Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a French Factory Is Making Car Parts from Hemp
Transcript
- Lucas: A French factory near Reims is making car door panels from hemp. Not hemp seed oil or hempcrete — the actual stalk of the plant. It replaces fiberglass in interior trim, and the numbers are genuinely compelling. Luna: Wait — hemp stalks? I think of hemp as a crop for textiles or wellness products. How do you get a car door out of a stalk? Lucas: So the company is called HempFab, founded in 2019 by two agricultural engineers. They take the long, woody core — called the hurd — and the outer bast fibers, grind them, then mix with a bio-based epoxy resin. The result is a rigid panel that weighs about 30 percent less than the fiberglass equivalent. Lucas: And here's the kicker: the manufacturing process for that panel emits roughly half the carbon dioxide of fiberglass production. The hemp itself absorbs CO2 while growing, so the cradle to gate footprint is actually negative if you account for the plant's own carbon capture. Luna: So it's carbon-negative before it even enters the car. But cost-wise, where does it land? Fiberglass is cheap — like two to three dollars a kilogram for raw material. Lucas: HempFab's costs break down roughly like this: the raw hemp fiber is about one euro per kilogram. The bio-epoxy is the expensive part — roughly four euros per kilogram. The finished panel sells to automakers for around twelve euros per kilogram. Compare that to a fiberglass panel at maybe eight to nine euros, and you're paying a thirty- to fifty-percent premium. Luna: That premium is real. Who's paying it? Lucas: So far, mainly European luxury and premium brands that want sustainability talking points. But the big shift happened in 2025 when Stellantis ran a pilot using HempFab's material for a seatback frame — not just trim, a structural part. It passed all crash tests and saved forty percent weight versus steel. That caught the attention of procurement teams. Luna: A seatback frame? That's load-bearing. How did hemp composite survive a crash test? Lucas: The key is the resin system. HempFab uses a thermoset epoxy reinforced with a woven hemp mat — think of it like carbon fiber's poorer cousin. It doesn't have the same tensile strength, but for torsion and impact absorption, it's surprisingly good. The Stellantis seatback actually outperformed steel in side-impact energy absorption because the composite crumples in a controlled way rather than bending. Luna: Okay, that's impressive. But can they scale? Right now the plant near Reims — how much capacity do they have? Lucas: About 2,000 tons of composite panels per year. That's enough for maybe 100,000 car interiors. Tiny in auto terms. They're building a second line now, tripling capacity by mid-2027. But the real bottleneck isn't factory floor space — it's the hemp supply itself. Luna: Because hemp farming isn't widespread enough? Lucas: Exactly. Hemp is a niche crop in Europe — about 50,000 hectares total, mostly in France. To scale, you need farmers to switch from wheat or corn to hemp, and that means guaranteed purchase contracts. HempFab is signing three-year agreements with cooperatives in the Grand Est region, paying a premium over commodity crops. But it's slow. Luna: What about the regulatory side? I know the EU has the end of life Vehicle Directive coming — that's a tailwind, right? Lucas: Huge tailwind. The directive mandates that 95 percent of a vehicle's weight must be recyclable or recoverable by 2030. Fiberglass is a nightmare to recycle — it's thermoset, so it can't be remelted. Hemp composite, on the other hand, can be shredded and used as filler in new panels, or composted entirely. That gives automakers a compliance incentive that didn't exist five years ago. Luna: So the premium is offset by regulatory savings. Makes sense why OEMs are looking at it now. Lucas: If today's conversation gave you a useful lens on this — maybe a new angle on materials sourcing or regulatory strategy — the way these episodes stay ad-free is listener support. You can find us at buy me a coffee dot com slash fexingo. It's a small gesture that keeps this show independent. Luna: Yeah, and it genuinely helps. We don't run sponsors, so every contribution goes directly into research and production. Lucas: Now back to the scale question. Beyond autos, HempFab is looking at the marine industry — boat hulls are another fiberglass-heavy application where recyclability is becoming a selling point. They've got a pilot with a French catamaran builder for interior panels, and if that works, the addressable market triples. Luna: What's the main technical challenge they're still wrestling with? Lucas: Moisture sensitivity. Hemp is hydrophilic — it absorbs water. In a car door, that's fine because the panel is sealed. But in a boat, the constant humidity and salt spray could degrade the fiber over time. They're developing a hydrophobic coating using a plant-derived wax, but it adds cost and complexity. Luna: So the marine application is a stretch. But if they crack that coating, it opens up construction too — think decking, cladding. Lucas: Exactly. The holy grail is structural building materials — load-bearing beams made from hemp composite. A few European startups are working on it, but nobody has a certifiable product yet. HempFab is investing in that R&D with a grant from the French government. Luna: What about the economics of the hemp supply chain itself? I mean, if the factory is buying raw fiber at one euro per kilo, what does the farmer actually get? Lucas: The farmer typically sells the whole stalk for around 200 to 300 euros per ton — so 20 to 30 cents per kilogram. The decortication — separating the bast from the hurd — is done by a processor, who sells the bast fiber for about 80 cents to a euro. HempFab then buys that processed fiber. So the value-add happens at the processing step, which is capital-intensive. Luna: That processing bottleneck is real. Europe has maybe a dozen large-scale decortication plants. Most are in France and the Netherlands. Is anyone building new ones? Lucas: Yes — several are being planned. A Dutch company called Hempro is building a facility in Groningen that will process 10,000 tons of hemp straw per year, opening in 2027. And HempFab is considering a joint venture with a German agricultural cooperative to build a dedicated decortication line next to their new factory. Luna: So the next few years will tell whether this is a niche or a real industry. But the raw material advantage — carbon-negative, lightweight, recyclable — is hard to beat if the cost curves come down. Lucas: And that's the bet. HempFab's founder told me they expect to reach cost parity with fiberglass by 2029, assuming a tripling of hemp fiber supply. If that happens, you could see hemp composites in mass-market cars, not just luxury trims. Luna: What's the one number you'd point to as the most telling indicator of whether this is working? Lucas: The adoption rate by automakers. In 2024, about 1 percent of European car interior panels used natural fiber composites. By 2026, it's projected to hit 4 percent. If we see 10 percent by 2030, that's a multi billion euro market. HempFab is positioned to capture maybe a tenth of that if they execute. Luna: And if they don't, someone else will. The technology isn't proprietary — it's the know-how in the resin formulation and the supply chain relationships. Lucas: Exactly. That's why the next 18 months are critical. Their second factory needs to come online on time, and the farmers need to see consistent demand. If both happen, hemp goes from a niche agricultural product to a genuine industrial feedstock.