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Ingredient deep-dive

Trimethylsiloxysilicate: Is It a Microplastic?

Medium concernSilicone

Silicone resin film-former that makes long-wear lipstick and foundation transfer-proof. A synthetic polymer that stays on skin for hours.

Where it appears

  • Long-wear and "transfer-proof" lipstick
  • 16-hour foundations
  • Waterproof concealer
  • Sweat-resistant sunscreen

Regulatory status (2026)

European Union

Silicone resins under consultation within the EU 2023/2055 framework.

United States

No federal restriction.

Cleaner alternatives

  • Beeswax and candelilla-wax films
  • Non-transfer-proof formulas

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Trimethylsiloxysilicate, common questions

Is Trimethylsiloxysilicate a microplastic?

Yes: it is classified as a synthetic polymer. Silicone resin film-former that makes long-wear lipstick and foundation transfer-proof. A synthetic polymer that stays on skin for hours.

Is Trimethylsiloxysilicate banned?

EU: Silicone resins under consultation within the EU 2023/2055 framework. US: No federal restriction.

What can I use instead of Trimethylsiloxysilicate?

Cleaner alternatives include: Beeswax and candelilla-wax films; Non-transfer-proof formulas.

What products contain Trimethylsiloxysilicate?

Commonly found in: Long-wear and "transfer-proof" lipstick; 16-hour foundations; Waterproof concealer; Sweat-resistant sunscreen.

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