Carbon Fibres

Five times stronger than steel, at a fraction of the weight — carbon fibre starts as an ordinary spool of synthetic thread, and ends up cooked, stripped, and rewoven into some of the strongest material humans make.

Carbon fabric woven on an industrial loom, University of Manchester. Composite structures made from woven carbon fibre are used in aeroplanes, cars, and wind turbines. Photo: Christine Twigg / Wikimedia Commons, CC BY-SA 4.0.

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Carbon Fibre

From PAN thread to aircraft-grade composite

Made FromPAN precursor, stabilised then carbonised

Key PropertyHigh strength, very low weight

Used InAircraft, cars, wind turbines, sports goods

Not Single-UseRecyclable via pyrolysis

Did you know? Carbon fibre is over 90% pure carbon after carbonisation, yet starts life as an ordinary synthetic polymer thread.

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📑 Contents

1Must Know
2Good to Know
3Great to Know
4Test Yourself
5Previous Year Question

🏛️ Must Know

What Carbon Fibre Is and How It’s Made

Definition Carbon fibre is a thin, strong strand of material made almost entirely of carbon atoms, typically woven into fabric and set in resin to form a lightweight, high-strength composite.
PAN Precursor Most commercial carbon fibre is made from polyacrylonitrile (PAN), a synthetic polymer, which is the dominant “precursor” material for high-strength carbon fibre production.
Stabilisation The PAN precursor fibre is first heated in air at 200–300°C, converting its chemical structure into a heat-stable “ladder” form that can survive much higher temperatures without burning.
Carbonisation The stabilised fibre is then heated further, without oxygen, to temperatures often exceeding 1,000°C. This carbonisation step drives out non-carbon elements, leaving behind a fibre that is over 90% pure carbon.

🏘️ Good to Know

Properties and Applications

Strength-to-Weight Carbon fibre combines high tensile strength and stiffness with very low density — its defining advantage over metals like steel and aluminium in weight-sensitive designs.
Aerospace Modern aircraft, including the Boeing 787, use carbon fibre composites extensively in their airframes to cut weight and improve fuel efficiency.
Automobiles and Sports Goods Carbon fibre reinforces automobile body panels, bicycle frames, tennis rackets, golf clubs, and other sporting goods where light weight and rigidity both matter.
Wind Turbines Long wind-turbine blades use carbon fibre composites for the stiffness needed to resist bending under wind load without adding excessive weight.
Medical and Marine Uses Carbon fibre also appears in medical devices like prosthetic limbs and X-ray equipment components (it’s largely transparent to X-rays), as well as in boat hulls and masts.

⚡ Great to Know

Recycling: Not a Single-Use Material

Recyclable Carbon fibres are NOT single-use once incorporated into a product — they can be recycled, most commonly via pyrolysis, which recovers fibres from carbon-fibre-reinforced plastic waste for reuse in new composites.
Recovery Rate Pyrolysis-based recycling can recover fibres retaining up to around 90% or more of virgin-fibre strength, though some quality loss is typical.
Where Recycled Fibre Goes Recycled carbon fibre is repurposed as thermoplastic or thermosetting composites across the automotive, sports, construction, aerospace, and electric-power sectors, often at 20–40% lower cost than virgin fibre.

Test Yourself

📝 Previous Year Question

UPSC CSP 2023 — Carbon Fibres Statements

UPSC 2023 Statement 1 (used in automobile and aircraft components) is correct. Statement 2 (cannot be recycled) is false — carbon fibres can be recycled, most commonly via pyrolysis. See UPSC CSP 2023 GS Paper I, Q53.

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