Latest / The Manufacturing Podcast with Fexingo: Factories, Supply Chains, and Industrial Business / How a German Factory Is Making Leather from Apple Waste
Transcript
- Lucas: So about ninety minutes northeast of Munich, in a town called Landshut, there's a factory that takes something you'd normally throw away — apple pomace, the mashed-up skins, seeds, and pulp left after juicing — and turns it into what looks and feels like leather. Luna: I've heard of mushroom leather, pineapple leather, even cactus leather. But apple waste? That's a new one. How much of this stuff are we talking about? Lucas: Globally, the juice and cider industry generates roughly four million tons of pomace every year. Most of it gets composted, fed to livestock, or just rots in landfills. This company — it's called Frumat, spun out of a materials science lab at the Technical University of Munich — figured out a way to turn that pomace into a sheet material they call AppleSkin. Luna: And it's not just a lab curiosity? They're actually producing at scale? Lucas: Yeah, they're running a full production line right now. They process about thirty thousand tons of pomace annually, sourced from orchards and pressing facilities within a hundred-kilometer radius of the factory. That's roughly the waste from thirty million apples. And they're producing about four hundred thousand square meters of AppleSkin per year. Luna: Four hundred thousand square meters — that's enough to cover about fifty-six football fields. Who's buying it? Lucas: Big names. Hugo Boss started using AppleSkin in some of their shoe linings last year. Adidas has a pilot program for a limited-edition sneaker upper. And there's a German automotive supplier evaluating it for interior trim — though that's still under wraps. The material costs about eighteen to twenty-two euros per square meter, which puts it in the same range as mid-grade synthetic leather but with a much lower carbon footprint. Luna: What's the actual process? I imagine you can't just dry out apple pulp and call it leather. Lucas: No, it's more involved. The pomace arrives wet — about seventy percent moisture. First they dry it, then grind it into a fine powder. That powder gets mixed with a polyurethane binder — about thirty percent binder by weight — and then spread onto a backing fabric, usually a recycled polyester. The coated sheet goes through an oven, then a pressing roller that embosses a grain pattern. After that, it's dyed, finished, and rolled. Luna: So it's not fully organic — there's still plastic in it. Lucas: Correct. It's a composite. Frumat is working on a binder made from a bio-based polyurethane, but they're not there yet commercially. The current material is about seventy percent apple waste, thirty percent synthetic binder. From a lifecycle perspective, the carbon footprint is roughly sixty percent lower than cow leather and about forty percent lower than conventional synthetic leather, according to their own third-party audit. Luna: That's significant, especially with the EU's upcoming digital product passport rules. Brands are going to need that kind of data. Lucas: Exactly. And the factory in Landshut is designed to be energy-efficient. They use a heat-recovery system on the drying ovens, and the facility runs on one hundred percent renewable electricity from a nearby hydro plant. They also sell the pomace byproducts — the apple seeds go to a cosmetic company for oil extraction, and some of the fiber goes into animal feed. Almost nothing goes to waste. Luna: It's a mini circular economy inside a factory. What's the bottleneck? Why aren't they scaling faster? Lucas: The main bottleneck is the drying step. Pomace is seasonal — you get most of it in the late summer and autumn harvest. So you need huge drying capacity to process the peak supply, and that equipment is expensive. Frumat raised about twelve million euros in Series A funding last year, mostly for expanding their drying line. They're also experimenting with a new microwave-assisted drying technique that could cut energy use by another thirty percent. Luna: Any competitors in this space? I know there's a company in Italy making leather from grape waste. Lucas: Yeah, Vegea is the grape-leather company, based in Milan. And there's a Finnish startup called Spinnova that makes fiber from wood pulp. But Frumat's patent is specifically on the processing of high-moisture fruit pomace. They've filed four patents on the drying and milling method and the binder formulation. The moat is in the consistency of the final sheet — getting the tensile strength and feel right batch after batch is harder than it sounds. Luna: I imagine the fashion industry is particular about that. One bad batch and a brand walks. Lucas: Absolutely. Hugo Boss did three rounds of sampling over eighteen months before they committed. Frumat's quality control lab tests every production roll for thickness, tear resistance, color fastness, and flexibility. They reject about six percent of output — which is actually better than the industry average for synthetic leather, which runs around ten to twelve percent. Luna: Six percent reject rate is impressive for a relatively new material. What's the next step for them? Lucas: They're planning a second factory in France, near Normandy's cider region, to be closer to the apple supply. That line should come online in early 2027 and double their output to eight hundred thousand square meters per year. They've also started trials with pear and grape pomace to diversify feedstock. The goal is to become a one-stop shop for fruit-waste leather alternatives. Luna: It's a smart strategy — don't put all your apples in one basket, so to speak. Lucas: Nice. And the economics are improving. Last year Frumat reported gross margins of thirty-four percent, up from twenty-two percent the year before. As they scale, the binder cost becomes a smaller share. If they can get to a fifty percent gross margin, they'll be competitive with mid-range synthetic leathers on price without needing a green premium. Luna: That's the holy grail for sustainable materials — price parity without a subsidy. Speaking of which, this kind of deep-dive manufacturing story is exactly why we keep this podcast ad-free. Lucas: Yeah, we deliberately don't run ads. It means we can spend the whole episode on the technical details without breaking for a mattress commercial. If you find value in that and want to support it, there's a link: buy me a coffee dot com slash fexingo. No pressure, just a way to keep the show independent. Luna: And it helps us cover the research time. These episodes take a while to put together. Anyway, back to apple leather — one thing I'm curious about: does the final material smell like apples? Lucas: Surprisingly, no. The drying and binder process eliminates almost all the organic volatile compounds. The finished roll has a faint neutral smell, like new upholstery. But the factory floor itself, when the pomace first arrives — that smells like a cider press. Fermented apples, yeast, a bit sour. The workers wear respirators in the receiving area. Luna: So the raw material has a strong personality. How do they handle the seasonal glut? I imagine October is chaos. Lucas: October and November are peak season. They bring in temporary workers, run the drying line twenty-four seven, and stockpile dried pomace powder in silos that can hold about three months' worth. That smooths out production through the rest of the year. They've also signed contracts with juice producers to take pomace year-round from cold-stored apples, but that's a smaller stream. Luna: Smart. So the supply chain is built around the harvest rhythm. How does Frumat compare to traditional leather tanneries in terms of water usage? Lucas: Dramatically better. A conventional cowhide tannery uses about forty to fifty liters of water per square meter of leather produced. Frumat's process uses about eight liters per square meter, mostly for cleaning the equipment. And they don't use chromium or other heavy metals. The wastewater is mainly organic sugars and starches from the apple, which they treat in an on-site biological digester. Luna: That's a huge environmental win. Are there any drawbacks to AppleSkin compared to animal leather? Lucas: Durability is one. AppleSkin has about eighty percent of the tensile strength of cow leather, so it's not ideal for heavy-use items like work boots or belts. It also doesn't develop a patina the way natural leather does — it wears more like a synthetic. But for shoes, bags, upholstery, and automotive interiors, it's more than adequate. Frumat is working on a thicker version for automotive use that has a foam core. Luna: So they're iterating. It sounds like they have a clear product roadmap. Lucas: They do. And they're also exploring a version with a bio-based backing instead of recycled polyester. That would push the biobased content to over ninety percent. But the backing fabric is a cost and performance trade-off — polyester gives the material dimensional stability. They're testing a hemp-fiber backing that could work. Luna: Hemp would be a natural fit, grown locally in Europe. I'm imagining a fully compostable apple leather at some point. Lucas: That's the long-term vision. But for now, the focus is on scaling and proving the reliability to big buyers. Landshut is a showcase — they do about forty factory tours a month for brand procurement teams, sustainability officers, and journalists. It's a working factory that doubles as a sales tool. Luna: I'd love to see it. One last question — what's the cost of a square meter to the end consumer, say in a pair of shoes? Lucas: Rough estimate: if a shoe uses about half a square meter of material, the AppleSkin cost is around ten euros. In a pair of Hugo Boss sneakers that retail for about two hundred fifty euros, the material cost is a small fraction. The brand value is in the sustainability story, not the material saving. Luna: Which is fine — as long as the story is backed by real numbers. And from what you've described, Frumat has them. Lucas: They do. And they're transparent about it. The factory publishes an annual sustainability report with third-party audits, water usage, carbon footprint, waste diversion rates. It's a level of disclosure you don't always see in this space. Luna: That builds trust. And for a material that's still relatively new, trust is everything. Lucas: Exactly. And if they hit their targets for the French factory, we'll be talking about apple leather as a mainstream option within three years. Luna: I'll be watching. Thanks, Lucas. Lucas: Thanks, Luna. And thanks to everyone listening. That's the manufacturing story from Landshut.