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ElastomersNot a plastic

Is Natural rubber plastic?

The short answer

No. Natural rubber is harvested latex from the rubber tree, not a synthetic polymer, so it is not a microplastic source. Synthetic rubber is a different material entirely and is one.

Also called: latex, natural latex, rubber teat, is rubber a plastic

How it behaves

The four conditions that decide whether a material is a problem in practice rather than in principle.

Heat
Moderate

Does normal domestic heat degrade it?

Abrasion
Moderate

Do scratching, cutting or flexing generate particles?

Fatty food
Moderate

Does fat pull additives or particles out of it?

Acidic food
Low

Do acidic contents attack the surface?

Evidence grade CGrade C — polymer evidence

What Natural rubber actually is

Polyisoprene tapped from Hevea brasiliensis and vulcanised. It appears in baby-bottle teats, pacifiers, jar seals, gloves and mattress cores. The distinction that matters on a label is natural versus synthetic: butyl, nitrile and SBR rubbers are petrochemical polymers and behave like plastics for our purposes.

Where you find it

Baby-bottle teats and pacifiersJar and bottle sealsLatex mattressesGlovesElastic

Why Natural rubber is not a microplastic source

Natural rubber degrades biologically rather than fragmenting into persistent synthetic particles, which is the property that keeps it out of this problem. It has its own separate issue — latex protein allergy — which is real, is unrelated to microplastics, and is why many teats moved to silicone in the first place.

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

This is what we recommend switching to

Natural rubber is the alternative named on 1 other material page — Polyurethane. There is no upgrade from here.

Products we've scored involving Natural rubber

Each with its own 0–100 exposure score, evidence grade and sources.

53

Plastic teething toy

Polypropylene, TPE or silicone

Elevated

Grade D · 48%

50

Bath toys

PVC or soft vinyl, often with a squeeze hole

Elevated

Grade D · 48%

15

Glass baby bottle

Borosilicate glass with a silicone teat

Low

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 of

Sources

  1. Li 2020 (Nature Food) — Polypropylene infant bottles prepared to WHO sterilisation guidance released 1.3–16.2 million microplastic particles per litre of formula.

    Limitation: Release scaled with water temperature — the highest numbers came from the 70°C step WHO recommends for killing bacteria. The study explicitly did not recommend abandoning that step, and no health outcome was measured.

Frequently Asked Questions

Is Natural rubber a plastic?

No. Natural rubber is harvested latex from the rubber tree, not a synthetic polymer, so it is not a microplastic source. Synthetic rubber is a different material entirely and is one.

Is Natural rubber free of microplastics?

Natural rubber degrades biologically rather than fragmenting into persistent synthetic particles, which is the property that keeps it out of this problem. It has its own separate issue — latex protein allergy — which is real, is unrelated to microplastics, and is why many teats moved to silicone in the first place.

What should I use instead of Natural rubber?

Natural rubber is already one of the materials we point people toward, so there is nothing to upgrade to. Check the components around it instead — lids, seals and liners are usually where the polymer is.

How do I know if something is made of Natural rubber?

Amber or tan colour rather than clear or white. Distinct rubber smell; silicone has almost none. Softens and goes tacky with age, where silicone stays springy.

Related materials

Food-grade silicone

Technically not a plastic in the usual sense — silicone is a siloxane, built on a silicon-oxygen backbone rather than a carbon chain. It is more thermally stable than any common plastic, and it is also far less studied.

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