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TEREPHTHALIC ACID

CAS 100-21-0 Updated
60

Safety score · 0–100

Fine

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

About

An aromatic dicarboxylic acid best known as the building block of PET plastic. In cosmetics it appears as a polyester monomer; the free acid itself is mostly a manufacturing intermediate with mild dust-irritation flags.

Function

NOT REPORTED

Skin benefits

  • Polymer monomer
  • Stable when polymerised

Known concerns

  • Mild powder/dust irritation
  • Sparse cosmetic data on free acid
  • Microplastic considerations for derived polymers

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.