Butter London Review, Is Butter London Non-Toxic?
PFAS Authority is a scoring system, not a laboratory. We do not test products ourselves. Grades are model-based, built from published ingredients, materials, certifications, brand disclosures and third-party lab results where they exist. See the rubric.
Across 1 graded product, Butter London averages Poor (40/100). On disclosure, the brand says nothing publicly about PFAS. None of its products grade Good or better yet. Grades are model-based estimates, not lab results.
Graded and flagged Poor and Bad, we’d swap these
Butter London
Hardwear Shine UV Topcoat
UV-curable gel topcoat, formula not publicly disclosed
Uncured resin monomers (sensitization/irritation)
UV gel topcoats contain monomers that cure under light; incomplete polymerization or…
Photoinitiators and UV sensitivity
Photoinitiators used to trigger UV curing may include benzophenone derivatives or…
Fragrance allergens
Most gel topcoats contain fragrance compounds to mask solvent odor; these are common…
Volatile organic compounds (VOC) off-gassing
Uncured gel may release volatile compounds during and shortly after UV curing. The…
Medium risk. No PFAS data available, limited formula transparency.
⚠Undisclosed proprietary coating
Every grade uses the same public rubric. How grades work →