Is Cotton and linen plastic?
The short answer
No. Cotton and linen are cellulose fibres — they shed fibres, and those fibres are not microplastics. Blends are the trap: a 60/40 cotton-polyester shirt sheds polyester.
Also called: natural fibres, cotton vs polyester, linen, do natural fabrics shed microplastics
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
- None
Do acidic contents attack the surface?
What Cotton and linen actually is
Plant fibres spun into yarn. They are the alternative to polyester in the one exposure route textiles dominate: indoor air and household dust. Their footprint arguments — water use for cotton, in particular — are real and are a separate subject from what is in the air in your bedroom.
Where you find it
Why Cotton and linen is not a microplastic source
Cellulose fibres shed in the wash and in wear like any fibre, and they biodegrade rather than persisting as synthetic particles. The two things to check on a label: the blend percentage, and finishes — "wrinkle-free", "water-repellent" and "stain-resistant" treatments on a cotton garment are typically synthetic polymer or fluorochemical coatings applied to a natural fibre.
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
Care label percentages — anything under 100% is a blend
Natural fibres char and smell of paper when singed; synthetics melt into a bead
Performance finishes are usually advertised, which makes them easy to avoid
This is what we recommend switching to
Cotton and linen is the alternative named on 3 other material pages — Polyester, EVA, Polyurethane. There is no upgrade from here.
Products we've scored involving Cotton and linen
Each with its own 0–100 exposure score, evidence grade and sources.
Polyester activewear
Polyester or polyester-elastane knit
Grade A · 86%
Disposable face mask
Melt-blown polypropylene non-woven, three layers
Grade C · 58%
Polyester bedding
Polyester sheets, duvet fill and pillows
Grade B · 70%
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
Zangmeister 2022 (NIST) — Nylon bags, LDPE food-storage bags and similar single-use plastics shed trillions of sub-100 nm particles per litre in ordinary contact with water.
Limitation: Deionised water at controlled temperature. Nanoparticle counts are inherently large numbers; the study is about their existence and quantity, not their fate in the body.
Nihart 2025 (Nature Medicine) — Measured higher plastic concentrations in brain tissue than in liver or kidney, rising roughly 50% between 2016 and 2024 samples.
Limitation: Post-mortem tissue with no exposure history, and the analytical method has been publicly challenged by other researchers. Treat the direction as informative and the absolute numbers as contested.
Frequently Asked Questions
Is Cotton and linen a plastic?
Is Cotton and linen free of microplastics?
What should I use instead of Cotton and linen?
How do I know if something is made of Cotton and linen?
Related materials
Hardwood
No plastic to shed. Wood was the comparison arm in the study that measured plastic cutting boards, and it is the reason that study reads the way it does — a wooden board generates wood particles.
Bamboo composite
Depends entirely on the product, and the marketing will not tell you. Bamboo boards are strips glued with resin. "Bamboo fibre" tableware is usually bamboo powder bound in melamine resin — which is a plastic dish with bamboo in it.
Paper and paperboard
Uncoated paper sheds no polymer. The problem is that most paper that touches food is not uncoated — cups, cartons and many takeaway boxes carry a polyethylene or PLA lining you cannot see.
Beeswax wrap
No polymer. A beeswax wrap is cotton impregnated with beeswax, tree resin and oil — the direct replacement for the one kitchen product with the highest food-contact surface area of all.
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