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BIS-(T-BUTYL BENZOXAZOLYL) THIOPHENE

CAS 7128-64-5
47

Safety score · 0–100

Moderate

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

About

An optical brightener and fluorescent whitening agent used in cosmetics and textiles that is classified as potentially hazardous to aquatic life (H413) and faces increasing regulatory scrutiny in the EU.

Bis-(t-Butyl Benzoxazolyl) Thiophene (also known as 2,5-bis(2-benzoxazolyl)thiophene or BBOT) is a fluorescent whitening agent (FWA) belonging to the benzoxazole class. It absorbs UV-A radiation and re-emits in the visible blue range, producing a brightening effect. The compound carries an H413 hazard statement (may cause long-lasting harmful effects to aquatic life) under CLP. EU REACH requires registration for substances manufactured or imported above 1 tonne/year, and substances with H413 classification face potential restriction under the Urban Waste Water Treatment Directive and REACH authorisation processes for PBT-like substances.

Skin benefits

  • Fluorescent whitening/brightening effect in cosmetic formulations

Known concerns

  • Aquatic toxicity concern (H413 — may cause long-lasting harmful effects to aquatic life)
  • PBT-like (persistent, bioaccumulative, toxic) profile suspected
  • Benzoxazole heterocycle — structural alerts for genotoxicity in related compounds
  • Increasing EU regulatory scrutiny under REACH and Water Framework Directive

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.