Ingredient review
Polyurethane-63
INCI: Polyurethane-63
A synthetic film-former that helps makeup and skincare last longer without clogging pores.
In plain English
Polyurethane-63 is a man-made polymer that creates a flexible, invisible film on your skin. This film helps makeup stay put longer, resists sweat and water, and can make products feel smoother. It's like a gentle, breathable glue for your cosmetics, but it doesn't block pores or cause irritation for most people.
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-63 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-63.
- 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-63 is a synthetic polymer from the polyurethane family, specifically designed for cosmetic use. It is a film-forming agent that dries down to a flexible, water-resistant layer on the skin or hair.
How it works
When applied, the polymer chains spread out and then link together as the solvent (water or alcohol) evaporates, forming a continuous, flexible film. This film physically holds pigments and other ingredients in place, improving wear time and water resistance without feeling heavy or stiff.
Pros
Boosts wear time
Creates a flexible film that helps makeup resist sweat, water, and rubbing, so your look lasts longer without touch-ups.
Non-comedogenic
Unlike some heavy waxes or oils, Polyurethane-63 does not clog pores, making it suitable for acne-prone skin.
Cons and cautions
Synthetic origin
It is a man-made polymer, which may not appeal to those seeking fully natural or organic beauty products.
Potential tightness
On very dry or sensitive skin, the film can sometimes feel slightly tight or drying, especially if layered under matte foundations.
Best for
- Anyone wanting long-wearing makeup or water-resistant sunscreens
- People with normal to oily skin who struggle with makeup fading
Use caution if
- Those with extremely dry or compromised skin barriers who prefer only natural ingredients
- Individuals with known sensitivity to polyurethane compounds (rare)
Usage tips
Safety summary
Polyurethane-63 is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, and no known systemic toxicity from topical use. It is not a known endocrine disruptor.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel and EU SCCS have found polyurethane polymers to be safe in cosmetics. Most data come from industry-sponsored studies and regulatory reviews, with limited independent peer-reviewed research on this specific variant.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the EU CosIng database and the US FDA (as a cosmetic ingredient). No concentration restrictions are typically imposed.
- Common uses
- Foundations, Mascaras, Eyeliners, Long-wear lip products, Sunscreens
- Environmental note
- Polyurethane-63 is a synthetic polymer; its environmental fate depends on formulation and disposal. Some studies suggest it may biodegrade slowly, but it is not classified as a microplastic in all jurisdictions.
Good to know
- Polyurethane-63 is often used in 'clean' beauty brands as a safer alternative to older film-formers like formaldehyde-releasing preservatives.
- It is considered biodegradable under certain conditions, though environmental impact varies by formulation.
Common questions
What is Polyurethane-63 in beauty products?
Polyurethane-63 is a man-made polymer that creates a flexible, invisible film on your skin. This film helps makeup stay put longer, resists sweat and water, and can make products feel smoother. It's like a gentle, breathable glue for your cosmetics, but it doesn't block pores or cause irritation for most people.
What does Polyurethane-63 do in a beauty product?
When applied, the polymer chains spread out and then link together as the solvent (water or alcohol) evaporates, forming a continuous, flexible film. This film physically holds pigments and other ingredients in place, improving wear time and water resistance without feeling heavy or stiff.
Is Polyurethane-63 safe for most people?
Polyurethane-63 is considered safe for use in cosmetics at typical concentrations. It has low irritation and sensitization potential, and no known systemic toxicity from topical use. It is not a known endocrine disruptor.
Who should be careful with Polyurethane-63?
Those with extremely dry or compromised skin barriers who prefer only natural ingredients Individuals with known sensitivity to polyurethane compounds (rare)
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.