Science & Technology / Materials — UPSC Mains Model Answer

CFRPs deliver a strength-to-weight ratio significantly higher than conventional steel and aluminium, making them indispensable in aerospace, automotive, and defence manufacturing. This weight reduction directly translates into lower fuel consumption and reduced operational carbon emissions over a product's service life, offering a net climate benefit during use-phase.

The dominant manufacturing route relies on polyacrylonitrile (PAN) as a precursor, which undergoes energy-intensive stabilisation and carbonisation processes at high temperatures. This upstream energy burden, often met by fossil fuels, substantially offsets the downstream emission savings, creating a lifecycle tension that policymakers must account for in green procurement frameworks.

Unlike metals, CFRPs cannot be recycled through conventional mechanical processes without significant degradation of fibre length, alignment, and tensile strength. Emerging thermal and chemical recycling routes — such as pyrolysis and solvolysis — can recover usable fibres but remain costly and are not yet deployed at industrial scale.

Separating carbon fibres from the thermoset polymer matrix at end-of-life is technically difficult, leading to large volumes of composite waste entering landfills. As aerospace fleets and wind turbine blades reach decommissioning age, this challenge will intensify, necessitating extended producer responsibility regulations and investment in recycling infrastructure.