and stiffer; fiberglass is cheaper and more flexible.

• Who invented carbon fiber?
  Edison made the first fibers in 1879, but modern high-strength fibers came in the 1960s.

• What is carbon fiber prepreg?
  Carbon fabric pre-impregnated with resin, ensuring quality and consistency, cured under heat and pressure.

Carbon fiber components, like this aerodynamic detail on a supercar, combine lightness, strength, and design precision to enhance performance.

TL;DR

• Carbon fiber can mean composite, fabric, or filaments. The most common meaning is composite: carbon fiber + resin.
• Epoxy resin + carbon fiber is the most common combination. Other resins like vinyl ester, phenolic or vitrimers are for very specific uses.
• Mostly made from PAN (polyacrylonitrile) via multi-stage process.
• Key properties: strength-to-weight ratio, stiffness, anisotropy, fatigue resistance, corrosion resistance, thermal stability, design flexibility.
• Applications: aerospace, automotive, marine, wind energy, sports, medical.
• All hypercars use a carbon fiber monocoque and body panels.
• Pros: performance, design freedom, prestige. Cons: high cost, recycling challenges, complex manufacturing.

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