Ingredient review
Butyl Acrylate Crosspolymer
INCI: BUTYL ACRYLATE/ISOPROPYLACRYLAMIDE/PEG-18 DIMETHACRYLATE CROSSPOLYMER
A synthetic polymer that forms a flexible, breathable film on skin, improving water resistance and texture without clogging pores.
In plain English
This is a man-made ingredient that creates a thin, invisible film on your skin. It helps other ingredients stay put longer, especially in sunscreens and long-wear makeup. Think of it like a gentle, flexible glue that holds the product together and helps it resist water and sweat without feeling heavy or sticky.
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
Butyl Acrylate Crosspolymer 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 Butyl Acrylate Crosspolymer.
- 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
A high-molecular-weight synthetic polymer made from acrylic monomers. It is a crosspolymer, meaning its long chains are linked together to form a network that provides structure and film-forming ability.
How it works
When applied, the polymer dries to form a continuous, flexible film on the skin. This film helps lock in other ingredients, improves water resistance, and gives a smooth, even finish. It also thickens the product, making it easier to spread and more luxurious in feel.
Pros
Enhances wear time
Forms a flexible film that helps makeup and sunscreen stay put for hours, even in humid or sweaty conditions.
Lightweight texture
Unlike older film-formers, this polymer dries down without a heavy or sticky feel, making it comfortable for daily wear.
Cons and cautions
Potential tightness
On very dry or dehydrated skin, the film can create a slight tightening sensation, which some may find uncomfortable.
Synthetic origin
As a fully synthetic ingredient, it may not be preferred by those seeking natural or minimal-ingredient routines.
Best for
- Anyone looking for long-wear makeup or water-resistant sunscreen
- People with oily or combination skin who prefer a matte finish
Use caution if
- Those with very dry or compromised skin barriers who may find film-formers uncomfortable
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory reviews.
Research notes
Limited independent research on this specific polymer, but the broader class of acrylate crosspolymers has been reviewed by the Cosmetic Ingredient Review (CIR) panel and found safe for use in cosmetics. Most evidence comes from formulation studies rather than clinical trials.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (USA) and the European Commission. No known restrictions at typical use levels.
- Common uses
- Sunscreens, Primers, Long-wear foundations, Water-resistant moisturizers
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in low concentrations and is not considered a major environmental concern compared to microplastics.
Good to know
- This polymer is often used in combination with silicones to create a silky, smooth application.
- It is considered non-comedogenic and safe for most skin types.
Common questions
What is Butyl Acrylate Crosspolymer in beauty products?
This is a man-made ingredient that creates a thin, invisible film on your skin. It helps other ingredients stay put longer, especially in sunscreens and long-wear makeup. Think of it like a gentle, flexible glue that holds the product together and helps it resist water and sweat without feeling heavy or sticky.
What does Butyl Acrylate Crosspolymer do in a beauty product?
When applied, the polymer dries to form a continuous, flexible film on the skin. This film helps lock in other ingredients, improves water resistance, and gives a smooth, even finish. It also thickens the product, making it easier to spread and more luxurious in feel.
Is Butyl Acrylate Crosspolymer safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory reviews.
Who should be careful with Butyl Acrylate Crosspolymer?
Those with very dry or compromised skin barriers who may find film-formers uncomfortable
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.