Carbon fiber reinforced plastic (CFRP) is a group of composite materials that combine thin strands of carbon with a polymer binder to produce parts that are both strong and lightweight. The term is often shortened to carbon fibre or simply carbon when the context is clear. CFRP differs from conventional metals by offering a very high strength-to-weight and stiffness-to-weight ratio, and is valued where reducing mass without sacrificing performance is essential.

Composition and microstructure

At its simplest, CFRP consists of carbon fibers—long, continuous or chopped filaments made mostly of carbon atoms—embedded in a thermoset or thermoplastic matrix. Epoxy resins are the most common matrix material for high-performance parts, but polyester, vinyl ester and nylon systems are also used depending on cost and application. Fibres can be arranged as unidirectional tapes, woven fabrics, braided structures or nonwoven mats to tailor stiffness and strength in specific directions.

Key properties

  • High specific strength and stiffness: CFRP components weigh less than comparable metal parts while carrying equal or greater loads.
  • Anisotropy: Mechanical properties depend strongly on fibre orientation; designers lay fibres to meet directional loads.
  • Corrosion resistance and fatigue behavior: CFRP does not rust and often shows good fatigue life, though damage modes differ from metals.
  • Electrical and thermal characteristics: Carbon fibres are conductive, which affects electrical grounding and thermal management in parts.

Manufacturing methods

Common fabrication techniques include hand lay-up, vacuum bagging, resin transfer moulding (RTM), filament winding and automated tape laying. Pre-impregnated fibres (prepregs) cured in an autoclave produce high-quality aerospace components; lower-cost processes are used for sporting goods and consumer items. The choice of process influences part cost, repeatability and mechanical performance.

Applications and examples

CFRP is used across many sectors. Aerospace and high-performance automotive applications exploit its weight savings to increase range and efficiency. Sports equipment—bicycles, racquets, fishing rods—benefit from tailored stiffness and vibration damping. Marine hulls, wind turbine components, prosthetics and musical instrument bodies are other common uses. Hybrids combining carbon with glass, aramid (Kevlar) or metals are used when impact resistance or cost trade-offs are required.

History, limitations and recycling

Developed and commercialized in the mid-20th century, carbon-fibre composites matured through advances in fibre production and resin chemistry. Major limitations include high material and processing costs, challenges in repair and joining, and limited recyclability compared with metals. Ongoing research focuses on lower-cost fibres, out-of-autoclave processing, and methods to reclaim fibres from end-of-life components.

Notable distinctions and practical considerations

CFRP differs from glass-fibre and metal alternatives not only in mechanical performance but in failure behavior: damage may be internal delamination rather than visible plastic deformation. Design must account for anisotropic properties, galvanic corrosion when attached to metals, and inspection techniques such as ultrasonic testing. For manufacturers and users seeking deeper technical or procurement guidance, consult specialist sources and standards.

Further resources and references (illustrative):