Ingredient review
Polyurethane-56
INCI: Polyurethane-56
A synthetic polymer that helps makeup and skincare stay put, but offers no active skin benefit.
In plain English
Polyurethane-56 is a man-made ingredient that forms a thin, flexible film on your skin or hair. Think of it like a clear, breathable plastic wrap that helps makeup last longer without smudging or fading. It's not absorbed into the skin and doesn't provide moisture or active benefits—it's purely a performance enhancer for texture and wear.
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-56 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-56.
- 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-56 is a synthetic polymer belonging to the polyurethane family. It is created through a chemical reaction between diisocyanates and polyols, resulting in a flexible, durable film-forming material. In cosmetics, it is used as a film former and viscosity modifier.
How it works
When applied, Polyurethane-56 forms a continuous, flexible film on the skin or hair surface. This film helps lock in other ingredients, resist water and sweat, and improve the spreadability and feel of the product. It also helps suspend pigments evenly in foundations and mascaras.
Pros
Boosts wear time
Helps makeup and sunscreen stay put for hours, reducing the need for touch-ups.
Flexible finish
Unlike some stiff polymers, Polyurethane-56 creates a film that moves with your skin, minimizing cracking or flaking.
Cons and cautions
No skin benefit
It doesn't hydrate, soothe, or repair skin—it's purely a cosmetic texture enhancer.
Potential heaviness
On oily skin, the film can feel tacky or contribute to a greasy appearance over time.
Best for
- Anyone wanting long-lasting makeup or waterproof products
- People with normal to dry skin who prefer a dewy, locked-in finish
Use caution if
- Those with very oily or acne-prone skin may find film-formers too occlusive
Usage tips
Safety summary
Polyurethane-56 is considered safe for cosmetic use at typical concentrations. It is not absorbed through the skin and has low irritation and comedogenic potential. However, individuals with sensitive skin should patch-test new products containing film-formers.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have found polyurethane polymers to be safe in cosmetics. Most data comes from industry studies; independent long-term environmental research is limited.
Common label clues
- Typical concentration
- 0.5% to 5% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most major markets. No specific concentration restrictions, but formulators follow good manufacturing practices.
- Common uses
- Long-wear foundations, Waterproof mascaras, Sunscreens, Hair styling products
- Environmental note
- As a synthetic polymer, Polyurethane-56 is not biodegradable. Its environmental impact is less studied than microplastics, but it may accumulate in water systems.
Good to know
- Polyurethane-56 is often used in 'transfer-proof' lipsticks and long-wear foundations.
- It is not considered a microplastic, but its environmental persistence is still under study.
Common questions
What is Polyurethane-56 in beauty products?
Polyurethane-56 is a man-made ingredient that forms a thin, flexible film on your skin or hair. Think of it like a clear, breathable plastic wrap that helps makeup last longer without smudging or fading. It's not absorbed into the skin and doesn't provide moisture or active benefits—it's purely a performance enhancer for texture and wear.
What does Polyurethane-56 do in a beauty product?
When applied, Polyurethane-56 forms a continuous, flexible film on the skin or hair surface. This film helps lock in other ingredients, resist water and sweat, and improve the spreadability and feel of the product. It also helps suspend pigments evenly in foundations and mascaras.
Is Polyurethane-56 safe for most people?
Polyurethane-56 is considered safe for cosmetic use at typical concentrations. It is not absorbed through the skin and has low irritation and comedogenic potential. However, individuals with sensitive skin should patch-test new products containing film-formers.
Who should be careful with Polyurethane-56?
Those with very oily or acne-prone skin may find film-formers too occlusive
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.