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Ingredient deep-dive

PEG-40 Hydrogenated Castor Oil: Is It a Microplastic?

Low concernPEG / glycol

Ethoxylated castor oil used to dissolve fragrance and oils into water. Plant-derived backbone, ethoxylated. Not a microplastic; the concern is 1,4-dioxane purity.

Where it appears

  • Micellar water
  • Fragrance solubiliser
  • Face mists
  • Clear gels

Regulatory status (2026)

European Union

Permitted with dioxane purity limits.

United States

No federal restriction.

Cleaner alternatives

  • Polyglyceryl-4 caprate
  • Caprylyl/capryl glucoside
  • Solubiliser-free formulas

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PEG-40 Hydrogenated Castor Oil, common questions

Is PEG-40 Hydrogenated Castor Oil a microplastic?

Borderline. Ethoxylated castor oil used to dissolve fragrance and oils into water. Plant-derived backbone, ethoxylated. Not a microplastic; the concern is 1,4-dioxane purity.

Is PEG-40 Hydrogenated Castor Oil banned?

EU: Permitted with dioxane purity limits. US: No federal restriction.

What can I use instead of PEG-40 Hydrogenated Castor Oil?

Cleaner alternatives include: Polyglyceryl-4 caprate; Caprylyl/capryl glucoside; Solubiliser-free formulas.

What products contain PEG-40 Hydrogenated Castor Oil?

Commonly found in: Micellar water; Fragrance solubiliser; Face mists; Clear gels.

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