Ingredient review

Perfluorononylethyl Carboxydecyl Lauryl Dimethicone

INCI: PERFLUORONONYLETHYL CARBOXYDECYL LAURYL DIMETHICONE

A high-tech film former that helps products resist water and feel silky, but its environmental persistence raises concerns.

beautyskincarefilm former

In plain English

This is a synthetic ingredient that combines silicone and fluorocarbon chemistry. In your skincare or makeup, it creates a very thin, flexible film on your skin that helps the product stay put longer, resist water and sweat, and feel smooth and silky. Think of it as a high-performance coating that makes your makeup last and your sunscreen stay effective even when you get wet.

Review score

Safety, usefulness, and evidence

3.5Good
3.5/ 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 Carboxydecyl Lauryl Dimethicone 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 Carboxydecyl Lauryl Dimethicone.
  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 large molecule made by joining a fluorocarbon chain (perfluorononylethyl) with a silicone chain (lauryl dimethicone) through a carboxydecyl linker. It is entirely synthetic and not found in nature.

How it works

When applied, the molecule spreads into an ultra-thin, even film that adheres to the skin. The fluorocarbon part repels water and oil, while the silicone part provides a smooth, non-greasy feel. This dual action helps the product resist being washed or rubbed off, and it can also help other ingredients stay on the skin longer.

Pros

Excellent water resistance

Helps sunscreens and makeup stay effective even when you sweat or swim, reducing the need for constant reapplication.

Silky, lightweight feel

Spreads easily and leaves a smooth, non-sticky finish that many people find pleasant on the skin.

Cons and cautions

Environmental persistence concerns

The fluorocarbon part of the molecule is similar to PFAS compounds, which do not break down easily in the environment and can accumulate.

Limited safety data

There is not a lot of independent research on this specific molecule's long-term effects on skin or the body, so its full safety profile is not well established.

Best for

  • People who want long-wearing, water-resistant makeup or sunscreen
  • Those with normal to dry skin who enjoy a silky finish

Use caution if

  • Individuals concerned about environmental persistence of fluorinated compounds
  • Those with very sensitive or acne-prone skin who prefer minimal synthetic ingredients

Usage tips

Use as part of a full routine: apply water-resistant sunscreen containing this ingredient as the last step before makeup.
Remove thoroughly with an oil-based cleanser or micellar water, as the film can be stubborn and may require double cleansing.
Patch test first if you have sensitive skin, even though irritation risk is low.

Safety summary

Generally considered safe for topical use in cosmetics at typical concentrations. Irritation and allergy are rare. However, long-term safety data specific to this molecule is limited, and its environmental persistence is a concern.

Research notes

Most evidence comes from manufacturer safety data and general knowledge of similar silicone and fluorocarbon compounds. Peer-reviewed studies on this exact ingredient are scarce. Regulatory bodies have not flagged it as hazardous, but the class of fluorinated compounds is being reviewed for environmental impact.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the US, EU, and many other regions. Not specifically restricted, but the broader class of fluorinated compounds is under increasing regulatory scrutiny.
Common uses
Long-wear foundations, Waterproof sunscreens, Eye makeup, Lip products, Primers
Environmental note
The fluorocarbon portion of this molecule is highly persistent in the environment and may contribute to bioaccumulation. It is not biodegradable.

Good to know

  • This ingredient is often found in 'long-wear' or 'waterproof' formulas.
  • It is not the same as traditional PFAS used in non-stick cookware, but it shares some chemical similarities.
  • Some brands are moving away from fluorinated ingredients due to environmental concerns.

Common questions

What is Perfluorononylethyl Carboxydecyl Lauryl Dimethicone in beauty products?

This is a synthetic ingredient that combines silicone and fluorocarbon chemistry. In your skincare or makeup, it creates a very thin, flexible film on your skin that helps the product stay put longer, resist water and sweat, and feel smooth and silky. Think of it as a high-performance coating that makes your makeup last and your sunscreen stay effective even when you get wet.

What does Perfluorononylethyl Carboxydecyl Lauryl Dimethicone do in a beauty product?

When applied, the molecule spreads into an ultra-thin, even film that adheres to the skin. The fluorocarbon part repels water and oil, while the silicone part provides a smooth, non-greasy feel. This dual action helps the product resist being washed or rubbed off, and it can also help other ingredients stay on the skin longer.

Is Perfluorononylethyl Carboxydecyl Lauryl Dimethicone safe for most people?

Generally considered safe for topical use in cosmetics at typical concentrations. Irritation and allergy are rare. However, long-term safety data specific to this molecule is limited, and its environmental persistence is a concern.

Who should be careful with Perfluorononylethyl Carboxydecyl Lauryl Dimethicone?

Individuals concerned about environmental persistence of fluorinated compounds Those with very sensitive or acne-prone skin who prefer minimal synthetic ingredients

Research sources

Cosmetic Ingredient Review (CIR) - Safety of SiliconesOpenEuropean Chemicals Agency (ECHA) - Perfluorononylethyl Carboxydecyl Lauryl DimethiconeOpenPubMed - Fluorinated compounds 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.