Ingredient review

Polyurethane Crosspolymer-1

INCI: Polyurethane Crosspolymer-1

A gentle synthetic polymer that gives a smooth, flexible finish to makeup and skincare without clogging pores.

beautyskincarehaircare

In plain English

Polyurethane Crosspolymer-1 is a man-made ingredient that forms a thin, flexible film on your skin or hair. Think of it like a breathable, invisible glove that helps makeup stay put longer, makes skin feel silky, or gives hair hold without stiffness. It's commonly found in primers, long-wear foundations, and sunscreens to improve texture and durability.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Polyurethane Crosspolymer-1 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Polyurethane Crosspolymer-1.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic crosslinked polymer made from polyurethane, designed to create a flexible, water-resistant film on the skin or hair surface.

How it works

When applied, the polymer molecules link together to form a continuous, elastic film. This film smooths out uneven texture, helps other ingredients (like pigments or UV filters) adhere evenly, and resists smudging or fading from sweat and humidity.

Pros

Long-lasting wear

Helps makeup and sunscreen stay put for hours without smudging or fading, even in humid conditions.

Smooth texture

Creates a silky, even surface that minimizes the look of pores and fine lines, making it ideal for primers.

Cons and cautions

Removal can be tricky

The flexible film may require an oil-based cleanser or double cleansing to fully remove, which can be inconvenient.

Potential tightness on dry skin

On very dry or dehydrated skin, the film may feel slightly tight or uncomfortable, especially if layered heavily.

Best for

  • People who want long-lasting makeup or sunscreen
  • Those with oily or combination skin looking for a smooth, matte finish

Use caution if

  • Individuals with very dry or dehydrated skin who prefer lightweight, non-film-forming products

Usage tips

Apply to damp skin for a more even, less heavy film.
Use an oil-based cleanser or micellar water to remove products containing this polymer thoroughly.
Layer lightweight moisturizer underneath to prevent any tightness.

Safety summary

Polyurethane Crosspolymer-1 is widely considered safe for cosmetic use. It has low irritation and comedogenic potential, and no significant safety concerns have been raised by regulatory bodies.

Research notes

Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that polyurethane polymers are safe when formulated to be non-irritating. Most evidence comes from industry safety data rather than independent clinical trials.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the US, EU, and many other regions. No known restrictions at typical concentrations.
Common uses
Primers, Sunscreens, Long-wear foundations, Hair styling products
Environmental note
As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate.

Good to know

  • Polyurethane Crosspolymer-1 is considered non-comedogenic and safe for most skin types.
  • It is often used in 'transfer-proof' lipsticks and long-wear foundations.

Common questions

What is Polyurethane Crosspolymer-1 in beauty products?

Polyurethane Crosspolymer-1 is a man-made ingredient that forms a thin, flexible film on your skin or hair. Think of it like a breathable, invisible glove that helps makeup stay put longer, makes skin feel silky, or gives hair hold without stiffness. It's commonly found in primers, long-wear foundations, and sunscreens to improve texture and durability.

What does Polyurethane Crosspolymer-1 do in a beauty product?

When applied, the polymer molecules link together to form a continuous, elastic film. This film smooths out uneven texture, helps other ingredients (like pigments or UV filters) adhere evenly, and resists smudging or fading from sweat and humidity.

Is Polyurethane Crosspolymer-1 safe for most people?

Polyurethane Crosspolymer-1 is widely considered safe for cosmetic use. It has low irritation and comedogenic potential, and no significant safety concerns have been raised by regulatory bodies.

Who should be careful with Polyurethane Crosspolymer-1?

Individuals with very dry or dehydrated skin who prefer lightweight, non-film-forming products

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Polyurethane PolymersOpenPubChem - Polyurethane Crosspolymer-1OpenEuropean Chemicals Agency (ECHA) - PolyurethaneOpen

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.