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Cosmetic ingredient dictionary

Polyurethane-33 in cosmetics: what it is and what it does

Polyurethane-33 is a cosmetic ingredient that holds a powder or a pressed product together. Open Beauty Facts finds it in 8 products, most often nail makeup.

By Bravoora teamUpdated Sources checked 2 sourcesHow we check

What does Polyurethane-33 do in a product?

In a cosmetic product, Polyurethane-33 holds a powder or a pressed product together. The EU’s CosIng database lists this job for it: binding.

binding

What is Polyurethane-33?

Polyurethane-33 is a complex polymer formed by reacting dimethylolpropionic acid and a polyester composed of Adipic Acid, Hexylene Glycol, Neopentyl Glycol with methylene dicyclohexyldiisocyanate (SMDI) to form a prepolymer. The prepolymer is neutralized with triethylamine and then chain-extended with hydrazine.

CosIng reference
85977

Which products contain Polyurethane-33?

Open Beauty Facts finds Polyurethane-33 in the ingredient lists of 8 of the 22,021 products it has a list for, most often nail makeup and nail polishes.

  • Nail makeup1
  • Nail polishes1

Products with it, by country of sale: Australia 6 · Germany 6 · France 2.

Counted on 13 October 2026 from Open Beauty Facts, which volunteers fill from real packs: it shows where Polyurethane-33 turns up, not how much of the market it is.

Bravoora reads this ingredient for everyone you shop for: an allergy or intolerance, a vegan or vegetarian diet, a calorie or protein goal, and the labels on supplements and skincare too. Build a profile · For dermatologists, dietitians and doctors

Sources

The job, the description and the EU annex entry are CosIng’s; the fragrance allergens are the EU Annex III names Bravoora’s label checker reads; the product counts are Open Beauty Facts’.

  1. European Commission: CosIng cosmetic ingredient database (functions, description, EU annex entry)
  2. Open Beauty Facts: product database, 77,506 products, read 13 October 2026, ODbL

Contains information from Open Beauty Facts, which is made available here under the Open Database License (ODbL). Read the licence · Download this dictionary’s data · How we check

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