Ingredient review
Cyclohexyl Methacrylate/Ethylhexyl Methacrylate Copolymer
INCI: CYCLOHEXYL METHACRYLATE/ETHYLHEXYL 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 plastic-like ingredient that dries down to form a thin, flexible film on your skin or hair. It's what makes your sunscreen stay on at the beach or your mascara not smudge. Think of it like a clear, invisible raincoat — it locks in the product and keeps water out, but it doesn't moisturize or treat your skin.
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
Cyclohexyl Methacrylate/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 Cyclohexyl Methacrylate/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 from two methacrylate monomers, designed to form a durable yet flexible film when applied to skin, hair, or nails.
How it works
When the product dries, the copolymer molecules link together into a continuous film that physically blocks water and helps other ingredients stay in place. The film is flexible enough to move with your skin without cracking.
Pros
Strong water resistance
Helps sunscreens and makeup stay effective even when you sweat or swim, so you don't have to reapply as often.
Flexible film
Unlike some older film-formers, this copolymer stays flexible, so it won't crack or flake off during movement.
Cons and cautions
No skincare benefit
This ingredient only forms a film — it doesn't hydrate, soothe, or treat your skin in any way.
Can feel tight
In high concentrations, the film may leave skin feeling slightly tight or stiff, especially if you have dry skin.
Best for
- Anyone wanting long-lasting, water-resistant sunscreen or makeup
- People who swim, sweat, or live in humid climates
Use caution if
- Those with very dry or sensitive skin who prefer lightweight, breathable formulas
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risk. No known toxicity concerns from topical application.
Research notes
Safety is supported by industry reviews and regulatory approvals. No peer-reviewed studies specifically on this copolymer, but methacrylate copolymers as a class have a long history of safe use in cosmetics.
Common label clues
- Typical concentration
- 1–10% in leave-on products; up to 20% in nail or mascara formulas
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most major markets. No specific concentration restrictions for leave-on products.
- Common uses
- Sunscreens, Long-wear makeup, Waterproof mascara, Hair styling products
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is not classified as a solid microplastic and is generally considered low-risk for aquatic environments at typical usage levels.
Good to know
- This ingredient is often listed near the end of ingredient lists because it's used in small amounts.
- It is not the same as microplastics — methacrylate copolymers are typically not classified as solid plastic particles.
Common questions
What is Cyclohexyl Methacrylate/Ethylhexyl Methacrylate Copolymer in beauty products?
This is a plastic-like ingredient that dries down to form a thin, flexible film on your skin or hair. It's what makes your sunscreen stay on at the beach or your mascara not smudge. Think of it like a clear, invisible raincoat — it locks in the product and keeps water out, but it doesn't moisturize or treat your skin.
What does Cyclohexyl Methacrylate/Ethylhexyl Methacrylate Copolymer do in a beauty product?
When the product dries, the copolymer molecules link together into a continuous film that physically blocks water and helps other ingredients stay in place. The film is flexible enough to move with your skin without cracking.
Is Cyclohexyl Methacrylate/Ethylhexyl Methacrylate Copolymer safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic risk. No known toxicity concerns from topical application.
Who should be careful with Cyclohexyl Methacrylate/Ethylhexyl Methacrylate Copolymer?
Those with very dry or sensitive skin who prefer lightweight, breathable 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.