Part of the Managing Composites team at JEC World 2026

This year was also a big one for us as exhibitors. We went all out like never before and showcased some truly exciting projects. It’s not every day you’re asked to collaborate on the development of a carbon fiber monocoque for a V12 hypercar pushing up to 1,850 hp and 450 km/h (280 mph) like the Zenvo Aurora. And getting to display that chassis at our JEC stand? It has been a total crowd magnet. Nobody could stay away. Want to make friends at JEC? Bring a carbon fiber monocoque. Conversation guaranteed.

The Zenvo Aurora monocoque developed in collaboration between Zenvo and Managing Composites

Another highlight we brought to JEC was one of the chassis panels made with flax fiber for the LIUX Big, a new electric urban vehicle set to be manufactured in Spain. It’s proof that when the right engineering meets composites, efficient mobility can completely transform how cars are built. A car chassis made from plant-based materials that’s as strong as steel? Yes, it is another perfect conversation starter at JEC.

A flax panel developed in collaboration between Managing Composites and LIUX for the linen monocoque of the LIUX BIG urban car

At Managing Composites, we’ve always been driven to make composites accessible to everyone. That’s why we’re so proud to support JEC as a media partner and help spread the word about the biggest event in the composites world. With that same mission in mind, we launched The Native Lab a few years ago to provide accessible training—from beginner to advanced—in composites for anyone, anywhere. More recently, we also introduced ESEN·EYE, a professional tool designed to take composites quality control to the next level.

Last year at JEC, we showcased the advantages of computer vision-based inspection and the digitalization of quality control processes for composites. This year, we took it a step further by presenting the latest ESEN·EYE development: a portable device that brings this technology anywhere, allowing it to be applied to any part without losing an ounce of micro-scale precision—built specifically with mobility in mind.

Managing Composite’s CEO, Lluc Martí, sharing the stage with Daniel Pyzak, CATIA expert from Dassault Systèmes

When we say the 2026 edition of JEC was special for us, we really mean it. On the very first day, our CEO, Lluc Martí, took the stage alongside Daniel Pyzak, a CATIA expert from Dassault Systèmes, to explain how we use the iconic software that revolutionized the industry to design some of the world’s most exclusive hypercars. We had already been invited to present this at a Dassault Systèmes Expert Session a few months earlier, and getting to share our experience again—this time with the JEC audience—was an absolute pleasure.

At Managing Composites, we’ve always worked toward making the composites industry bigger, more popular, and more successful. That’s why we sponsor students, collaborate on research projects with other companies, and stay open to working with startups, labs, universities, and any organization that brings value to the sector.

When BIOFIBIX approached us to test their material, we were genuinely impressed—so we teamed up to explore just how far these composites could go. To put the material to the test in a real-world application, we collaborated with Zenvo and built a rear wing similar to the one on the Zenvo Aurora Agil using flax fiber. We were thrilled to see this part showcased at the Alliance for European Flax-Linen & Hemp stand, highlighting the huge potential of natural fiber composites.

Our relationship with JEC has always been something special, but the 2026 edition truly exceeded all expectations. We shared laughs with old friends, reconnected with past collaborators, discovered exciting innovations and projects, and met plenty of new people who share our passion for composites. Being a media partner of the leading international composites show is something we’re incredibly proud of—and it’s amazing to see our passion resonate with more and more people every year.

We’re already counting down to the 2027 edition! 🚀

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When composites are cheaper upfront

Every project needs its own cost analysis, taking into account its specific requirements. That said, composites can sometimes be more affordable than metals when manufacturing certain parts.

In many cases, the cost of a component is driven more by design complexity and manufacturing processes than by raw material price. This is where composites can offer a clear advantage.

Why? Because composites are made differently. Their manufacturing processes allow for simpler designs in many cases, reducing the need for additional steps. For example, a carbon fiber part can end up being more cost-effective than its metal counterpart if the latter requires extra labor such as welding, machining, or other post-processing.

One of the key advantages of composites is part consolidation—the ability to integrate multiple components into a single part, reducing assembly time, fasteners, and potential points of failure.

It’s also worth noting that not all composites are created equal. Carbon fiber with epoxy resin is usually on the higher end in terms of cost, but there are many other fiber types and material combinations that offer lower costs while delivering increasingly competitive mechanical performance.

Other ways composites become cost-effective

Even when a composite part has a higher upfront cost than a metal alternative, it can still be the more cost-effective choice overall. Lightweight components, for instance, can reduce the need for additional structural reinforcements. In other cases, composites eliminate the need for corrosion protection, which can significantly increase total system costs.

Big FRP pipes. HOBAS CC BY-SA 3.0

A good example is fiber reinforced plastic (FRP) pipes. These pipes are strong and lightweight, which reduces transportation and installation costs. They are also highly resistant to corrosion and abrasion, which is why they are widely used for transporting corrosive liquids, aggressive chemicals, fluids, and gases.

FRP pipes typically use reinforcement fibers such as glass, ensuring long-lasting performance that often exceeds 50 years. They are suitable for underground applications, and their low coefficient of thermal expansion makes them a very good option when exposed to temperature fluctuations above ground.

There are also performance-related advantages. While every composite is different, they generally offer better fatigue resistance than most conventional metals. This can translate into fewer inspections, less maintenance downtime, higher availability, and a reduced need for spare parts.

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Cost-effectiveness over the full product lifecycle

In many cases, the real value of composites becomes clear over the product’s lifecycle. A common mistake is to evaluate materials based only on upfront cost, without considering operational and maintenance savings over time. This is where lifecycle analysis comes into play, as it looks beyond the initial purchase cost.

Closeup of a Boeing 787

As we highlighted in our previous article on why carbon fiber is more expensive than other materials, transportation is one of the clearest examples.

In the latest generation of commercial aircraft, such as the Boeing 787 and the Airbus A350, the primary structure is made from carbon fiber reinforced plastic (CFRP), making them lighter and more fuel-efficient. These aircraft consume approximately 20% to 25% less fuel than previous equivalent models, although this also includes improvements from new engines and other innovations.

While composites can increase manufacturing costs, in aviation they can enable components that are 20% to 50% lighter than their metal equivalents. This leads to a significant reduction in fuel consumption, as heavier aircraft require more lift, which in turn generates more drag. This is especially relevant for long-haul flights, where large amounts of fuel—and therefore weight—must be carried.

When you look at the full lifecycle, composites often prove to be highly cost-effective—not just economically, but also from a sustainability standpoint. Their lower weight reduces fuel consumption, making them more efficient to operate and lowering CO₂ emissions. In addition, their superior fatigue resistance is one of the reasons why the use of composites in aviation continues to grow.

Continuous innovation is pushing composites further

Metal manufacturing is a highly mature field, shaped by decades of widespread use. Composites, on the other hand, are relatively new in industrial terms and continue to grow rapidly.

This means a lot of ongoing innovation. Research and development in composites is intense, and new breakthroughs are happening all the time. Each innovation unlocks solutions that weren’t possible just a few years ago. New materials, new combinations, new processes—you name it. All of this is expanding the range of applications where composites are not just viable, but the most cost-effective option available.

And that list keeps growing.

The post When are composites cost-effective? 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.

And in 2026, we’re heading back!
From March 10 to 12, Paris becomes the global meeting point for composites and for us at Managing Composites, it feels like coming home. Once again, we’ll be there with our full ecosystem, including our spin‑offs The Native Lab and ESEN·EYE, each bringing their own spark to the floor.

Over the years, we’ve built a special relationship with JEC. We don’t just attend the show — we actively collaborate with the JEC team, help spread the word, and connect the community with what makes this event so unique. This year, we’re proud to be back as an official media partner of the most important composites event in the world.

JEC 2026: pushing beyond limits

“Pushing the Limits” is the official motto of JEC World 2026, and it fits us perfectly.

At Managing Composites, pushing limits isn’t a slogan — it’s how we understand engineering. Better materials, smarter processes, stronger designs, more efficient manufacturing, and more sustainable solutions. That’s what we work on every day, and JEC is the perfect place to meet others who share that mindset and turn ideas into real projects.

Part of the Managing Composites Team at JEC World 2025

Why JEC World is so important to us

• It’s a stage for the most advanced engineering work happening inside MC
• It’s a meeting point with clients, partners, suppliers, and old friends
• It’s also a reality check on where the industry is heading
• And it’s a reminder of why we fell in love with composites in the first place

A part of the Managing Composites Team in front of the 2025 edition stand at JEC World.

Being a partner of JEC World is something we’re genuinely proud of. It’s where we share what we’re building, learn from others, and make sure we stay right at the front of the pack.

Where the whole composites ecosystem comes together

For three days, Paris becomes a high‑speed convergence zone for the entire composites industry. Materials, processes, machines, engineering, software, startups, OEMs, researchers. Everyone under one roof, sharing the same purpose: what’s next.

From hands-on innovation and live demos to business meetings, startups, and conferences on circularity, design, simulation, and manufacturing, JEC is where ideas turn into real projects.

See you in Paris!

If you’re at JEC, don’t just walk past. Stop by, say hi, Challenge us! Bring your ideas. Your questions, tell us what you’re building. We’ll show you what we are.

Meetings can be scheduled. Conversations don’t need invitations.

info@managingcomposites.com or through our LinkedIn page.

See you in Paris for JEC World 2026!

The post Managing Composites at JEC World 2026: the global capital of composites appeared first on Managing Composites.

MISIONES | MIG-20221004

El proyecto COMIC ha finalizado con éxito en su cuarta y última anualidad, en la que se han fabricado y validado 3 nuevos componentes multimaterial: dos componentes para el sector de la automoción y un componente para el sector aeronáutico.

Estos nuevos componentes han permitido un ahorro de peso con respecto a los componentes convencionales de partida. En este sentido, se han obtenido valores de % de reducción de peso de entre un 32 y un 45%.

Figura 1. Demostradores COMIC TRL5

Además, los nuevos componentes ofrecen mejoras de las propiedades mecánicas en general en los 3 casos de uso.

A mayores, se han analizado el coste y la huella de carbono de los nuevos demostradores.

De una forma más específica, las principales conclusiones que se pueden extraer de esta última anualidad son:

ACT1 – Espacio de datos embrionario para cadenas de valor de fabricación multimaterial

• Se ha demostrado que la arquitectura definida es adecuada para soportar escenarios de fabricación flexible, permitiendo la explotación conjunta de datos de diferentes procesos y sentando las bases para funcionalidades avanzadas de análisis, simulación y apoyo a la toma de decisiones en fases posteriores del proyecto.
• Se ha garantizado la localización, comprensión y reutilización de datos generados por distintos Gemelos Digitales, superando la fragmentación típica de los sistemas industriales y facilitando su explotación conjunta en escenarios de operación, mantenimiento y optimización, de cara a disponer de gemelos digitales de carácter predictivo y prescriptivo, en línea con los objetivos del proyecto y los principios de Industria 4.0.
• Se han validado los componentes del sistema (FIWARE, Keyrock, Wilma, IoT Agents, OpenMetadata, protocolos OPC UA/MQTT), confirmando que funcionan de forma segura, interoperable y conforme a los requisitos definidos en los distintos casos de uso.

ACT2 – Nuevos conceptos de componentes multimaterial

• Se han validado los modelos específicos de la unión multimaterial del UC3 para ser incorporados en los modelos desarrollados con anterioridad para poder analizar el sistema completo.
• Se han validado los nuevos conceptos de diseño de los componentes multi-material TRL4, que se fabricaron y ensayaron en actividades posteriores.

ACT3 – Nuevos procesos altamente flexibles para fabricación multimaterial

• Se ha procedido a dar soporte mediante tareas de simulación a la fabricación de los componentes.
• Se han validado en entorno de laboratorio (TRL4) los procesos de fabricación establecidos con anterioridad para la obtención de los nuevos componentes en los 3 de casos de uso.

ACT4 – Estrategias digitales para una fabricación flexible y cero defectos

• Se han desarrollado los gemelos digitales de los diferentes procesos de producción, definiendo flujos de datos y tecnologías que permiten su implementación, y definiendo con mayor precisión aquellos aspectos relativos a su implementación. El sistema completo ha sido testeado como testbed funcional, demostrando la circulación de datos desde dispositivos físicos reales hasta aplicaciones consumidoras como cuadros de mando, módulos analíticos y servicios de Gemelo Digital.
• Se han desarrollado moldes de fabricación de partes de los componentes de los 3 casos de uso. Los moldes incluyen sensórica embebida que ha permitido captar información relevante de los procesos a fin de minimizar los tiempos de optimización de los mismos.
• Se han desarrollado y aplicado con éxito técnicas de control de calidad NDT, tanto superficiales como volumétricas en los 3 casos de uso.
• Se ha aplicado con éxito la IA en alguno de los procesos de control de calidad (UC1).
• Se ha diseñado, implementado y validado con éxito en entorno de laboratorio una red de sensorización inalámbrica industrial Plug&Play, orientada a la digitalización rápida y no intrusiva de líneas de producción, demostrando su capacidad para digitalizar líneas de producción reales de forma flexible, escalable y de bajo coste.

ACT5 – Validación de la fabricación flexible y reconfigurable de nuevos componentes multimaterial – TRL5

• Se han validado los demostradores en un entorno TRL5, comprobándose su buen comportamiento mecánico, tanto estático como dinámico.
• Se ha analizado el impacto de la fabricación de los nuevos demostradores, analizándose el peso en los mismos, las emisiones de CO2 asociadas a su fabricación y su coste.

El consorcio COMIC está formado por las siguientes entidades:

DGH ROBOTICA AUTOMATIZACION Y MANTENIMIENTO INDUSTRIAL, SA – DGH es una empresa de referencia en el sector de automoción dentro del área de automatización avanzada, con sede principal en Valladolid y con otros centros de trabajo en Madrid, Vigo y Barcelona, en los que dispone de talleres perfectamente equipados para el desarrollo, fabricación y testeo de prototipos y líneas piloto para actividades de I+D. AUTOTECH ENGINEERING, SL – AUTOTECH, con sede en Amorebieta-Etxano, es el centro global de I+D para componentes de chasis del grupo GESTAMP, y se centra en el diseño y desarrollo de productos de chasis y tecnologías de ensamblado y conformado. Dispone de prensas de conformado y utillajes específicos para la fabricación de componentes híbridos metal-composite, que pondrá a disposición del proyecto. SOFITEC AERO, SL – Con sede en Sevilla, SOFITEC desarrolla soluciones integrales de fabricación de aeroestructuras, montaje y reparación en materiales compuestos y metálicos para la industria aeroespacial, en la que es un reconocido y consolidado TIER1. Dispone de instalaciones para la producción y montaje tanto de componentes metálicos como de composites, que pondrá a disposición del proyecto. FAGOR ARRASATE SCOOP – Con sede en Arrasate, FAGOR es un fabricante reconocido internacionalmente de sistemas de estampación y prensas, máquinas de corte para bobinas, y líneas y máquinas de procesado de componentes metálicos. Pondrá a disposición del proyecto 2 prensas para el conformado de productos de automoción. Dispone de su propio centro de I+D+i (KONIKER). INDUSTRIA ESPECIALIZADA EN AERONÁUTICA S.A. – Con base en Sevilla, INESPASA es una empresa más de 30 años de experiencia en el desarrollo de soluciones integrales para proyectos de Aeroestructuras: Diseño y Fabricación de Utillajes, Fabricación de Elementales Mecanizadas y Ensamblaje de Subconjuntos. NUNSYS, SA – Con sede en Paterna, NUNSYS es una empresa del sector TIC establecida como un socio estratégico, desde el punto de vista de la transformación digital, para los principales fabricantes de tecnología en múltiples sectores. Su departamento de Software estará muy involucrado en COMIC, asignando un importante número de analistas y programadores con conocimientos en las distintas tecnologías necesarias para el desarrollo del proyecto. ENDITY – Con sede en Elgoibar, ENDITY nació como una spin-off del CT IDEKO y es un reconocido actor en el desarrollo de soluciones END autónomas, tanto integrables como independientes, para aplicaciones en diferentes sectores industriales. Dispone de bancos de pruebas específicos, cabezales de inspección y escáneres END a medida que pondrá a disposición de los desarrollos del proyecto.

MANAGING COMPOSITES, SL – Con sede en Madrid, MANAGING COMPOSITES es una empresa de ingeniería centrada en el desarrollo de los diseños y todo tipo de simulaciones necesarias para apoyar dicho diseño y obtener un producto final acorde a los requerimientos planteados en diferentes sectores. Cuenta con varias estaciones de trabajo y licencias CAD/CAE de propósito general y específicas para procesos de conformado en prensa de composites, así como acceso y uso de un pequeño taller para el montaje, caracterización y validación de prototipos, que pondrá a disposición del proyecto.

Además, también participan como entidades subcontratadas varios centros tecnológicos de reconocido prestigio como: IDEKO, ITI, KONIKER, TEKNIKER y AIMEN.

Este proyecto ha sido subvencionado por el CDTI, y ha sido apoyado por el Ministerio de Ciencia e Innovación.

The post Comic. MISIONES | MIG-20221004 appeared first on Managing Composites.

Composite manufacturing methods range from highly manual processes to fully automated

Steps for Manufacturing in Composites

In any composite manufacturing process (fiber + resin), there are four essential steps, not always in this particular order which may be reduced to three depending on the type of material used.

• Impregnation: The resin, in liquid state, comes into contact with the fiber reinforcement and impregnates it. When using prepreg materials, this step is not required, as the fibers are already pre-impregnated.
• Lay-up: Placement of the fiber reinforcement onto the mold that defines the shape of the final part. Multiple layers can be stacked over the entire part or locally in specific areas to increase thickness and mechanical strength.
• Consolidation: Compaction of the different layers and removal of voids to prevent structural weaknesses in the final component.
• Curing: Activation of the chemical polymerization process, during which the resin transitions from a liquid to a solid state.

Once these fundamental steps are understood, the different manufacturing techniques used to produce composite parts can be examined.

Open Molding Processes

Wet Lay-Up (Hand Lay-Up)

A release agent or gel is first applied to the mold to prevent the part from sticking. Reinforcement mats or fabrics are then cut to size and placed on the mold surface, after which the resin is poured and spread evenly.

The simplest composite manufacturing method, accessible to virtually anyone, where fibers are manually impregnated with resin using basic tools.

Layers of reinforcement and resin are built up sequentially, using rollers to remove trapped air and excess resin. After curing at room temperature or under elevated temperature, the composite part is removed from the mold and prepared for further finishing operations.

Pros:

• Low tooling and equipment cost
• High process flexibility
• Suitable for large or custom parts

Cons:

• Strong dependence on operator skill
• Limited control over fiber-to-resin ratio
• Lower repeatability and longer cycle times

Spray-Up

Spray-up is a widely used technique for glass fiber parts that accelerates traditional wet lay-up by spraying chopped reinforcement fibers and liquid resin directly onto the mold surface. Layers are built up rapidly until the desired thickness is reached, and the process is often combined with gel coat application.

The process uses a spray gun equipped with a fiber chopper that cuts continuous glass fiber rovings into short lengths, typically between 25 and 75 mm, which are mixed with resin during spraying. This results in randomly oriented fibers that must be compacted by rolling, similar to hand lay-up.

Pros:

• Faster than traditional hand lay-up
• Widely used and effective for fiberglass parts
• Simple, well-understood process with easy operator training

Cons:

• Random fiber orientation limits mechanical performance
• High resin content and lower laminate quality compared to closed-mold processes
• Lower surface finish and dimensional control

Prepeg

Prepreg materials consist of fiber reinforcements that are pre-impregnated with a precisely controlled amount of resin during manufacturing. The resin is typically partially cured (B-stage), allowing the material to remain tacky and easy to handle until final curing.

Because impregnation is already completed, the manufacturing process focuses on lay-up, consolidation, and curing. Traditionally, prepregs are cured under heat and pressure in an autoclave, which enables excellent consolidation and very high laminate quality. However, in recent years, Out of Autoclave (OoA) prepregs have been developed to reduce processing cost and complexity.

Pre-impregnated fibers (prepregs) are a very common choice for high-performance applications.

Prepregs offer outstanding control over fiber-to-resin ratio and laminate consistency, making them a preferred choice for high-performance applications where repeatability, structural integrity, and surface quality are critical.

Pros:

• High laminate quality and repeatability
• Superior mechanical performance
• Excellent control of fiber-to-resin ratio

Cons:

• Higher material cost compared to dry fabrics
• Requires controlled storage and handling (typically refrigerated)
• Autoclave equipment often required, depending on prepreg type

Vacuum Infusion

This process, also known as Resin Infusion, is an open-mold method widely used in boat building and wind energy applications, as it enables the manufacture of very large parts with relatively precise fiber-to-resin ratios.

All reinforcement fabrics are first cut, positioned, and laid into the mold in a dry state, then sealed under a vacuum bag. Resin inlet lines are arranged and connected prior to sealing, creating a controlled resin delivery network. Once vacuum is applied, the pressure differential draws liquid resin through the inlet lines and distributes it across the dry reinforcement. Resin flow is guided by flow-assisting elements such as mesh layers, channels, or grooved core materials to ensure uniform impregnation.

Pros:

• Suitable for large, complex parts (e.g., boat hulls, wind turbine blades)
• Good surface finish on the mold side
• Lower resin content and higher fiber volume fraction than other open-mold methods

Cons:

• More complex setup and planning than basic open-mold processes
• Requires careful control of materials, flow media, and resin viscosity
• Less suitable for very high-volume production compared to automated closed-mold methods

Resin infusion is often used to manufacture very large composite parts, such as boat hulls, where controlled resin flow and material consolidation are critical.

Closed Mold Processes

Resin Transfer Molding (RTM)

In RTM, mixed resin and catalyst are injected into a closed mold containing a dry fiber preform. This process produces components with good surface finish on both sides and allows precise control over fiber architecture, orientation, and laminate thickness, as defined by the mold cavity.

Schematic of a Resin Transfer Molding (RTM) process.

RTM supports a wide range of resin systems—including polyester, vinyl ester, epoxy, phenolic, and MMA—as well as reinforcements such as glass, carbon, aramid, or hybrid fibers. The process can be automated to increase production rates while reducing scrap, making it a common choice for industrial applications.

Pros:

• Good surface finish on both sides
• Tight dimensional tolerances and uniform thickness
• Ability to mold complex structural and hollow parts

Cons:

• Higher tooling cost than open-mold processes
• More complex process control
• Not ideal for very low or very high production volumes

Resin Transfer Molding Variants

HPRTM (High Pressure RTM) is a variant of the RTM process in which resin is injected at high pressure, enabling the production of parts with high structural quality, excellent repeatability, and very short production cycles.

LRTM (Light RTM) is another variant that uses very low resin injection pressures, significantly reducing tooling cost and complexity.

Compression Molding

Compression molding is a manufacturing process used with materials such as sheet molding compound (SMC), bulk molding compound (BMC), and thick molding compound (TMC). It employs heated metal molds installed in hydraulic presses and can be highly automated. The process offers significant design flexibility, allowing features such as inserts, ribs, and bosses, while achieving good surface finishes that reduce secondary finishing operations and labor costs.

During production, a measured charge of material is placed into a heated mold, which is then closed and compressed until curing is complete, typically within one to five minutes. The finished part is then removed. Tooling consists of durable heated metal molds, usually made of steel, which are highly durable but also relatively expensive.

Pros:

• Short cycle times and high productivity
• Low labor cost
• Good dimensional control

Cons:

• High tooling cost
• Limited design flexibility after tooling
• Part size and thickness limitations

Prepreg Compresion Molding

Prepreg Compression Molding (PCM) combines the material quality of prepregs with the productivity of compression molding. In this process, stacks of prepreg material are placed into a heated matched-metal mold, which is then closed under pressure to consolidate and cure the laminate in a single step.

The use of closed molds enables good surface finish on both sides, tight dimensional control, and short cycle times, making PCM well suited for medium- to high-volume production. Compared to autoclave-cured prepregs, PCM significantly reduces processing time while maintaining a high level of structural performance.

PCM is widely used in automotive and industrial applications where repeatability, productivity, and mechanical properties must be balanced with cost.

Pros:

• Short cycle times
• Good surface finish and dimensional accuracy
• Suitable for medium- to high-volume production

Cons:

• High tooling cost
• Limited flexibility once tooling is defined

Automated & Continous Systems

Pultrusion

Pultrusion is a continuous manufacturing process used to produce composite parts with a constant cross-section, such as beams, profiles, and structural elements.

In this process, continuous fibers are pulled through a resin bath or resin injection chamber to impregnate them, then guided through a heated die that defines the final shape and cures the resin. Once cured, the profile is continuously pulled and cut to length.

Pultrusion delivers excellent fiber alignment and high fiber volume content, resulting in strong, lightweight components produced with high efficiency and minimal material waste. It is commonly used for structural profiles in construction, infrastructure, and industrial applications.

Pros:

• Continuous, highly efficient production
• Excellent fiber alignment and mechanical performance
• Low labor cost and minimal waste 

Cons:

• Limited to constant cross-section parts
• High initial tooling cost
• Low geometric flexibility

Filament Winding

In this method, continuous fibers (such as glass, carbon, or aramid), impregnated with resin, are wound under tension onto a rotating mandrel in a controlled geometric pattern. Fiber orientation is selected based on load requirements, enabling the production of strong, lightweight hollow structures such as pipes, tanks, and pressure vessels.

Once the required thickness is achieved, the laminate is cured on the mandrel using heat, and the finished part is either removed or left with a permanent liner. The process is highly automated, offering excellent precision, repeatability, and high fiber volume content, making it ideal for structural and pressure-related applications.

Pros:

• Excellent mechanical performance for cylindrical and axisymmetric parts
• Highly automated and repeatable
• Efficient material usage compared to alternative processes

Cons:

• Limited geometric flexibility
• Mandrel removal can be complex
• Surface finish often requires secondary operations

Automated Fiber Placement (AFP)

Automated Fiber Placement (AFP) is used to produce lightweight, high-strength structures, particularly for aerospace and high-performance industrial applications. It uses pre-impregnated fiber tows, typically carbon/epoxy, which are automatically placed onto complex molds or mandrels with high accuracy.

The use of robotic tools enables high precision and repeatability.

During the process, multiple narrow tows are heated, compacted, and laid down by a robotic head in predefined orientations such as 0°, ±45°, and 90°, building the laminate layer by layer. AFP offers high precision, excellent material efficiency, and the ability to manufacture complex geometries, making it suitable for structural components where performance and repeatability are critical.

Pros:

• High precision and repeatability
• High level of automation
• Ability to manufacture complex geometries

Cons:

• Very high equipment cost
• High programming and setup complexity
• Expensive raw materials

Composites manufacturing methods comparison

TL;DR

Composite parts are made by combining fibers and resin through different manufacturing processes, all of which follow the same basic steps: impregnation, lay-up, consolidation, and curing (with impregnation omitted for prepregs). Each process offers a different balance between cost, complexity, quality, automation, and production volume.

• Open-mold processes (Wet Lay-Up, Spray-Up, Vacuum Infusion) are low-cost and flexible but have lower repeatability and quality control.
• Closed-mold processes (RTM, LRTM, HPRTM, Compression Molding) provide better surface finish, dimensional accuracy, and structural performance at higher tooling cost.
• Automated processes (Filament Winding, AFP) deliver the highest performance and repeatability but require significant investment and are best suited for specific geometries or high-performance applications.

There is no single “best” process—the optimal choice depends on part geometry, mechanical requirements, production volume, cost targets, and level of automation required.

The post Manufacturing Methods in Composites 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.

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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.

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