Ingredient review
Polyacrylate-40
INCI: Polyacrylate-40
Polyacrylate-40 is a synthetic film-former that helps products stay put, resist water, and feel smooth, but it offers no skin benefit and may feel heavy on some.
In plain English
Polyacrylate-40 is a plastic-like ingredient that creates a thin, flexible film on your skin or lashes. Think of it like a clear, invisible glove that helps makeup or sunscreen stay in place longer and resist sweat or water. It doesn't moisturize or treat your skin—it's purely a texture and wear helper. You'll find it in long-wear foundations, waterproof mascaras, and sunscreens that claim to stay on through swimming or sweating.
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
Polyacrylate-40 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 Polyacrylate-40.
- 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
Polyacrylate-40 is a synthetic polymer—a large molecule made by linking smaller acrylic acid units. It belongs to the polyacrylate family, which are widely used in cosmetics as film-formers and thickeners. It is not derived from natural sources and is manufactured through chemical polymerization.
How it works
When applied, the water or solvent in the product evaporates, leaving behind a thin, flexible film of Polyacrylate-40 on the skin or hair. This film physically locks in pigments and other ingredients, improving water resistance and wear time. It also helps control the viscosity (thickness) of the product, making it easier to spread evenly.
Pros
Boosts wear time
Creates a flexible film that helps makeup and sunscreen resist sweat, water, and rubbing, so you don't have to reapply as often.
Improves texture
Helps products spread smoothly and evenly, reducing patchiness in foundations and sunscreens.
Cons and cautions
No skin benefit
Polyacrylate-40 is purely a performance ingredient—it doesn't hydrate, soothe, or treat the skin in any way.
Can feel heavy
On dry or sensitive skin, the film may feel tight, sticky, or uncomfortable, especially in layered routines.
Best for
- People who want long-wearing, water-resistant makeup or sunscreen
- Those with oily or combination skin who prefer a matte, stay-put finish
Use caution if
- Individuals with very dry or dehydrated skin, as the film can feel tight or accentuate flakiness
Usage tips
Safety summary
Polyacrylate-40 is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential. However, it is a synthetic polymer with no skin benefits and may not suit very dry or sensitive skin due to its film-forming nature.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have found polyacrylates generally safe for use in cosmetics. Research focuses on their film-forming and viscosity-modifying properties rather than skin health benefits. No significant toxicity or sensitization concerns have been identified at typical use levels.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA), EU (CosIng), and many other regions. No concentration restrictions are specified, but typical use levels are low (under 5%).
- Common uses
- Sunscreens, Foundations, Mascaras, Long-wear makeup, Water-resistant formulas
- Environmental note
- As a synthetic polymer, Polyacrylate-40 is not biodegradable and may contribute to microplastic pollution if washed down drains. Some brands are moving toward biodegradable alternatives.
Good to know
- Polyacrylate-40 is often used alongside other film-formers like Acrylates Copolymer to boost water resistance.
- It is considered safe for use in cosmetics at typical concentrations by major regulatory bodies.
- Unlike some older film-formers, Polyacrylate-40 is less likely to cause stinging or irritation.
Common questions
What is Polyacrylate-40 in beauty products?
Polyacrylate-40 is a plastic-like ingredient that creates a thin, flexible film on your skin or lashes. Think of it like a clear, invisible glove that helps makeup or sunscreen stay in place longer and resist sweat or water. It doesn't moisturize or treat your skin—it's purely a texture and wear helper. You'll find it in long-wear foundations, waterproof mascaras, and sunscreens that claim to stay on through swimming or sweating.
What does Polyacrylate-40 do in a beauty product?
When applied, the water or solvent in the product evaporates, leaving behind a thin, flexible film of Polyacrylate-40 on the skin or hair. This film physically locks in pigments and other ingredients, improving water resistance and wear time. It also helps control the viscosity (thickness) of the product, making it easier to spread evenly.
Is Polyacrylate-40 safe for most people?
Polyacrylate-40 is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential. However, it is a synthetic polymer with no skin benefits and may not suit very dry or sensitive skin due to its film-forming nature.
Who should be careful with Polyacrylate-40?
Individuals with very dry or dehydrated skin, as the film can feel tight or accentuate flakiness
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.