Diana (35) bought a milk frother for the perfect foam. What she didn’t know: every morning, she was also drinking from the coating.
The story of a woman who, after 3 years of daily use, discovered what was in the non-stick coating of her milk frother. And why that matters to you too.
It started with a cappuccino
Three years ago Diana bought a milk frother. One of those big black things with a dial and icons on the front. She’d ordered it from a well-known brand; it looked great next to her coffee machine.
Every morning the same ritual. Make espresso. Pour in milk. Press the button. Two minutes later: thick, creamy foam. Pour, enjoy. Sometimes twice a day. On weekends, hot chocolate for the kids.
The milk frother Diana used daily for 3 years
After about a year she started to notice it. The foam got thinner. The milk burned on faster. And when she looked inside, she saw scratches. Tiny spots where the black layer had become thinner.
She thought: wear and tear. Normal. Time for a new one.
What she didn’t know: that “wear” hadn’t just disappeared. It was in her milk. And so in her cappuccino. Every morning. For more than a year.
“I realized I’d let hot milk spin against that coating 730 times a year. And that the coating had released particles. Into the milk I drank. And that my children drank.”
Diana, 35The discovery
It started with a conversation at a birthday party. A friend said she had thrown out all her pans. “Because of PFAS,” she said.
Diana nodded politely. She didn’t really know what it was. That evening she googled it.
PFAS. Chemicals used in non-stick coatings. Not just in pans. Also in milk frothers. Rice cookers. Airfryers. Anywhere there’s a smooth, dark coating that keeps food or milk from sticking.
The inside of a milk frother. That smooth, dark layer? That’s the coating.
Her milk frother—that big black device she poured milk into every morning—had exactly such a layer. On the inside. Right where hot milk spun against it at 800 revolutions per minute.
What Diana discovered back then
- The non-stick coating in most milk frothers contains PFAS substances
- Heat speeds up the breakdown of this coating (milk is heated to 65-70 degrees)
- The spinning whisk slowly damages the coating, causing microparticles to come loose
- Those particles end up in your milk — and therefore in your body
- “PFOA-free” does not mean PFAS-free. There are more than 10,000 different PFAS substances
Many brands advertise “PFOA-free.” That sounds reassuring. But PFOA is just één of the more than 10,000 PFAS substances. A product can be PFOA-free and still be full of other harmful PFAS compounds. Compare it to a cigarette without tar — it still contains thousands of other harmful substances.
What exactly is PFAS?
PFAS stands for poly- and perfluoroalkyl substances. It’s a group of thousands of man-made chemicals that have been used since the 1950s.
They’re also called “forever chemicals.” Not without reason: PFAS doesn’t break down. Not in nature. Not in your body. Once it’s in, it stays there. For years. Sometimes for decades.
Where is it found?
- Non-stick coatings on pans, milk frothers, and air fryers
- Water-repellent clothing and shoes
- Food packaging (pizza boxes, baking paper)
- Cosmetics and toothpaste
- Drinking water in certain regions
But here’s the point: most of those products don’t come into daily contact with hot liquids that you then drink. Your milk frother does.
If you use your milk frother 2x a day, hot milk comes into contact with the coating 730 times a year. Over 3 years, that’s 2,190 times. With every heating, microparticles from the coating can come loose, especially if the layer is already damaged.
So why do manufacturers use it?
Simple: it’s cheap and it works. PFAS makes sure milk doesn’t stick, the inside is easy to clean, and the product looks “premium” right after purchase.
That smooth, dark layer looks luxurious. But that layer isn’t permanent. It wears down. And what wears off doesn’t just disappear — it has to go somewhere.
In this case: in your milk.
The risks
Source: RIVM, European Commission, independent researchers
Diana isn’t a scientist. But this is what the RIVM, the European Commission, and independent researchers say about long-term exposure to PFAS:
What PFAS does in your body
- Hormone disruption — PFAS can disrupt the action of estrogen and thyroid hormones
- Thyroid problems — increased risk of an underactive or overactive thyroid
- Immune system — reduced function, less effective vaccinations
- Fertility — linked to reduced fertility in both men and women
- Cholesterol — increased cholesterol levels, even at low exposure
- Cancer — certain PFAS substances have been classified by the IARC as "possibly carcinogenic"
The problem with PFAS isn’t one single exposure. The problem is the build-up. A tiny amount every day, for years, from multiple sources at once. Your milk frother is one of them—and possibly the most underestimated.
Why milk frothers are particularly risky
Not all PFAS products carry the same risk. You wear a PFAS rain jacket now and then. But you use your milk frother every day. With hot liquid. Which you then drink.
The combination of three factors makes it extra risky:
🌡️ Heat — milk is heated to 65-70 degrees, which damages the coating faster.
⚙️ Mechanical wear — the rotating whisk rubs against the coating every day.
☕ Direct intake — whatever comes off, you drink. No filter, no barrierère.
With a pan you can still say: the food touches the coating, but you don’t eat the coating directly. With a milk frother, it’s different. The liquid is the end product. Whatever is in the milk, you drink.
Spot it yourself
How do you know if your milk frother has a PFAS coating? These are the signs:
- The inside of the jug has a dark, smooth layer (black, grey, or dark grey)
- There are small scratches or light spots on the inside
- Recently, the milk burns onto it faster than it used to
- The foam is less thick than when the device was new
- The packaging says "PFOA-free" but not "PFAS-free"
- The inside feels smooth and "coated," not like pure metal or glass
Left: damaged coating after 1 year of use. Right: a glass interior without coating.
"When I turned my frother over and looked at the inside, I saw it right away. Those scratches. Those thin spots. I’d never really thought about it. But now I couldn’t unsee it."
Diana, 35The simple test
Grab your milk frother. Look at the inside of the jug. Feel it.
Is it smooth and dark? Then it’s a coating.
Is it transparent (glass) or silver-colored (uncoated steel)? Then there’s no coating.
Most milk frothers from well-known brands have a coated interior. That’s true for almost all models under €60 and for many more expensive models too.
What now?
This article isn’t written to scare you. It’s written because Diana wished someone had told her three years ago.
You don’t need to panic. You don’t have to throw everything away today. But you can make a conscious choice the next time you buy a milk frother. Or you can take a look at what you already have at home.
Three things you can do today
🔍 Check your current milk frother — look at the inside. Is there a coating? Are there scratches or wear?
📄 Read the specifications — look up whether your model is PFAS-free. Note: not PFOA-free, but PFAS-free. That’s a big difference.
📚 Compare your options — see which alternatives are available without coating. There are now several options on the market.
A milk frother without coating does exist. There are models with a glass jug, where the milk only comes into contact with glass and stainless steel. No coating that can wear out. No particles that can come loose. Simply: glass and milk. View an overview here →
"I still drink a cappuccino every morning. The difference is that now I know what’s in my cup. And what’s not in it. That gives peace of mind."
Diana, 35You can’t unknow what you know now. But you can do something with it.