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POLYETHYLENE ISOTEREPHTHALATE

CAS -
42

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

A rigid polymer often used in cosmetic microbeads and glitter formulations, where it serves as a film-forming or bulking agent.

Polyethylene Isoterephthalate is a synthetic polymer that, in cosmetic contexts, functions as a bulking agent and microplastic particle. The EU's REACH regulation has restricted microplastics in cosmetic products due to environmental persistence and bioaccumulation concerns, and the substance is monitored under the Union's priority list for marine litter. While oral and dermal toxicity are low, environmental risk is the dominant regulatory concern.

Skin benefits

  • Provides smooth texture in cosmetic formulations
  • Used as bulking agent in color cosmetics

Known concerns

  • Environmental persistence and bioaccumulation (EU REACH microplastics restriction)
  • Contributing to marine microplastic pollution
  • Not biodegradable

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.