Ingredient review
Perfluorononylethyl PEG-8 Dimethicone
INCI: PERFLUORONONYLETHYL PEG-8 DIMETHICONE
A high-tech film former that provides a silky, water-resistant finish, but its environmental persistence raises concerns.
In plain English
This ingredient is a man-made hybrid of silicone and fluorinated compounds. It spreads easily on skin or hair, forming a thin, flexible film that feels silky and helps other ingredients stay put. Because it resists water and oil, it's great for long-wear makeup and sunscreens. However, fluorinated ingredients can be controversial due to their persistence in the environment.
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 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 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 synthetic polymer that combines a silicone backbone (PEG-8 Dimethicone) with a fluorinated side chain (perfluorononylethyl). This structure gives it both the smooth feel of silicones and the water/oil repellency of fluorocarbons.
How it works
When applied, the ingredient spreads into a thin, uniform film on the skin or hair surface. The fluorinated part repels water and oil, while the silicone part provides a silky, non-greasy feel. This film helps lock in other ingredients and prevents them from being washed away by sweat or water.
Pros
Excellent water resistance
Helps products stay put through sweat, humidity, and swimming, reducing the need for frequent touch-ups.
Silky, non-greasy feel
Spreads easily and leaves a smooth, velvety finish without clogging pores or feeling heavy.
Cons and cautions
Environmental persistence
Fluorinated compounds like this one can break down very slowly in the environment, raising concerns about long-term ecological impact.
May require double cleansing
Its strong film-forming ability can make it stubborn to remove with a single gentle cleanser, often needing an oil-based first step.
Best for
- People who want long-wearing, water-resistant makeup or sunscreen
- Those with oily skin who prefer a matte, non-greasy finish
Use caution if
- Individuals who prefer only biodegradable or naturally derived ingredients
Usage tips
Safety summary
Generally considered safe for topical use in cosmetics at typical concentrations. Skin irritation and allergy are rare. The main concern is environmental persistence rather than direct human toxicity.
Research notes
Most safety data come from industry studies and regulatory reviews (e.g., CIR). There is limited independent research on this specific compound, but related fluorinated silicones are well-studied for low skin irritancy. Environmental persistence is a known issue for the broader class of perfluorinated substances.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and many other regions. However, some fluorinated compounds are under increasing regulatory scrutiny for environmental reasons.
- Common uses
- Long-wear foundations, Waterproof mascaras, Sunscreens, Hair serums, Primers
- Environmental note
- Perfluorinated compounds are known to be highly persistent in the environment. While this specific ingredient is a large polymer that may not be bioavailable, its degradation products are a concern. Some brands are moving away from fluorinated ingredients for this reason.
Good to know
- This ingredient is often found in 'transfer-proof' or '24-hour wear' makeup formulas.
- It is not the same as PTFE (Teflon), but shares some similar water-repellent properties.
Common questions
What is Perfluorononylethyl PEG-8 Dimethicone in beauty products?
This ingredient is a man-made hybrid of silicone and fluorinated compounds. It spreads easily on skin or hair, forming a thin, flexible film that feels silky and helps other ingredients stay put. Because it resists water and oil, it's great for long-wear makeup and sunscreens. However, fluorinated ingredients can be controversial due to their persistence in the environment.
What does Perfluorononylethyl PEG-8 Dimethicone do in a beauty product?
When applied, the ingredient spreads into a thin, uniform film on the skin or hair surface. The fluorinated part repels water and oil, while the silicone part provides a silky, non-greasy feel. This film helps lock in other ingredients and prevents them from being washed away by sweat or water.
Is Perfluorononylethyl PEG-8 Dimethicone safe for most people?
Generally considered safe for topical use in cosmetics at typical concentrations. Skin irritation and allergy are rare. The main concern is environmental persistence rather than direct human toxicity.
Who should be careful with Perfluorononylethyl PEG-8 Dimethicone?
Individuals who prefer only biodegradable or naturally derived 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.