Ingredient review
Perfluorononylethyl PEG-8 Phenylisopropyl Dimethicone
INCI: PERFLUORONONYLETHYL PEG-8 PHENYLISOPROPYL DIMETHICONE
A high-tech film-former that helps makeup last longer and resist water, but its environmental persistence raises concerns.
In plain English
This ingredient is a synthetic polymer that combines silicone and fluorinated chemistry. In cosmetics, it creates a flexible, water-resistant film on skin or hair. Think of it like a clear, breathable raincoat that helps makeup stay put and feel smooth. It's often used in long-wear and waterproof products. However, because it contains fluorinated components, it may be persistent in the environment, which is a growing concern for some consumers.
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
Perfluorononylethyl PEG-8 Phenylisopropyl 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Perfluorononylethyl PEG-8 Phenylisopropyl Dimethicone.
- 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 hybrid silicone-fluorinated polymer, specifically a perfluorononylethyl group attached to a PEG-8-modified silicone backbone with a phenylisopropyl side chain. It is a clear, viscous liquid that spreads easily.
How it works
When applied, the solvent evaporates and leaves behind a thin, flexible film that adheres to the skin or hair. The fluorinated part provides water and oil repellency, while the silicone part gives a smooth, non-greasy feel. This film helps lock in other ingredients and prevents makeup from smudging or fading.
Pros
Excellent film-forming
Creates a durable, flexible barrier that helps makeup last all day without cracking or flaking.
Water and oil resistant
Provides strong resistance to water, sweat, and sebum, making it ideal for long-wear and waterproof formulations.
Cons and cautions
Environmental persistence
The fluorinated part of the molecule is very stable and may accumulate in the environment, raising ecological concerns.
Removal difficulty
Because it forms a strong water-resistant film, it often requires an oil-based or dual-phase cleanser to remove completely.
Best for
- People who want long-wearing, waterproof makeup
- Those with normal to oily skin looking for smudge-proof products
Use caution if
- Individuals concerned about environmental impact of fluorinated compounds
- Those with very sensitive skin who prefer minimal synthetic ingredients
Usage tips
Safety summary
Generally considered safe for topical use at typical concentrations. Low irritation and comedogenic potential. The main concern is environmental persistence rather than direct human toxicity. Patch testing is recommended for sensitive individuals.
Research notes
Limited peer-reviewed studies specifically on this ingredient. Safety assessments rely on read-across from similar silicone and fluorinated polymers. Industry data supports its use as a safe film-former. Environmental persistence is an active area of research.
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 classified as a hazardous substance under GHS. However, regulatory scrutiny of perfluorinated compounds is increasing globally.
- Common uses
- Long-wear foundations, Waterproof mascaras, Lip products, Sunscreens, Primers
- Environmental note
- Perfluorinated compounds are known to be highly persistent in the environment. While this specific polymer is large and may not be bioavailable, its degradation products could be a concern. Some regions are considering restrictions on certain perfluorinated substances.
Good to know
- This ingredient is often listed near the end of an INCI list because it is used at low concentrations.
- It is a type of 'fluorosilicone' — a class of ingredients that combine the benefits of silicones and fluorocarbons.
- Some brands are moving away from fluorinated ingredients due to environmental concerns.
Common questions
What is Perfluorononylethyl PEG-8 Phenylisopropyl Dimethicone in beauty products?
This ingredient is a synthetic polymer that combines silicone and fluorinated chemistry. In cosmetics, it creates a flexible, water-resistant film on skin or hair. Think of it like a clear, breathable raincoat that helps makeup stay put and feel smooth. It's often used in long-wear and waterproof products. However, because it contains fluorinated components, it may be persistent in the environment, which is a growing concern for some consumers.
What does Perfluorononylethyl PEG-8 Phenylisopropyl Dimethicone do in a beauty product?
When applied, the solvent evaporates and leaves behind a thin, flexible film that adheres to the skin or hair. The fluorinated part provides water and oil repellency, while the silicone part gives a smooth, non-greasy feel. This film helps lock in other ingredients and prevents makeup from smudging or fading.
Is Perfluorononylethyl PEG-8 Phenylisopropyl Dimethicone safe for most people?
Generally considered safe for topical use at typical concentrations. Low irritation and comedogenic potential. The main concern is environmental persistence rather than direct human toxicity. Patch testing is recommended for sensitive individuals.
Who should be careful with Perfluorononylethyl PEG-8 Phenylisopropyl Dimethicone?
Individuals concerned about environmental impact of fluorinated compounds Those with very sensitive skin who prefer minimal synthetic ingredients
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.