Ingredient review

Perfluorononylethyl Carboxy PEG-7 Dimethicone Phosphate

INCI: PERFLUORONONYLETHYL CARBOXY PEG-7 DIMETHICONE PHOSPHATE

A specialized silicone surfactant that improves water resistance and spreadability, but its complex chemistry and environmental persistence raise caution.

beautyskincaresurfactant

In plain English

This ingredient is a hybrid molecule that combines a silicone backbone with a perfluorinated (fluorocarbon) tail and a phosphate group. In simple terms, it helps other ingredients spread evenly on skin or hair and forms a thin, water-resistant film. It's often used in sunscreens and long-wear makeup to keep products from washing off or smudging. Because it contains a perfluorinated segment, it is very stable and can persist in the environment, which is a concern for some consumers.

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 Carboxy PEG-7 Dimethicone Phosphate 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 Carboxy PEG-7 Dimethicone Phosphate.
  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, multi-functional surfactant made by attaching a perfluorinated carbon chain, a silicone chain, and a phosphate group to a polyethylene glycol (PEG) backbone. It is designed to reduce surface tension and create durable, water-repellent films.

How it works

In a cosmetic product, this molecule sits at the interface between oil and water (or between the formula and skin). Its perfluorinated and silicone parts repel water and oil, while the phosphate and PEG parts help it mix with water. This allows it to stabilize emulsions, improve spreadability, and leave a protective, water-resistant layer on the skin or hair.

Pros

Excellent water resistance

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

Smooth, even application

Reduces drag and patchiness, making it easier to apply products evenly without streaks.

Cons and cautions

Environmental persistence concern

The perfluorinated part of the molecule is very stable and may not break down easily in nature, raising questions about long-term ecological impact.

Synthetic complexity

Its multi-component structure means it's not a simple, natural ingredient, which may be a turn-off for those preferring minimal or plant-based formulas.

Best for

  • People who need long-wear, water-resistant makeup or sunscreen
  • Those with oily skin who prefer matte, non-greasy finishes

Use caution if

  • Consumers seeking fully biodegradable or 'green' ingredients

Usage tips

Look for it in water-resistant sunscreens or long-wear foundations for best performance.
If you have sensitive skin, patch-test first, as the combination of silicones and fluorinated compounds can sometimes cause irritation in rare cases.

Safety summary

Generally considered safe for topical use at typical concentrations. The perfluorinated component is not known to be absorbed through skin in significant amounts, but its environmental persistence is a growing concern.

Research notes

Limited peer-reviewed studies specifically on this ingredient. Most safety data comes from broader assessments of perfluorinated and silicone surfactants, which indicate low acute toxicity but potential for environmental persistence.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics in the US (FDA) and EU (CosIng). However, perfluorinated compounds are under increasing regulatory scrutiny for environmental reasons.
Common uses
Sunscreens, Long-wear foundations, Water-resistant makeup, Hair styling products
Environmental note
Perfluorinated segments are highly persistent in the environment. Some jurisdictions are considering restrictions on such compounds due to bioaccumulation concerns.

Good to know

  • This ingredient is often listed near the end of an INCI list because it is used at low concentrations.
  • It is not the same as simple dimethicone; its fluorinated part gives it extra water repellency.

Common questions

What is Perfluorononylethyl Carboxy PEG-7 Dimethicone Phosphate in beauty products?

This ingredient is a hybrid molecule that combines a silicone backbone with a perfluorinated (fluorocarbon) tail and a phosphate group. In simple terms, it helps other ingredients spread evenly on skin or hair and forms a thin, water-resistant film. It's often used in sunscreens and long-wear makeup to keep products from washing off or smudging. Because it contains a perfluorinated segment, it is very stable and can persist in the environment, which is a concern for some consumers.

What does Perfluorononylethyl Carboxy PEG-7 Dimethicone Phosphate do in a beauty product?

In a cosmetic product, this molecule sits at the interface between oil and water (or between the formula and skin). Its perfluorinated and silicone parts repel water and oil, while the phosphate and PEG parts help it mix with water. This allows it to stabilize emulsions, improve spreadability, and leave a protective, water-resistant layer on the skin or hair.

Is Perfluorononylethyl Carboxy PEG-7 Dimethicone Phosphate safe for most people?

Generally considered safe for topical use at typical concentrations. The perfluorinated component is not known to be absorbed through skin in significant amounts, but its environmental persistence is a growing concern.

Who should be careful with Perfluorononylethyl Carboxy PEG-7 Dimethicone Phosphate?

Consumers seeking fully biodegradable or 'green' ingredients

Research sources

CosIng - European Commission databaseOpenFDA - Cosmetic Ingredient DirectoryOpenPubMed - Safety of perfluorinated 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.