Ingredient review
Sodium Acrylate/Acrolein Copolymer
INCI: SODIUM ACRYLATE/ACROLEIN COPOLYMER
A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.
In plain English
This is a man-made ingredient that forms a thin, flexible film on your skin. Think of it like a clear, invisible layer that helps makeup or sunscreen stay in place longer and resist sweat or water. It doesn't moisturize or treat skin—it's purely a texture and performance helper.
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
Sodium Acrylate/Acrolein 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 Sodium Acrylate/Acrolein 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 from sodium acrylate and acrolein monomers. It belongs to a class of ingredients called film-formers, which are commonly used in cosmetics to improve wear and water resistance.
How it works
When applied, the copolymer dries into a continuous, flexible film on the skin's surface. This film acts as a barrier that helps other ingredients (like pigments or UV filters) adhere better and resist being washed off by water or sweat. It also slightly thickens the product's texture.
Pros
Boosts wear time
Helps makeup and sunscreen stay put for hours, even in humid or wet conditions.
Enhances water resistance
Creates a protective film that reduces product wash-off from sweat or swimming.
Cons and cautions
No skin benefit
This ingredient is purely functional—it doesn't hydrate, soothe, or treat the skin.
Potential tightness
On very dry or sensitive skin, the film can feel tight or slightly uncomfortable.
Best for
- People who need long-wearing or waterproof makeup
- Those who use water-resistant sunscreens for outdoor activities
Use caution if
- Individuals with very dry or compromised skin barriers who may find film-formers uncomfortable
Usage tips
Safety summary
Generally considered safe for topical use at typical concentrations. Low irritation and comedogenic risk. No significant safety alerts from major regulatory bodies.
Research notes
Limited peer-reviewed studies specifically on this copolymer. Safety is inferred from its chemical class and long history of use in cosmetics. No known toxicity or sensitization in standard tests.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng). No specific concentration limits are set, but it is used at low levels.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations, Eye liners
- Environmental note
- As a synthetic polymer, it is not readily biodegradable. Microplastic concerns are being studied, but current data is limited.
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 sodium acrylate copolymer, which is a different polymer used as a thickener.
Common questions
What is Sodium Acrylate/Acrolein Copolymer in beauty products?
This is a man-made ingredient that forms a thin, flexible film on your skin. Think of it like a clear, invisible layer that helps makeup or sunscreen stay in place longer and resist sweat or water. It doesn't moisturize or treat skin—it's purely a texture and performance helper.
What does Sodium Acrylate/Acrolein Copolymer do in a beauty product?
When applied, the copolymer dries into a continuous, flexible film on the skin's surface. This film acts as a barrier that helps other ingredients (like pigments or UV filters) adhere better and resist being washed off by water or sweat. It also slightly thickens the product's texture.
Is Sodium Acrylate/Acrolein Copolymer safe for most people?
Generally considered safe for topical use at typical concentrations. Low irritation and comedogenic risk. No significant safety alerts from major regulatory bodies.
Who should be careful with Sodium Acrylate/Acrolein Copolymer?
Individuals with very dry or compromised skin barriers who may find film-formers uncomfortable
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.