Ingredient review
Butyl Acrylate/Ethylhexyl Methacrylate Copolymer
INCI: BUTYL ACRYLATE/ETHYLHEXYL METHACRYLATE COPOLYMER
A safe, effective film-former that helps makeup and sunscreen stay put, but may feel heavy on very oily skin.
In plain English
This is a plastic-like ingredient that dries down to a thin, flexible film on your skin or hair. It helps products resist water, sweat, and smudging, so your makeup lasts longer and your sunscreen stays effective. Think of it as a clear, invisible shield that bends and moves with you.
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/Ethylhexyl 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/Ethylhexyl 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 made by combining butyl acrylate and ethylhexyl methacrylate monomers. It is designed to form a continuous, flexible film when applied to skin or hair, improving the durability and water resistance of cosmetic products.
How it works
When the product is applied, the copolymer's solvent evaporates, leaving behind a thin, even film. This film physically blocks water and oil from disturbing the underlying product (like pigment or sunscreen actives), while remaining flexible enough to not crack or feel stiff.
Pros
Excellent water resistance
Creates a durable barrier that keeps makeup and sunscreen intact during swimming, sweating, or humid conditions.
Flexible and comfortable
Unlike some older film-formers, this copolymer stays pliable, so it doesn't feel stiff or tight on the skin.
Cons and cautions
May feel heavy on oily skin
The film can add a slight weight or tackiness that some with very oily skin find uncomfortable.
Requires double cleansing
Because it's water-resistant, you'll likely need an oil-based cleanser or micellar water to remove it fully.
Best for
- Anyone wanting long-wearing makeup or water-resistant sunscreen
- People with normal to dry skin who appreciate extra staying power
Use caution if
- Those who prefer lightweight, minimal-feel formulas and are willing to reapply
Usage tips
Safety summary
Butyl Acrylate/Ethylhexyl Methacrylate Copolymer is considered safe for cosmetic use. It has low irritation and comedogenic potential, and no significant health concerns have been identified at typical use levels.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel and other bodies have concluded that acrylate copolymers are safe in cosmetics. Most evidence comes from industry safety data and regulatory reviews rather than independent clinical studies.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no concentration restrictions.
- Common uses
- Sunscreens, Long-wear foundations, Waterproof mascaras, Hair styling products
- Environmental note
- As a synthetic polymer, it is not biodegradable and may contribute to microplastic pollution. Some brands are moving toward biodegradable alternatives.
Good to know
- This ingredient is common in 'transfer-proof' and '24-hour wear' makeup formulas.
- It is considered safe by major regulatory bodies when used as directed.
Common questions
What is Butyl Acrylate/Ethylhexyl Methacrylate Copolymer in beauty products?
This is a plastic-like ingredient that dries down to a thin, flexible film on your skin or hair. It helps products resist water, sweat, and smudging, so your makeup lasts longer and your sunscreen stays effective. Think of it as a clear, invisible shield that bends and moves with you.
What does Butyl Acrylate/Ethylhexyl Methacrylate Copolymer do in a beauty product?
When the product is applied, the copolymer's solvent evaporates, leaving behind a thin, even film. This film physically blocks water and oil from disturbing the underlying product (like pigment or sunscreen actives), while remaining flexible enough to not crack or feel stiff.
Is Butyl Acrylate/Ethylhexyl Methacrylate Copolymer safe for most people?
Butyl Acrylate/Ethylhexyl Methacrylate Copolymer is considered safe for cosmetic use. It has low irritation and comedogenic potential, and no significant health concerns have been identified at typical use levels.
Who should be careful with Butyl Acrylate/Ethylhexyl Methacrylate Copolymer?
Those who prefer lightweight, minimal-feel formulas and are willing to reapply
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.