Ingredient review
Butyl Acrylate/Hydroxypropyl Dimethicone Acrylate Copolymer
INCI: Butyl Acrylate/Hydroxypropyl Dimethicone Acrylate Copolymer
A silicone-based film former that helps makeup and sunscreen stay put longer without feeling heavy or greasy.
In plain English
This is a synthetic ingredient made by combining acrylic and silicone molecules. In cosmetics, it creates a flexible, breathable film on the skin that helps other ingredients stay in place, resist water and sweat, and feel smooth. Think of it like a clear, invisible shield that keeps your makeup or sunscreen from sliding off during the day.
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
Butyl Acrylate/Hydroxypropyl Dimethicone Acrylate 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 Butyl Acrylate/Hydroxypropyl Dimethicone Acrylate 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 copolymer (a polymer made from two or more different monomers) that joins butyl acrylate with a silicone-modified acrylic compound. It is a synthetic, silicone-based film former designed for cosmetic use.
How it works
When applied, the copolymer forms a thin, flexible film on the skin's surface. This film helps lock in other ingredients (like pigments or UV filters), improves water and sweat resistance, and gives a smooth, silky feel. It also helps control viscosity, making products easier to spread.
Pros
Long-lasting wear
Helps makeup and sunscreen resist fading, smudging, and transferring throughout the day.
Water and sweat resistant
Ideal for active lifestyles or humid climates, keeping products intact even when you sweat or get wet.
Cons and cautions
Requires double cleansing
Because it forms a durable film, you may need an oil-based cleanser or micellar water to remove it completely.
Synthetic origin
Not natural or biodegradable, which may be a concern for those seeking eco-friendly or minimalist ingredient lists.
Best for
- People who want long-wearing makeup or waterproof products
- Those with oily or combination skin who need oil control
Use caution if
- Individuals who prefer 100% natural or silicone-free routines
- Those with very sensitive skin that reacts to film formers (rare)
Usage tips
Safety summary
Generally recognized as safe for topical cosmetic use. Low irritation and comedogenic potential. No significant safety concerns have been raised by regulatory agencies or independent reviews.
Research notes
Limited independent research specifically on this copolymer, but it is structurally similar to other acrylate and silicone film formers that have been well-studied for safety and efficacy. The Cosmetic Ingredient Review (CIR) panel has reviewed related acrylate copolymers and found them safe.
Common label clues
- Typical concentration
- 1–10% in leave-on products
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. No specific concentration restrictions are common, but formulators follow good manufacturing practices.
- Common uses
- Long-wear foundations, Waterproof mascaras, Sunscreens, Lip products, Setting sprays
- Environmental note
- As a synthetic silicone-acrylate copolymer, it is not biodegradable and may persist in the environment. Some brands are moving toward bio-based alternatives.
Good to know
- This ingredient is commonly found in 'transfer-proof' and '24-hour wear' makeup formulas.
- It is considered safe by major regulatory bodies when used as directed.
Common questions
What is Butyl Acrylate/Hydroxypropyl Dimethicone Acrylate Copolymer in beauty products?
This is a synthetic ingredient made by combining acrylic and silicone molecules. In cosmetics, it creates a flexible, breathable film on the skin that helps other ingredients stay in place, resist water and sweat, and feel smooth. Think of it like a clear, invisible shield that keeps your makeup or sunscreen from sliding off during the day.
What does Butyl Acrylate/Hydroxypropyl Dimethicone Acrylate Copolymer do in a beauty product?
When applied, the copolymer forms a thin, flexible film on the skin's surface. This film helps lock in other ingredients (like pigments or UV filters), improves water and sweat resistance, and gives a smooth, silky feel. It also helps control viscosity, making products easier to spread.
Is Butyl Acrylate/Hydroxypropyl Dimethicone Acrylate Copolymer safe for most people?
Generally recognized as safe for topical cosmetic use. Low irritation and comedogenic potential. No significant safety concerns have been raised by regulatory agencies or independent reviews.
Who should be careful with Butyl Acrylate/Hydroxypropyl Dimethicone Acrylate Copolymer?
Individuals who prefer 100% natural or silicone-free routines Those with very sensitive skin that reacts to film formers (rare)
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.