Ingredient review
Dibutyl Fumarate Copolymer
INCI: DIBUTYL FUMARATE/HEXADECENE/TETRADECENE COPOLYMER
A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.
In plain English
This is a man-made ingredient that forms a thin, flexible film on your skin. Think of it like a clear, invisible shield that helps makeup or sunscreen stay in place longer and not wash off easily when you sweat or get wet. It doesn't treat or change your skin—it's purely a helper ingredient for product performance.
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
Dibutyl Fumarate 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 Dibutyl Fumarate 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 by combining dibutyl fumarate with hexadecene and tetradecene. It belongs to a class of ingredients called film formers, which are widely used in cosmetics to create a continuous layer on the skin or hair.
How it works
When applied, the copolymer molecules link together as the solvent evaporates, forming a flexible, water-resistant film. This film helps other ingredients (like sunscreen filters or pigments) stay evenly distributed and adhere to the skin for longer. It also adds a smooth, silky feel to the product.
Pros
Boosts water resistance
Helps sunscreens and makeup stay effective even when you sweat or swim, reducing the need for frequent reapplication.
Extends wear time
Creates a flexible film that keeps foundation, eyeliner, or lip color in place for hours without smudging or fading.
Cons and cautions
No active skincare benefit
This ingredient doesn't hydrate, soothe, or treat the skin—it's only there to improve product feel and performance.
Potential tackiness on oily skin
For people with very oily skin, the film can sometimes feel slightly sticky or heavy, especially in high-humidity conditions.
Best for
- Anyone wanting long-wearing or water-resistant makeup and sunscreen
- People who live in humid climates or have active lifestyles
Use caution if
- Those with very sensitive skin who prefer minimal synthetic ingredients
Usage tips
Safety summary
Dibutyl Fumarate/Hexadecene/Tetradecene Copolymer is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with very sensitive skin may want to patch-test products containing it.
Research notes
Safety assessments for similar film-forming polymers indicate low acute toxicity and skin irritation. Specific studies on this exact copolymer are limited, but its chemical class is well-established in cosmetics.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. It is not a restricted ingredient, but always follow local regulations.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations, Lip products
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate significantly.
Good to know
- This polymer is often used in combination with other film formers to fine-tune texture and flexibility.
- It is considered safe for use in cosmetics by major regulatory bodies when used as intended.
Common questions
What is Dibutyl Fumarate Copolymer in beauty products?
This is a man-made ingredient that forms a thin, flexible film on your skin. Think of it like a clear, invisible shield that helps makeup or sunscreen stay in place longer and not wash off easily when you sweat or get wet. It doesn't treat or change your skin—it's purely a helper ingredient for product performance.
What does Dibutyl Fumarate Copolymer do in a beauty product?
When applied, the copolymer molecules link together as the solvent evaporates, forming a flexible, water-resistant film. This film helps other ingredients (like sunscreen filters or pigments) stay evenly distributed and adhere to the skin for longer. It also adds a smooth, silky feel to the product.
Is Dibutyl Fumarate Copolymer safe for most people?
Dibutyl Fumarate/Hexadecene/Tetradecene Copolymer is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential, though individuals with very sensitive skin may want to patch-test products containing it.
Who should be careful with Dibutyl Fumarate Copolymer?
Those with very sensitive skin who prefer minimal synthetic 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.