Motorcycle and Bicycle Helmet Materials (BPA in Polycarbonate Shell, Isocyanate Off-Gassing from EPS/Polyurethane Liner Foam) — safety profile
Low riskMotorcycle and bicycle helmets consist of a rigid outer shell (typically polycarbonate, ABS, or fiberglass composite) bonded to an energy-absorbing expanded polystyrene (EPS) or polyurethane foam liner, with comfort padding in direct skin contact.
What is this product?
Motorcycle and bicycle helmets consist of a rigid outer shell (typically polycarbonate, ABS, or fiberglass composite) bonded to an energy-absorbing expanded polystyrene (EPS) or polyurethane foam liner, with comfort padding in direct skin contact. Polycarbonate shells are manufactured from bisphenol A (BPA) — an endocrine disruptor that can leach from the polymer matrix under UV exposure, heat, and mechanical stress. Studies by Vandenberg et al. (2007) demonstrated BPA migration from polycarbonate at accelerated rates above 40 degrees Celsius — relevant as helmet shell temperatures routinely exceed 50-60 degrees Celsius in direct sunlight. The EPS and polyurethane foam liners off-gas residual volatile organic compounds including styrene monomer (from EPS), toluene diisocyanate (TDI), and methylene diphenyl diisocyanate (MDI) from polyurethane foam — both classified as respiratory sensitizers (IARC Group 2B for TDI). Direct scalp contact with comfort padding saturated by sweat creates a dermal absorption pathway for plasticizers and flame retardant additives in foam. Helmet replacement intervals (3-5 years) reflect material degradation that also increases chemical migration rates over time.
What's in it
Click any compound name for its full safety profile, regulatory consensus, and exposure data.
Structural Monomer
Frequently asked questions
No FAQs generated.
Look up Motorcycle and Bicycle Helmet Materials (BPA in Polycarbonate Shell, Isocyanate Off-Gassing from EPS/Polyurethane Liner Foam) in the body app
Search by ingredient, browse by category, or compare to alternatives in the live app.
Open in body View raw API dataReference data, not professional advice. Aggregates publicly available regulatory and scientific information. Why we built ALETHEIA →