Ingredient review

Perfluorononylethyl Dimethicone/Methicone Copolymer

INCI: PERFLUORONONYLETHYL DIMETHICONE/METHICONE COPOLYMER

A high-performance film former that helps products resist water and sweat, but its synthetic nature and potential environmental persistence raise some concerns.

beautyskincarefilm-former

In plain English

This ingredient is a man-made polymer that combines silicone and fluorinated chemistry. It spreads into a very thin, flexible, and water-resistant film on your skin or hair. Think of it as a high-tech shield that helps makeup stay put and sunscreen remain effective even when you sweat or swim. It feels smooth and lightweight, not greasy or heavy.

Review score

Safety, usefulness, and evidence

3.8Good
3.8/ 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
synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Perfluorononylethyl Dimethicone/Methicone 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 Perfluorononylethyl Dimethicone/Methicone 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 synthetic copolymer made by combining a fluorinated alkyl group (perfluorononylethyl) with a silicone backbone (dimethicone/methicone). It belongs to a class of ingredients known as fluorosilicones, which are designed to provide both water repellency and a silky feel.

How it works

When applied, the copolymer forms a uniform, breathable film on the surface of the skin or hair. The fluorinated part repels water and oil, while the silicone part provides spreadability and a smooth, non-tacky finish. This dual action helps lock in other ingredients (like sunscreen filters or pigments) and prevents them from being washed or rubbed off easily.

Pros

Excellent water resistance

Helps products withstand sweat, humidity, and swimming, making it ideal for active lifestyles or humid climates.

Smooth, lightweight feel

Unlike some heavy waxes or oils, this copolymer spreads easily and leaves a silky, non-sticky finish that many users find pleasant.

Cons and cautions

Environmental persistence concerns

As a fluorinated compound, it may be part of the broader PFAS family, which has raised environmental and health concerns due to its slow breakdown in nature.

Can be hard to remove

Its strong water-resistant film may require an oil-based cleanser or double cleansing to fully remove, which can be inconvenient for some.

Best for

  • People who need long-wearing, water-resistant makeup or sunscreen
  • Those with oily or combination skin who want a matte, stay-put finish

Use caution if

  • Individuals concerned about PFAS chemicals and environmental impact
  • Those with very sensitive or reactive skin who prefer minimal synthetic ingredients

Usage tips

Use an oil-based cleanser or micellar water first to break down the film, then follow with your regular cleanser.
Apply sparingly — a little goes a long way in creating a water-resistant barrier.
If you have dry skin, pair with a hydrating serum or moisturizer underneath to avoid any potential drying effect from the film.

Safety summary

Generally considered safe for topical use in cosmetics at low concentrations. The ingredient has low irritation and comedogenic potential. However, its classification as a PFAS-related compound means there is ongoing debate about its long-term environmental and health impact. Most studies focus on other PFAS, so direct data on this specific copolymer is limited.

Research notes

Research on this specific copolymer is sparse. Most evidence comes from its structural similarity to other fluorosilicones used in cosmetics. Studies confirm its film-forming and water-repellent properties. Safety assessments by cosmetic ingredient review panels have not flagged acute toxicity, but long-term environmental persistence is a known concern for the broader PFAS class.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the US (FDA) and EU (CosIng) at typical concentrations. However, due to its fluorinated nature, it may fall under broader PFAS scrutiny in some regions.
Common uses
Long-wear foundations, Waterproof mascaras, Sunscreens, Hair styling products, Lip products
Environmental note
Perfluorononylethyl dimethicone/methicone copolymer is a synthetic fluorinated compound that may persist in the environment. Its production and disposal contribute to the accumulation of PFAS chemicals, which are under increasing regulatory and environmental review.

Good to know

  • This ingredient is often found in 'transfer-proof' or '24-hour wear' makeup products.
  • It is not water-soluble, so it won't wash off with water alone.
  • Some regulatory bodies are reviewing fluorinated compounds; check local guidelines if you are formulating products.

Common questions

What is Perfluorononylethyl Dimethicone/Methicone Copolymer in beauty products?

This ingredient is a man-made polymer that combines silicone and fluorinated chemistry. It spreads into a very thin, flexible, and water-resistant film on your skin or hair. Think of it as a high-tech shield that helps makeup stay put and sunscreen remain effective even when you sweat or swim. It feels smooth and lightweight, not greasy or heavy.

What does Perfluorononylethyl Dimethicone/Methicone Copolymer do in a beauty product?

When applied, the copolymer forms a uniform, breathable film on the surface of the skin or hair. The fluorinated part repels water and oil, while the silicone part provides spreadability and a smooth, non-tacky finish. This dual action helps lock in other ingredients (like sunscreen filters or pigments) and prevents them from being washed or rubbed off easily.

Is Perfluorononylethyl Dimethicone/Methicone Copolymer safe for most people?

Generally considered safe for topical use in cosmetics at low concentrations. The ingredient has low irritation and comedogenic potential. However, its classification as a PFAS-related compound means there is ongoing debate about its long-term environmental and health impact. Most studies focus on other PFAS, so direct data on this specific copolymer is limited.

Who should be careful with Perfluorononylethyl Dimethicone/Methicone Copolymer?

Individuals concerned about PFAS chemicals and environmental impact Those with very sensitive or reactive skin who prefer minimal synthetic ingredients

Research sources

CosIng - European Commission ingredient databaseOpenFDA Cosmetics Ingredient DirectoryOpenPubMed - Fluorosilicones in cosmetics reviewOpenEnvironmental Working Group - PFAS in cosmeticsOpen

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.