Ingredient review
Acrylates/Steareth-20 Methacrylate Copolymer
INCI: ACRYLATES/STEARETH-20 METHACRYLATE COPOLYMER
A safe, synthetic polymer that improves product texture and water resistance without common irritation concerns.
In plain English
This is a synthetic ingredient that forms a thin, flexible film on your skin or hair. It helps other ingredients spread evenly, makes products feel smoother, and can improve water resistance in sunscreens or long-wear makeup. Think of it like a gentle, invisible shield that doesn't clog pores or cause irritation for most people.
Quick decision guide
Useful, but context matters
Acrylates/Steareth-20 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 Acrylates/Steareth-20 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 acrylic acid derivatives and a steareth-20 methacrylate unit. It is a film-forming agent and viscosity modifier commonly used in cosmetics to improve texture, spreadability, and water resistance.
How it works
When applied, the polymer molecules link together to create a thin, flexible film on the skin or hair surface. This film helps hold other ingredients in place, reduces water loss from the product, and can make formulas feel lighter and less greasy. It also helps thicken products so they are easier to apply evenly.
Pros
Enhances water resistance
Helps sunscreens and makeup stay put longer, even in humid conditions or during light activity.
Improves sensory feel
Creates a smooth, silky finish on skin and hair without the heavy or sticky residue some thickeners leave behind.
Cons and cautions
Synthetic origin
Not derived from natural sources, which may be a concern for those seeking plant-based or eco-friendly formulations.
Potential for tightness
In high concentrations or on very dry skin, the film can feel slightly tight or drying, though this is uncommon at typical levels.
Best for
- Anyone looking for lightweight, water-resistant sunscreens or makeup
- People with oily or combination skin who prefer non-greasy textures
Use caution if
- Those with very dry or sensitive skin who may find film-formers slightly tightening
Usage tips
Safety summary
Acrylates/Steareth-20 Methacrylate Copolymer is considered safe for use in cosmetics. It has low irritation and comedogenic potential, and no significant toxicity concerns have been identified in studies. It is not a common allergen.
Research notes
Research on this specific copolymer is limited, but the broader class of acrylate copolymers has been reviewed by the CIR panel and found safe. Studies show they do not penetrate the skin barrier and are well-tolerated in both rinse-off and leave-on products.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. The Cosmetic Ingredient Review (CIR) panel has evaluated it and found it safe for use in rinse-off and leave-on products at typical concentrations.
- Common uses
- Sunscreens, Moisturizers, Makeup, Hair styling products
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate. Some manufacturers are exploring bio-based alternatives.
Good to know
- This polymer is often used in combination with other film-formers to fine-tune texture and durability.
- It is considered safe by major regulatory bodies including the FDA and the Cosmetic Ingredient Review (CIR) panel.
Common questions
What is Acrylates/Steareth-20 Methacrylate Copolymer in beauty products?
This is a synthetic ingredient that forms a thin, flexible film on your skin or hair. It helps other ingredients spread evenly, makes products feel smoother, and can improve water resistance in sunscreens or long-wear makeup. Think of it like a gentle, invisible shield that doesn't clog pores or cause irritation for most people.
What does Acrylates/Steareth-20 Methacrylate Copolymer do in a beauty product?
When applied, the polymer molecules link together to create a thin, flexible film on the skin or hair surface. This film helps hold other ingredients in place, reduces water loss from the product, and can make formulas feel lighter and less greasy. It also helps thicken products so they are easier to apply evenly.
Is Acrylates/Steareth-20 Methacrylate Copolymer safe for most people?
Acrylates/Steareth-20 Methacrylate Copolymer is considered safe for use in cosmetics. It has low irritation and comedogenic potential, and no significant toxicity concerns have been identified in studies. It is not a common allergen.
Who should be careful with Acrylates/Steareth-20 Methacrylate Copolymer?
Those with very dry or sensitive skin who may find film-formers slightly tightening
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.