Is Ceramic and stoneware plastic?
The short answer
Fired, glazed ceramic sheds no polymer. "Ceramic non-stick" cookware is a different thing — a sol-gel silica coating on metal, which is not PTFE and is also not the same as a stoneware dish.
Also called: stoneware, porcelain, ceramic coating, ceramic nonstick
How it behaves
The four conditions that decide whether a material is a problem in practice rather than in principle.
- Heat
- None
Does normal domestic heat degrade it?
- Abrasion
- None
Do scratching, cutting or flexing generate particles?
- Fatty food
- None
Does fat pull additives or particles out of it?
- Acidic food
- Low
Do acidic contents attack the surface?
What Ceramic and stoneware actually is
Clay fired and glazed to a vitrified, non-porous surface. For plates, mugs and bakeware it is inert and permanent. The confusion worth clearing up is the cookware category: pans marketed as "ceramic" are metal with a thin silica-based coating, which avoids fluoropolymers but wears out considerably faster than PTFE does.
Where you find it
Why Ceramic and stoneware is not a microplastic source
Nothing from fired, glazed ceramic. Ceramic-coated pans are a real gap: the sol-gel coating degrades faster than PTFE and has never been tested for particle release, which is a notable blank given how heavily they are marketed as the healthy alternative. The separate, older concern with imported and craft ceramics is lead in the glaze, which has nothing to do with microplastics but is worth knowing.
Graded C. No measurement of the product or its category exists. The score rests on published evidence about how this polymer behaves under these conditions — heat, abrasion, contact time, fat content. How evidence grades work →
How to tell you're holding it
A true ceramic dish chimes when tapped and is heavy for its size
"Ceramic" cookware is a metal pan with a coating — check whether it is a pan or a dish
Craft or imported glazed ware may warrant a lead check for daily food use
Switch to
Glass
No polymer touches the contents, which makes glass the cleanest widely available food material. Worth knowing: glass bottles measured around 50 particles per litre in the one study that compared formats — from the cap and the filling line, not the glass.
Cast iron
No polymer of any kind. A seasoned cast-iron or carbon-steel pan builds its own non-stick surface out of polymerised cooking oil, which is the only non-stick surface in a kitchen that is not a plastic coating.
Stainless steel
No microplastics at all — steel is a metal and cannot shed a polymer. The catch is the parts around it: a steel bottle is only as clean as its lid, and the lid is almost always plastic.
Products we've scored involving Ceramic and stoneware
Each with its own 0–100 exposure score, evidence grade and sources.
Air fryer non-stick basket
Metal basket with a PTFE or ceramic non-stick coating
Grade B · 72%
Pour-over coffee with a paper filter
Paper filter, glass or ceramic dripper and carafe
Grade C · 60%
Not sure what yours is made of?
Most products never state the polymer, and a resin code on the base only tells you about the body — not the lid, the liner or the seal. Scan the item and the app identifies the materials in it, then scores them together.
Identify what mine is made ofSources
Luo 2022 (Newcastle) — A single crack in a non-stick coating released around 9,100 fluoropolymer particles, and a surface with broken coating released up to 2.3 million during a few minutes of simulated cooking.
Limitation: A deliberately damaged coating under a controlled scraping protocol, not normal use of an intact pan. It establishes that damaged non-stick is a particle source; it does not tell you the release from a pan you have not scratched.
US FDA — States that current scientific evidence does not demonstrate that the levels of microplastics detected in foods pose a risk to human health, while listing detection and characterisation as a research priority.
Limitation: A statement about the state of evidence, not a finding of safety. "Not demonstrated to be harmful" and "demonstrated to be harmless" are different claims, and the agency is explicit that the research is ongoing.
Frequently Asked Questions
Is Ceramic and stoneware a plastic?
Is Ceramic and stoneware free of microplastics?
What should I use instead of Ceramic and stoneware?
How do I know if something is made of Ceramic and stoneware?
Related materials
Glass
No polymer touches the contents, which makes glass the cleanest widely available food material. Worth knowing: glass bottles measured around 50 particles per litre in the one study that compared formats — from the cap and the filling line, not the glass.
Cast iron
No polymer of any kind. A seasoned cast-iron or carbon-steel pan builds its own non-stick surface out of polymerised cooking oil, which is the only non-stick surface in a kitchen that is not a plastic coating.
Stainless steel
No microplastics at all — steel is a metal and cannot shed a polymer. The catch is the parts around it: a steel bottle is only as clean as its lid, and the lid is almost always plastic.
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