Sub-system
Composite structures are made from three purchased things: fibre, the resin that binds it, and the core that separates skins in a sandwich. All three are qualified per programme, all three come from a short list of producers, and aerospace competes for them with wind energy and hydrogen storage.
In one sentence
Composite materials for structural use comprise reinforcing fibres — carbon or glass — the polymer matrix that binds them, often pre-combined as prepreg, and the lightweight core materials used between skins in sandwich construction.
Carbon fibre is made by drawing a polymer precursor into filaments and heating them in stages until almost everything but carbon is driven off, leaving aligned graphitic chains. It is energy-intensive, takes hours, and the precursor is itself a specialised product — which is why capacity is added slowly and why fibre grades are not interchangeable.
For aerospace the fibre is usually supplied as prepreg: fibre already impregnated with a precisely metered amount of partially cured resin, shipped and stored frozen so it does not advance before use. That frozen shelf life is a real logistics constraint, and it is one of the practical differences between aerospace and wind, where dry fibre infused with resin at the mould is more common.
A material is approved for a specific structure, made by a specific process, after a test pyramid running from coupons through elements to full-scale articles. That evidence belongs to the programme, so a second source is a multi-year qualification exercise even when the alternative fibre is nominally equivalent.
Wind blade spar caps, aerospace primary structure and hydrogen pressure vessels all want intermediate-modulus carbon fibre from the same producers. When one sector grows quickly the others feel it, which is why aerospace supply plans now track wind installations.
Sandwich structures use balsa or polymer foam between skins. Balsa is an agricultural product with a growth cycle measured in years and a concentrated growing region, and it has been genuinely short. Foam alternatives exist and have to be qualified into each structure, which is the same slow substitution as everywhere else here.
Technology dependencies are solved by engineering; supply dependencies are solved by building something, which takes years.
Fibre production consumes a specialised polymer precursor and a great deal of heat, both of which constrain how quickly capacity expands.
Prepreg is shipped and stored frozen with a finite out-life; the logistics are part of the material's usability.
A fibre or resin is approved for a named structure and process, backed by a test pyramid the regulator accepts. Without that evidence the material cannot be used however good its datasheet is.
Other pages in this map that name Composite materials as something they cannot do without.
What each company supplies at this step, and — where a public figure exists — its share of this specific market — with what that share measures, the period it covers and who published it. Some rows also show the company’s own reported revenue for the segment covering this step, which is a different thing: it says how much this business matters to that company, not how much of the market it holds. Not a ranking and not a recommendation.
The largest producer of aerospace-grade carbon fibre and prepreg.
Produces carbon fibre, prepreg and honeycomb core for aerospace and industrial use.
Commercial Aerospace Market Applications segment — 60.6% of Hexcel’s reported revenue ($1.1B)FY2025 · company filings · not a market share
Produces carbon fibre and composite materials.
Produces carbon fibre and composite intermediates.
Supplies the epoxy prepregs and adhesives the fibre has to be combined with before it is a structure.
Supplies carbon fibre and the graphite tooling that the parts are cured against.
Supplies core materials and structural adhesives across the aerospace and wind uses of the same chemistry.
Supplies industrial-grade carbon fibre at the volume end, which is where price for the whole chain gets set.
Whether fibre capacity expansion keeps pace with combined aerospace, wind and pressure-vessel demand.
Whether out-of-autoclave and dry-fibre processes reduce dependence on frozen prepreg.
Whether core material supply diversifies away from its concentrated agricultural base.
Each page explains one technology in plain language, states what it depends on, and names companies by what they supply at that step. Company roles are described qualitatively and deliberately carry no market shares, revenue figures or rankings — those change faster than an explainer can, and a stale number is worse than none. Ticker links point at company pages on this site and are provided for reference only.
Nothing here is investment advice, a recommendation, or a forecast. A company named on a page about a technology is not thereby a good investment, and the chokepoints described are structural facts about supply chains rather than predictions about prices. Technology moves; where a page describes something as unresolved or in development, that was true when it was written.