Ingredient review
Dimer Dilinoleic Acid Copolymer
INCI: DIETHYLENE GLYCOL/HYDROGENATED DIMER DILINOLEIC ACID COPOLYMER
A safe, synthetic film-former that helps products stay put and resist water without clogging pores.
In plain English
This ingredient is a type of plastic-like polymer that forms a thin, flexible film on your skin or hair. It's often added to sunscreens and long-wear makeup to make them water-resistant and help them last longer. Think of it as a clear, invisible shield that keeps the product in place 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
Dimer Dilinoleic Acid 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 Dimer Dilinoleic Acid 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 reacting diethylene glycol with hydrogenated dimer dilinoleic acid. It belongs to a family of ingredients known as film-formers, which are used to create a continuous layer on the skin.
How it works
When applied, the polymer molecules link together to form a thin, flexible film. This film helps other ingredients (like sunscreen filters or pigments) stay evenly distributed and resist being washed off by water or sweat. 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.
Lightweight feel
Unlike some older film-formers, this copolymer dries down to a flexible, non-tacky finish that doesn't feel heavy or sticky.
Cons and cautions
Synthetic origin
It is a man-made polymer, which may be a concern for those seeking fully natural or biodegradable formulations.
Potential tightness
On very dry or sensitive skin, the film can sometimes feel slightly tight or uncomfortable, especially if layered with other occlusive ingredients.
Best for
- Anyone wanting longer-lasting sunscreen or makeup
- People with oily skin who prefer matte, transfer-resistant products
Use caution if
- Those with extremely dry or compromised skin barriers who may find film-formers too occlusive
Usage tips
Safety summary
Considered safe for cosmetic use at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory reviews.
Research notes
Limited independent studies, but regulatory bodies (FDA, EU SCCS) have reviewed similar film-forming polymers and found them safe. The ingredient is well-established in commercial formulations.
Common label clues
- Typical concentration
- 1% to 10%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no known restrictions at typical use levels.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations, Lip products
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is not classified as a microplastic and is used in low concentrations.
Good to know
- Often used in combination with other film-formers to fine-tune texture and durability
- Commonly found in 'sport' or 'active' sunscreen formulas
Common questions
What is Dimer Dilinoleic Acid Copolymer in beauty products?
This ingredient is a type of plastic-like polymer that forms a thin, flexible film on your skin or hair. It's often added to sunscreens and long-wear makeup to make them water-resistant and help them last longer. Think of it as a clear, invisible shield that keeps the product in place without feeling heavy or sticky.
What does Dimer Dilinoleic Acid Copolymer do in a beauty product?
When applied, the polymer molecules link together to form a thin, flexible film. This film helps other ingredients (like sunscreen filters or pigments) stay evenly distributed and resist being washed off by water or sweat. It also adds a smooth, silky feel to the product.
Is Dimer Dilinoleic Acid Copolymer safe for most people?
Considered safe for cosmetic use at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns reported in regulatory reviews.
Who should be careful with Dimer Dilinoleic Acid Copolymer?
Those with extremely dry or compromised skin barriers who may find film-formers too occlusive
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.