Ingredient deep-dive

Cetearyl Methicone: Is It a Microplastic?

Sources reviewedSilicone

Cetearyl Methicone is a silicone polymer with carbon-containing substituents. Its silicon–oxygen backbone does not automatically exclude it from the EU definition; actual polymer, solid and particle criteria matter.

Shared method updated October 6, 2026. Individual sources reviewed October 6, 2026.

What changed in this reference

Earlier pages inferred a yes/no microplastic verdict from an editorial high/medium/low grouping. Those labels were not measurements or health-risk grades. The shared answer, FAQ and regulation context now distinguish label names from physical particles. This entry also received the individual source review described below.

Cetearyl Methicone is an alkyl-substituted siloxane polymer. The final CIR definition lists occlusive skin conditioning. The ingredient name does not provide a melting point or a finished-product particle measurement.

Identity corrections and evidence limits

The earlier universal wax-like description and suggested wax replacements are withdrawn. Physical-property data for another alkyl silicone, such as C30-45 Alkyl Dimethicone, cannot be assigned to this identity or to every Cetearyl Methicone formula.

The April 2022 CIR final report covers the described cosmetic uses and concentrations with non-irritating formulation. It found insufficient data for incidental inhalation from airbrush application. Its published and industry-submitted evidence is not a test of your product, environmental impact or current legal compliance.

Reported uses and functions

Occlusive skin conditioning

How the rules depend on the product

European Union

The EU restriction depends on polymer and particle criteria, exclusions and use. Abrasive microbeads have no transition after 17 October 2023. Otherwise, covered rinse-off cosmetics generally transition on 17 October 2027, other leave-on cosmetics on 17 October 2029, and make-up, lip and nail products on 17 October 2035. Microbeads, fragrance encapsulation and rinse-off uses have specific exceptions to those groupings. A name alone cannot establish compliance.

United States

The federal Microbead-Free Waters Act targets intentionally added solid plastic microbeads in rinse-off cosmetics for exfoliating or cleansing. It is not a blanket ban on all polymers or a product safety assessment. Other applicable rules require separate checking.

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Cetearyl Methicone, common questions

Is Cetearyl Methicone a microplastic?

Does a label match mean Cetearyl Methicone is banned?

A label match alone cannot determine product compliance. EU context: The EU restriction depends on polymer and particle criteria, exclusions and use. Abrasive microbeads have no transition after 17 October 2023. Otherwise, covered rinse-off cosmetics generally transition on 17 October 2027, other leave-on cosmetics on 17 October 2029, and make-up, lip and nail products on 17 October 2035. Microbeads, fragrance encapsulation and rinse-off uses have specific exceptions to those groupings. A name alone cannot establish compliance. US context: The federal Microbead-Free Waters Act targets intentionally added solid plastic microbeads in rinse-off cosmetics for exfoliating or cleansing. It is not a blanket ban on all polymers or a product safety assessment. Other applicable rules require separate checking. Other substance-specific rules are separate from the microplastic definition; this reference is not a compliance determination.

Can a label show the particle count or health effect?

A label-name match does not measure particles, concentration, exposure or health effects. Polymer identity alone does not establish particle form or legal scope.

Sources and review scope

The Commission guide establishes the shared definition and transition context; CosIng inclusion is not ingredient approval. Label rules do not provide a particle assay. Ingredient-specific sources support the identity and scope stated here, not a tested product or measured health outcome.