Ingredient review
Polyurethane
INCI: Polyurethane
Polyurethane is a synthetic film-former that helps makeup and sunscreen stay put longer without feeling heavy or sticky.
In plain English
Polyurethane is a type of plastic-like material used in cosmetics to create a thin, flexible, and water-resistant film on your skin or hair. Think of it like a clear, invisible shield that helps makeup last longer, keeps sunscreen from washing off, or holds a hairstyle in place. It's different from older film-formers because it doesn't feel tight or stiff—it moves with your skin.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is useful, but some claims depend heavily on the formula.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Polyurethane is generally a lower-concern ingredient when the full formula suits your skin.
Plain-English read
Treat this as a practical screening step before you compare products that contain this ingredient.
- Step 1Start with the score, then check the irritation and clogging risk before judging Polyurethane.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.
Score terms in plain English
Irritation risk
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
Polyurethane is a synthetic polymer made by reacting diisocyanates with polyols. In cosmetics, it's used as a film-forming agent that dries down to a flexible, durable layer. It's often modified to be water-dispersible, making it easier to formulate into creams, lotions, and sprays.
How it works
When applied, polyurethane particles in the formula coalesce (fuse together) as the water or solvent evaporates, forming a continuous, flexible film. This film adheres to the skin or hair, providing water resistance, smudge resistance, and a smooth finish. It also helps other ingredients like pigments or UV filters stay evenly distributed and in place.
Pros
Flexible film
Unlike older film-formers that can feel stiff or tight, polyurethane creates a flexible layer that moves naturally with your skin, making it comfortable for all-day wear.
Water resistance
It provides reliable water and sweat resistance, which is especially valuable in sunscreens and long-wear foundations, helping them stay effective longer.
Cons and cautions
Synthetic origin
Polyurethane is a synthetic plastic-derived material, which may be a concern for those seeking natural or biodegradable beauty products.
Removal difficulty
Because it forms a durable film, polyurethane-based products often require an oil-based cleanser or double cleansing to remove completely, which can be inconvenient.
Best for
- Anyone wanting long-wearing, water-resistant makeup or sunscreen
- People with oily skin who need products that stay put
Use caution if
- Those who prefer exclusively natural or biodegradable ingredients
Usage tips
Safety summary
Polyurethane is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, as a synthetic polymer, it may not be suitable for those seeking natural or biodegradable products.
Research notes
Research on polyurethane in cosmetics focuses on its film-forming properties and safety. The CIR panel has reviewed it and found no significant safety concerns. Studies show it is well-tolerated on skin and does not penetrate the skin barrier.
Common label clues
- Typical concentration
- 1–10% in leave-on products; varies by formulation
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The Cosmetic Ingredient Review (CIR) panel has reviewed polyurethane and related polymers and found them safe as used.
- Common uses
- Long-wear foundations, Waterproof mascaras, Sunscreens, Hair styling products, Lip products
- Environmental note
- Polyurethane is a synthetic plastic and not biodegradable. Its environmental impact depends on the specific formulation and disposal methods.
Good to know
- Polyurethane is often listed with a number (e.g., Polyurethane-1, Polyurethane-14) indicating its specific chemical structure.
- It is considered safe by major regulatory bodies when used in cosmetics at typical concentrations.
Common questions
What is Polyurethane in beauty products?
Polyurethane is a type of plastic-like material used in cosmetics to create a thin, flexible, and water-resistant film on your skin or hair. Think of it like a clear, invisible shield that helps makeup last longer, keeps sunscreen from washing off, or holds a hairstyle in place. It's different from older film-formers because it doesn't feel tight or stiff—it moves with your skin.
What does Polyurethane do in a beauty product?
When applied, polyurethane particles in the formula coalesce (fuse together) as the water or solvent evaporates, forming a continuous, flexible film. This film adheres to the skin or hair, providing water resistance, smudge resistance, and a smooth finish. It also helps other ingredients like pigments or UV filters stay evenly distributed and in place.
Is Polyurethane safe for most people?
Polyurethane is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, as a synthetic polymer, it may not be suitable for those seeking natural or biodegradable products.
Who should be careful with Polyurethane?
Those who prefer exclusively natural or biodegradable ingredients
Research sources
Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.