Ingredient review
Polyethylhexyl Methacrylate
INCI: Polyethylhexyl Methacrylate
A synthetic film-former that helps makeup last longer and resist water, but may feel heavy on very sensitive skin.
In plain English
Polyethylhexyl Methacrylate is a plastic-like polymer that creates a thin, flexible film on your skin or lashes. This film helps makeup stay put longer, resist sweat and water, and gives a smooth, even finish. Think of it as a clear, invisible shield that locks your makeup in place without being 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
Polyethylhexyl Methacrylate 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 Polyethylhexyl Methacrylate.
- 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 polymer made from methacrylate monomers, engineered to form a flexible, water-resistant film on the skin or hair.
How it works
When applied, the polymer chains spread into a continuous, breathable film that physically blocks water and oil from breaking down the product underneath. It also thickens the formula, giving it a richer, more luxurious feel.
Pros
Long-lasting wear
Creates a durable film that helps makeup resist fading, smudging, and transferring throughout the day.
Water and sweat resistant
Forms a protective barrier that keeps products intact even in humid conditions or during light activity.
Cons and cautions
Can feel heavy
On dry or sensitive skin, the film may feel tight or uncomfortable, especially in layered products.
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
- People who need long-wearing, waterproof makeup
- Those with normal to oily skin looking for a smooth finish
Use caution if
- Individuals with very dry or easily irritated skin who prefer lightweight, breathable formulas
Usage tips
Safety summary
Polyethylhexyl Methacrylate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with very sensitive skin may experience tightness or discomfort.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that polyethylhexyl methacrylate is safe as used in cosmetics. Studies show minimal skin penetration and low acute toxicity.
Common label clues
- Typical concentration
- 0.5% to 10%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. No known restrictions at typical concentrations.
- Common uses
- Long-wear foundations, Waterproof mascaras, Sunscreens, Lip products
- Environmental note
- As a synthetic polymer, it is not biodegradable and may contribute to microplastic pollution. Some brands are moving toward bio-based alternatives.
Good to know
- Polyethylhexyl Methacrylate is often listed near the end of ingredient lists because it's used in small amounts.
- It is not the same as methacrylate monomers used in nail products — it's a polymer and considered safe for skin.
Common questions
What is Polyethylhexyl Methacrylate in beauty products?
Polyethylhexyl Methacrylate is a plastic-like polymer that creates a thin, flexible film on your skin or lashes. This film helps makeup stay put longer, resist sweat and water, and gives a smooth, even finish. Think of it as a clear, invisible shield that locks your makeup in place without being sticky.
What does Polyethylhexyl Methacrylate do in a beauty product?
When applied, the polymer chains spread into a continuous, breathable film that physically blocks water and oil from breaking down the product underneath. It also thickens the formula, giving it a richer, more luxurious feel.
Is Polyethylhexyl Methacrylate safe for most people?
Polyethylhexyl Methacrylate is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with very sensitive skin may experience tightness or discomfort.
Who should be careful with Polyethylhexyl Methacrylate?
Individuals with very dry or easily irritated 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.