Ingredient review
Acrylates/Beheneth-25 Methacrylate/Steareth-30 Methacrylate Copolymer
INCI: ACRYLATES/BEHENETH-25 METHACRYLATE/STEARETH-30 METHACRYLATE COPOLYMER
A safe, synthetic thickener and stabilizer that helps create a smooth, pleasant texture in many skincare products.
In plain English
This is a synthetic ingredient that helps give skincare products a nice, smooth texture. It works by thickening the formula and keeping all the ingredients mixed together so they don't separate. It also helps the product spread easily on your skin and can leave a light, invisible film that helps other ingredients stay put.
Quick decision guide
Useful, but context matters
Acrylates/Beheneth-25 Methacrylate/Steareth-30 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/Beheneth-25 Methacrylate/Steareth-30 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 high-molecular-weight synthetic polymer made from acrylic acid and two types of fatty alcohol-derived methacrylates. It is designed to provide thickening, stabilizing, and film-forming properties in water-based cosmetic formulations.
How it works
When added to a water-based formula, the polymer chains swell and entangle, increasing the viscosity (thickness). The long fatty chains (beheneth and steareth) also help stabilize emulsions by interacting with both water and oil phases, preventing separation. Upon drying, it forms a flexible, invisible film on the skin.
Pros
Excellent texture enhancer
This polymer gives creams and lotions a silky, smooth feel that spreads easily without being sticky or greasy.
Strong stabilizing power
It helps prevent your product from separating into oil and water layers, so you get a consistent formula every time you use it.
Cons and cautions
Synthetic origin
It is made in a lab, which may be a concern if you prefer only naturally derived ingredients in your skincare.
Potential tackiness at high levels
In formulas with a very high concentration, it can leave a slightly tacky or heavy feeling on the skin.
Best for
- Anyone who enjoys a smooth, non-greasy cream or lotion texture
- People looking for stable, long-lasting sunscreen formulas
Use caution if
- Those who strictly avoid all synthetic ingredients in their routine
Usage tips
Safety summary
This ingredient has a strong safety profile with very low irritation and comedogenic potential. It is well-tolerated by most skin types, including sensitive skin, when used in typical cosmetic concentrations.
Research notes
While specific studies on this exact copolymer are limited, the broader class of acrylate copolymers has been extensively reviewed and found safe for cosmetic use. The Cosmetic Ingredient Review (CIR) panel has concluded that similar acrylate copolymers are safe when formulated to be non-irritating.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and the European Commission, with no known restrictions at typical use levels.
- Common uses
- Moisturizers, Sunscreens, Serums, Makeup
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in very small amounts and is not considered a major environmental concern compared to microplastics.
Good to know
- This polymer is often used in combination with other thickeners like carbomer to fine-tune texture.
- It is considered safe by major regulatory bodies when used in cosmetic concentrations.
Common questions
What is Acrylates/Beheneth-25 Methacrylate/Steareth-30 Methacrylate Copolymer in beauty products?
This is a synthetic ingredient that helps give skincare products a nice, smooth texture. It works by thickening the formula and keeping all the ingredients mixed together so they don't separate. It also helps the product spread easily on your skin and can leave a light, invisible film that helps other ingredients stay put.
What does Acrylates/Beheneth-25 Methacrylate/Steareth-30 Methacrylate Copolymer do in a beauty product?
When added to a water-based formula, the polymer chains swell and entangle, increasing the viscosity (thickness). The long fatty chains (beheneth and steareth) also help stabilize emulsions by interacting with both water and oil phases, preventing separation. Upon drying, it forms a flexible, invisible film on the skin.
Is Acrylates/Beheneth-25 Methacrylate/Steareth-30 Methacrylate Copolymer safe for most people?
This ingredient has a strong safety profile with very low irritation and comedogenic potential. It is well-tolerated by most skin types, including sensitive skin, when used in typical cosmetic concentrations.
Who should be careful with Acrylates/Beheneth-25 Methacrylate/Steareth-30 Methacrylate Copolymer?
Those who strictly avoid all synthetic ingredients in their routine
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.