Ingredient review
Vinyl Buteth-25/Sodium Maleate Copolymer
INCI: VINYL BUTETH-25/SODIUM MALEATE COPOLYMER
A synthetic polymer that helps products stay put, resist water, and feel smooth, but offers no active skincare benefit.
In plain English
This is a man-made ingredient that forms a thin, flexible film on your skin or hair. It helps makeup and sunscreen stay in place longer, resist sweat and water, and feel smooth when applied. Think of it like a clear, invisible shield that holds everything together without feeling heavy or sticky.
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
Vinyl Buteth-25/Sodium Maleate 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 Vinyl Buteth-25/Sodium Maleate 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 by combining vinyl buteth-25 and sodium maleate monomers. It is designed to form a flexible, water-resistant film on the skin or hair surface.
How it works
When applied, the polymer molecules spread into a thin, even layer. As the solvent (water or alcohol) evaporates, the polymer chains link together to create a continuous film. This film physically locks in pigments, UV filters, and other ingredients, improving adhesion and resistance to water, sweat, and rubbing.
Pros
Boosts wear time
Helps makeup and sunscreen last longer without fading or rubbing off, even in humid or sweaty conditions.
Lightweight feel
Unlike some older film-formers, this polymer creates a thin, flexible film that doesn't feel heavy or cakey on the skin.
Cons and cautions
No active benefit
It only improves texture and durability—it doesn't hydrate, soothe, or treat skin concerns.
Environmental persistence
As a synthetic polymer, it is not readily biodegradable and may contribute to microplastic pollution in waterways.
Best for
- People who want long-wearing, water-resistant makeup or sunscreen
- Those with normal to oily skin who prefer a matte finish
Use caution if
- Individuals with very dry or dehydrated skin who may find film-formers uncomfortable
- Anyone seeking purely natural or biodegradable ingredients
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No known systemic toxicity from topical use. However, its environmental persistence is a growing concern.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that similar film-forming polymers are safe when formulated properly. No specific studies on this exact copolymer were found, but the class is well-understood.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. No specific concentration restrictions, but must be used in accordance with good manufacturing practices.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations, Mascaras
- Environmental note
- As a synthetic polymer, it is not biodegradable. Some jurisdictions are considering restrictions on non-biodegradable polymers in rinse-off products.
Good to know
- Often found in 'waterproof' or 'long-wear' labeled products.
- Can be combined with other film-formers for even stronger resistance.
Common questions
What is Vinyl Buteth-25/Sodium Maleate Copolymer in beauty products?
This is a man-made ingredient that forms a thin, flexible film on your skin or hair. It helps makeup and sunscreen stay in place longer, resist sweat and water, and feel smooth when applied. Think of it like a clear, invisible shield that holds everything together without feeling heavy or sticky.
What does Vinyl Buteth-25/Sodium Maleate Copolymer do in a beauty product?
When applied, the polymer molecules spread into a thin, even layer. As the solvent (water or alcohol) evaporates, the polymer chains link together to create a continuous film. This film physically locks in pigments, UV filters, and other ingredients, improving adhesion and resistance to water, sweat, and rubbing.
Is Vinyl Buteth-25/Sodium Maleate Copolymer safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No known systemic toxicity from topical use. However, its environmental persistence is a growing concern.
Who should be careful with Vinyl Buteth-25/Sodium Maleate Copolymer?
Individuals with very dry or dehydrated skin who may find film-formers uncomfortable Anyone seeking purely natural or biodegradable ingredients
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.