Stone frying pans at €21, €29 and €37: doubts over their coating

Stone frying pans: the coating nobody really understands

Is it worth paying €21, €29 or €37 for a frying pan with a stone coating? That's the question anyone browsing the shelves at Carrefour asks when they read "dietetic, healthy, highly resistant and very non-stick". The product is called Kitchen Pro, comes in three sizes —20, 24 and 28 centimetres— and promises what no frying pan has ever fully delivered: that nothing sticks and that it lasts. The fine print, as almost always, qualifies the miracle: the packaging says a "stone finish", not a pan made of stone.

What the stone coating actually is

Nobody disputes that the pan isn't made of stone. Stone is porous, and a porous material cannot be non-stick on its own. What it has is an aluminium base with a layer of mineral powder —hence the name— and a non-stick treatment on top, free of PFOA. That detail matters: PFOA is a by-product of manufacturing PTFE, the old-fashioned Teflon, and its absence doesn't automatically make the product harmless. It only means that particular compound wasn't used in the process.

The confusion between ceramic, stone and titanium is the industry's big business. A ceramic pan is a pan with a mineral coating, just like the stone one. And titanium pans, the most expensive on the market, contain titanium plus a layer of patented non-stick coating whose composition is never published. Titanium on its own isn't non-stick either.

How long a non-stick pan really lasts

Here come the awkward testimonials. One user who has had two of these pans for just over a year says the small one, used twice a day, has already lost its non-stick properties. Another person recounts that a relative threw their ceramic pans away after six months. And a third concludes that no pan sticks when it's new: the problem appears at the six-month mark.

Wear isn't just about the material. Those who use them over high heat with metal utensils end up scratching the coating. Those who clean them while hot, with water and a cloth, before the grease dries, keep them in better shape. Non-stick isn't a permanent property of the object: it's maintenance.

The warning from those who've already been burned

The harshest experience comes from someone who grilled chicken breasts without oil on the second day of using the pan: the result was stuck, blackened food. Their conclusion is that the product is a scam and that a cheap three-euro pan at least doesn't pretend to be anything else. Another participant adds that, with the fat and water released by meats, almost nothing sticks; the real problem is chicken breasts, where two drops of oil are enough to prevent it.

Some go further and avoid cooking over very high heat with these pans for antiestéticar of gases being released. It's a reasonable precaution, not proof of toxicity. The question of whether the coating is carcinogenic remains unanswered, and the material in the debate doesn't settle it.

The cast iron and steel alternative

Against the planned obsolescence of non-stick coatings, one camp defends mineral cast iron and stainless steel pans: they don't scratch, don't wear out and last for decades if cared for. The method is different: wash them right after use, with hot water and a little soap, dry them and rub them with a drop of oil. The non-stick layer builds up with use, it doesn't come from the factory.

The problem with these pans is the handle. Several accounts agree: the coating holds up, but the handle loosens, wobbles or breaks. An expensive cast iron pan ended up with its handle snapped in two. The weak point isn't the surface, it's the joint.

What to buy depending on how you'll use it

For everyday grilling and quick cooking, non-stick still wins on convenience. For high heat, stews and durability, steel or iron are more reliable. The stone pan sits somewhere in between: better than cheap Teflon in terms of sturdiness, worse than iron in longevity, and with the same chemical unknown as any patented coating.

The advertising says "dietetic". A frying pan doesn't make anyone lose weight. What it does do is allow cooking with less oil, and that's all there is behind the claim. The rest is marketing with rocks.