TOTO: From Toilets to E-Chucks

ELI5 / TLDR

TOTO is the Japanese company that makes those fancy heated bidet toilets. It turns out the same company is also the world’s leading supplier of a tiny, obscure ceramic part that semiconductor factories use to hold silicon wafers perfectly still while they get carved into memory chips. That part — an “electrostatic chuck” — now throws off somewhere between a third and a half of TOTO’s profits. The thread connecting toilet bowls to cutting-edge chips is the same one running through the whole 120-year story: TOTO is really good at making things out of fired clay, and keeps finding new problems that skill can solve.

The Full Story

A trading company that learned to fire clay

TOTO’s origin is not a toilet. It’s a 19th-century merchant named Ichizaemon Morimura who decided, around 1876, that the only way to stop gold draining out of a newly-opened Japan was to sell things abroad. He set up a shop in New York and eventually landed on a winning product: Western-style tableware, made in Japan, cheap enough for America’s growing middle class, and sold through the Sears mail-order catalogs.

The problem was that Japanese porcelain at the time was grayish-blue, thick, and brittle. American buyers wanted thin, hard, white porcelain — white so you could paint flowers on it. Making that turned out to be brutally hard. The Morimura Group spun off a dedicated company, Noritake, and spent the better part of a decade failing at it. Add one mineral to get the white color and the clay sagged in the kiln. Add another to keep it rigid and the white disappeared. They eventually sent their chief engineer to a German research institute, got the recipe fixed, and shipped their first white dinner set in 1914 — right as World War I cut off the European competition. Exports jumped twentyfold in four years.

That decade of clay-chemistry pain is the real seed of everything that follows.

From dinner plates to the porcelain you sit on

A toilet bowl is, technically, a nightmare. It’s one large piece of porcelain full of curves, and it has to do several contradictory things at once. Here’s the engineer Asianometry lays out:

What makes a good porcelain? To start, it cannot leak. It should have good strength and cannot warp very much… The toilet porcelain should not absorb water. Imagine the smell if it did!

In 1912 Kazuchika Okura pushed the group to make one anyway, betting that modern flush toilets were part of Japan modernizing. Early bowls couldn’t be cast in one piece — the curves made wet clay collapse — so craftsmen pressed flat strips of clay onto wooden molds by hand. It took 17,280 test firings to get the mix right. A new factory on Kyushu opened in 1917, and the company running it was named Toyo Toki (“Eastern Porcelain”), shortened later to TOTO.

The leap to mass production came from slip casting: instead of pressing clay by hand, you pour a clay slurry into a porous mould that soaks up the water and leaves a solid shell behind. Sounds simple, except clay shrinks 3% as it dries and another 10% when fired, so mould-makers had to deliberately build distortions into their designs to compensate. TOTO cracked this by 1920.

War, the bomb that missed, and learning metal

TOTO survived the interwar years on Japanese reconstruction after the 1923 Great Kanto Earthquake (which mandated concrete buildings with plumbing) and a 1930s construction boom in occupied Manchuria. Then came WWII, when its Kyushu factories were converted to making weapons. That conversion nearly erased the company: the city of Kokura, home to TOTO’s main plant and a nearby armory, was the primary target for the second atomic bomb in August 1945. Cloud cover and smoke saved it; the bomb went to Nagasaki instead.

After the war, the American occupation ordered buildings retrofitted with Western flush toilets, and TOTO got the orders. But a Western toilet isn’t just a bowl — it’s the metal fittings that anchor it, connect the plumbing, and do the flushing. TOTO had always bought those from an outside supplier. Now, forced to make their own, they became a fully integrated maker that could sell the whole package. By the mid-1960s they held roughly 60% of the Japanese toilet market.

The Washlet: surveying 300 employees’ backsides

The famous heated bidet seat had a rough start. TOTO licensed an American “Wash Air Seat” in 1964, but it was expensive and the water temperature swung wildly — sometimes scalding. The novelist Shūsaku Endō wrote a gleefully savage review about hot water assaulting his anus. By 1979 it sold 500 units a month.

So TOTO redesigned it from anatomy up. To find where the nozzle should aim, the development team built a test seat with a wire across it and had staff mark where people’s anatomy landed — eventually surveying 300 employees (with permission) for measurements and temperature preferences. The result was a spec list of almost comic precision: seat at 36°C, water at 38°C, nozzle flow of 500 cc/minute at a 43-degree angle.

The hard engineering was the temperature. The old seat used a crude mechanical switch — a strip of two bonded metals that bend as they heat — which is why the water swung hot and cold. TOTO wanted to replace it with proper electronics: integrated circuits and temperature sensors that constantly sample and adjust. The catch was protecting those chips from water and salty urine. An engineer solved it by noticing a traffic light surviving wind and rain outside, then partnering with its maker to seal the chips in resin the same way. The Washlet launched in 1980, hit a million units by 1987, and twenty million by its 25th year.

The chuck

Note that protecting chips with ceramics and resins is itself a semiconductor-adjacent skill. As Japan’s cheap-energy growth model stalled in the 1970s, TOTO began pointing its century of materials knowledge at chip factories — precision measuring stages, ceramic substrates, packaging. In 1984 it formed a fine ceramics division.

That same year, NTT Laboratories (Japan’s Bell Labs) asked TOTO to build a chuck — the part that holds a silicon wafer dead still inside a machine while it’s being processed. NTT’s tool used an electron beam, which rules out the usual options: a mechanical clamp scratches the wafer and makes yield-killing particles, and a vacuum gripper can’t work in the vacuum the beam needs. The remaining option is electrostatic — the same force that lets a charged balloon lift bits of paper.

The young researcher Toshiya Watanabe first assumed it worked by simple charge attraction (the “Coulombic” way) and calculated that hitting NTT’s required strength would need an impossibly thin ceramic plate. Confused, he went back to NTT, who explained they meant something different. The trick: make the ceramic slightly leaky to electricity. A tiny current then seeps to the surface touching the wafer, turning that surface into a “virtual electrode” sitting just micrometers away — and the closer the opposing charges, the stronger the grip. This is the Johnsen–Rahbek effect, named after two Danish engineers in the 1920s. Watanabe’s team got there by carefully doping aluminium-oxide ceramic with additives like titanium oxide until the recipe was right.

Electron-beam lithography lost out to conventional methods, so TOTO repurposed the chuck for plasma etch machines — the harsher step that physically cuts the chip pattern. It was punishing: chucks cracked inside chambers and stopped customers’ production lines. But the years of solving those failures hand-in-hand with customers are exactly why TOTO’s chucks keep getting written into new chip recipes. Today they dominate supply to Lam Research for the cryogenic etching used to bore the deep, narrow holes in 3D NAND memory — etching done at –70°C or colder, where making a ceramic behave is even harder. Hence, as the man says, why it earns so much of the profit.

Key Takeaways

TOTO’s electrostatic chucks contribute an estimated 30–50% of company operating profit, and a 2026 British hedge-fund letter is what spotlighted this hidden business.
The whole company traces back to one skill compounded over a century: making things out of fired clay (porcelain and advanced ceramics).
White porcelain for tableware (1913), single-piece toilet bowls (1914), slip-casting (1920), metal fittings (postwar), and chip-grade ceramics are successive applications of that same core competence.
A chuck holds a wafer steady during processing; mechanical ones scratch, vacuum ones fail in a vacuum, so electrostatic clamping wins for the toughest tools.
The Johnsen–Rahbek effect: a slightly conductive (“leaky”) ceramic moves charge to its surface, forming a virtual electrode microns from the wafer for a much stronger grip than plain charge attraction.
TOTO’s main factory city, Kokura, was the primary target for the second atomic bomb; cloud and smoke diverted it to Nagasaki.
The Washlet’s specs came from surveying 300 employees’ anatomy and temperature preferences; its chips are protected by resin encapsulation borrowed from traffic-light electronics.
TOTO’s self-framing: not a toilet company but “a technology company with an expertise in porcelains” — the same posture Asianometry attributes to FujiFilm versus Kodak.

Claude’s Take

This is Asianometry doing what it does best: taking a “wait, what?” headline (toilet company secretly runs a chip-tool monopoly) and showing the connection was obvious all along once you see materials science as the throughline. The structure is the argument — by the time you reach the chuck, you’ve already watched the company solve five hard ceramics problems, so the sixth feels inevitable rather than random.

It earns an 8. The history is well-sourced (he flags triangulating TOTO’s own 822-page centennial book against other accounts, and cites Watanabe’s own 2025 retrospective for the chuck section), and the Johnsen–Rahbek explanation is genuinely clear — the leaky-dielectric “virtual electrode” idea is the kind of thing most write-ups would either skip or botch. Points off only because the semiconductor payoff, the actual reason you clicked, arrives in the last quarter and stays fairly brief; the 3D NAND cryo-etch section is openly a teaser for a future video. The toilet history is delightful but it’s the larger share of the runtime. No real BS to filter — the one soft spot is that profit figure (“30 to 50%”) comes via an activist hedge fund with an agenda, and he repeats it without independent confirmation. Worth watching for the storytelling alone.