Ingredient review
Steareth-10 Allyl Ether/Acrylates Copolymer
INCI: STEARETH-10 ALLYL ETHER/ACRYLATES COPOLYMER
A safe synthetic polymer that helps makeup and sunscreen stay put longer without feeling heavy.
In plain English
This is a man-made ingredient that forms a thin, flexible film on your skin. It helps products like foundation or sunscreen resist water, sweat, and rubbing off, so they last longer. It also thickens formulas slightly, giving them a smooth, spreadable texture. Think of it as a gentle glue that holds the product in place without clogging pores or causing irritation for most people.
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
Steareth-10 Allyl Ether/Acrylates 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 Steareth-10 Allyl Ether/Acrylates 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 steareth-10 allyl ether and acrylates. It is a film-forming agent that creates a flexible, water-resistant layer on the skin or hair.
How it works
When applied, the polymer dries into a thin, invisible film that adheres to the skin. This film helps lock in other ingredients and prevents the product from smudging or washing away easily. It also increases the viscosity of the formula, giving it a richer feel.
Pros
Long-lasting wear
Helps makeup and sunscreen resist smudging, water, and sweat, so you don't have to reapply as often.
Lightweight feel
Forms a thin, flexible film that doesn't feel heavy or sticky on the skin, unlike some older film-formers.
Cons and cautions
Removal can be tricky
Because it's water-resistant, you may need an oil-based cleanser or micellar water to fully remove products containing this polymer.
Potential tightness
On very dry or sensitive skin, the film can create a slight tightening sensation, which some find uncomfortable.
Best for
- People who want long-lasting makeup or sunscreen
- Those with oily or combination skin who prefer matte finishes
Use caution if
- Individuals with very dry or compromised skin barriers who may find film-formers too occlusive
Usage tips
Safety summary
Steareth-10 Allyl Ether/Acrylates Copolymer is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with very sensitive or dry skin may experience mild tightness. No significant health concerns have been reported in scientific literature.
Research notes
Research on this specific copolymer is limited, but the broader class of acrylates copolymers is well-studied and considered safe for topical use. The Cosmetic Ingredient Review (CIR) panel has reviewed similar film-formers and found them safe as used.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the FDA (USA) and EU CosIng database, with no concentration restrictions.
- Common uses
- Foundations, Sunscreens, Mascaras, Long-wear makeup
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate.
Good to know
- This ingredient is commonly found in 'transfer-proof' or '24-hour wear' makeup formulas.
- It is considered safe by major cosmetic regulatory bodies when used as directed.
Common questions
What is Steareth-10 Allyl Ether/Acrylates Copolymer in beauty products?
This is a man-made ingredient that forms a thin, flexible film on your skin. It helps products like foundation or sunscreen resist water, sweat, and rubbing off, so they last longer. It also thickens formulas slightly, giving them a smooth, spreadable texture. Think of it as a gentle glue that holds the product in place without clogging pores or causing irritation for most people.
What does Steareth-10 Allyl Ether/Acrylates Copolymer do in a beauty product?
When applied, the polymer dries into a thin, invisible film that adheres to the skin. This film helps lock in other ingredients and prevents the product from smudging or washing away easily. It also increases the viscosity of the formula, giving it a richer feel.
Is Steareth-10 Allyl Ether/Acrylates Copolymer safe for most people?
Steareth-10 Allyl Ether/Acrylates Copolymer is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with very sensitive or dry skin may experience mild tightness. No significant health concerns have been reported in scientific literature.
Who should be careful with Steareth-10 Allyl Ether/Acrylates Copolymer?
Individuals with very dry or compromised skin barriers who may find film-formers too occlusive
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.