Ingredient review

Dilinoleic Acid/Glycol Copolymer

INCI: DILINOLEIC ACID/GLYCOL COPOLYMER

A gentle film-forming polymer that helps skincare and makeup stay put without clogging pores or irritating skin.

beautyskincarefilm-former

In plain English

This ingredient is a type of polymer, which is a large molecule made of repeating smaller units. It's created from dilinoleic acid (a fatty acid from plant oils) and glycol (a type of alcohol). In cosmetics, it forms a thin, flexible film on your skin that helps other ingredients stay in place and makes products more water-resistant. Think of it like a gentle, invisible shield that helps your sunscreen or foundation last longer without feeling heavy or sticky.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
semi synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Dilinoleic Acid/Glycol 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Dilinoleic Acid/Glycol Copolymer.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A semi-synthetic copolymer synthesized from dilinoleic acid (derived from plant-based fatty acids) and glycol. It belongs to a class of ingredients called film-formers, which create a continuous layer on the skin's surface.

How it works

When applied, the polymer molecules link together to form a thin, flexible film on the skin. This film helps other ingredients (like UV filters or pigments) adhere better and resist wash-off from water or sweat. It also slightly thickens the product's texture, making it easier to spread evenly.

Pros

Enhances water resistance

Helps sunscreens and makeup stay effective longer during swimming, sweating, or humid conditions, so you don't have to reapply as often.

Lightweight feel

Unlike some heavy waxes or oils, this polymer forms a thin, flexible film that doesn't feel greasy or sticky on the skin.

Cons and cautions

May require double cleansing

Because it forms a water-resistant film, it can be stubborn to remove with just water or a gentle cleanser. An oil-based cleanser or micellar water is often needed to fully wash it off.

Potential tightness for dry skin

On very dry or compromised skin, the film can sometimes feel slightly tight or drying, especially if used in high concentrations.

Best for

  • People who want long-lasting, water-resistant sunscreen or makeup
  • Those with normal to oily skin who prefer a matte finish

Use caution if

  • Individuals with extremely dry or compromised skin barriers who may find film-formers too occlusive

Usage tips

Use an oil-based cleanser or micellar water first to break down the film before your regular water-based cleanser.
If you have dry skin, pair products containing this polymer with a good moisturizer underneath to prevent any tightness.

Safety summary

Dilinoleic Acid/Glycol Copolymer is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential, making it suitable for most skin types. No significant safety concerns have been reported in regulatory reviews.

Research notes

Research on this specific polymer is limited, but it is structurally similar to other safe film-forming agents used in cosmetics. Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that related polymers are safe at typical use concentrations.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no known restrictions.
Common uses
Sunscreens, Water-resistant formulations, Long-wear makeup, Moisturizers
Environmental note
As a synthetic polymer, its biodegradability is limited. However, it is not known to bioaccumulate significantly.

Good to know

  • This ingredient is often found in 'water-resistant' or 'sweatproof' sunscreens and long-wear foundations.
  • It is considered safe and non-irritating by major cosmetic safety panels.

Common questions

What is Dilinoleic Acid/Glycol Copolymer in beauty products?

This ingredient is a type of polymer, which is a large molecule made of repeating smaller units. It's created from dilinoleic acid (a fatty acid from plant oils) and glycol (a type of alcohol). In cosmetics, it forms a thin, flexible film on your skin that helps other ingredients stay in place and makes products more water-resistant. Think of it like a gentle, invisible shield that helps your sunscreen or foundation last longer without feeling heavy or sticky.

What does Dilinoleic Acid/Glycol Copolymer do in a beauty product?

When applied, the polymer molecules link together to form a thin, flexible film on the skin. This film helps other ingredients (like UV filters or pigments) adhere better and resist wash-off from water or sweat. It also slightly thickens the product's texture, making it easier to spread evenly.

Is Dilinoleic Acid/Glycol Copolymer safe for most people?

Dilinoleic Acid/Glycol Copolymer is considered safe for topical use in cosmetics. It has low irritation and comedogenic potential, making it suitable for most skin types. No significant safety concerns have been reported in regulatory reviews.

Who should be careful with Dilinoleic Acid/Glycol Copolymer?

Individuals with extremely dry or compromised skin barriers who may find film-formers too occlusive

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of PolymersOpenEU CosIng Database - Dilinoleic Acid/Glycol CopolymerOpenPubMed - Film-Forming Polymers in SunscreensOpen

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.