Film Former
BIS-HEA POLY(1,4-BUTANEDIOL)-9/TDI COPOLYMER
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A nail polyurethane built on toluene diisocyanate (TDI). The fully cured polymer is essentially inert and used in many nail systems, but TDI monomer itself is a known potent sensitizer, so residual-monomer purity is critical.
Function
Skin benefits
- Forms tough, flexible films on nails
- Improves adhesion and chip resistance
- Adds durability to nail polish systems
Known concerns
- TDI (toluene diisocyanate) is a known potent respiratory and skin sensitizer in monomer form
- Cured polymer is inert but residual TDI is a serious purity flag
- Limited transparency on polymer purity standards
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related film formers
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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.