Ingredient review
Butyl Acrylate/Cyclohexyl Methacrylate Copolymer
INCI: Butyl Acrylate/Cyclohexyl Methacrylate Copolymer
A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.
In plain English
This is a synthetic polymer that dries down to form a thin, flexible film on your skin or hair. Think of it like an invisible, breathable shield that helps makeup last longer or sunscreen stay effective even when you sweat. It doesn't moisturize or treat your skin—it's purely a performance ingredient.
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/Cyclohexyl Methacrylate Copolymer 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/Cyclohexyl Methacrylate Copolymer.
- 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 synthetic copolymer created by polymerizing butyl acrylate and cyclohexyl methacrylate monomers. It is designed to form a uniform, flexible film when applied to the skin or hair.
How it works
When the product is applied, the solvent (usually water or alcohol) evaporates, leaving behind a continuous polymer film. This film adheres to the surface, providing water resistance, improving wear time, and helping other ingredients (like UV filters or pigments) stay in place.
Pros
Boosts water resistance
Helps sunscreen and makeup stay effective even when you sweat or get wet, so you don't have to reapply as often.
Lightweight feel
The film is flexible and thin, so it doesn't feel heavy or cakey on the skin compared to some older film-formers.
Cons and cautions
No active benefit
This ingredient is purely functional—it doesn't hydrate, soothe, or treat skin, so it adds no real skincare value.
Potential tightness
On very dry or sensitive skin, the film can create a slight tightening sensation, which some people find uncomfortable.
Best for
- Anyone wanting long-wear or water-resistant makeup
- People who need sweat-resistant sunscreen for outdoor activities
Use caution if
- Those with very dry or compromised skin barriers who prefer purely nourishing formulas
Usage tips
Safety summary
Generally recognized as safe for topical cosmetic use. Low irritation and comedogenic potential. No significant safety concerns have been raised in regulatory reviews.
Research notes
Evidence is based on industry safety assessments and regulatory reviews rather than independent clinical studies. The CIR panel has reviewed related acrylate copolymers and concluded they are safe for use in cosmetics.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated similar acrylate copolymers and found them safe at typical use levels.
- Common uses
- Sunscreens, Long-wear makeup, Water-resistant formulas
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate significantly.
Good to know
- This polymer is often used in combination with other film-formers to fine-tune flexibility and water resistance.
- It is considered safe for use in cosmetics by major regulatory bodies when used as intended.
Common questions
What is Butyl Acrylate/Cyclohexyl Methacrylate Copolymer in beauty products?
This is a synthetic polymer that dries down to form a thin, flexible film on your skin or hair. Think of it like an invisible, breathable shield that helps makeup last longer or sunscreen stay effective even when you sweat. It doesn't moisturize or treat your skin—it's purely a performance ingredient.
What does Butyl Acrylate/Cyclohexyl Methacrylate Copolymer do in a beauty product?
When the product is applied, the solvent (usually water or alcohol) evaporates, leaving behind a continuous polymer film. This film adheres to the surface, providing water resistance, improving wear time, and helping other ingredients (like UV filters or pigments) stay in place.
Is Butyl Acrylate/Cyclohexyl Methacrylate Copolymer safe for most people?
Generally recognized as safe for topical cosmetic use. Low irritation and comedogenic potential. No significant safety concerns have been raised in regulatory reviews.
Who should be careful with Butyl Acrylate/Cyclohexyl Methacrylate Copolymer?
Those with very dry or compromised skin barriers who prefer purely nourishing formulas
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.