Ingredient review
Ammonium C6-16 Perfluoroalkylethyl Phosphate
INCI: AMMONIUM C6-16 PERFLUOROALKYLETHYL PHOSPHATE
A synthetic ingredient that helps products resist water and oil, but raises environmental concerns due to its perfluoroalkyl structure.
In plain English
This is a man-made chemical that helps cosmetics stay put even when you sweat or go swimming. It works by forming a thin, invisible film on your skin that repels both water and oil. Think of it like a raincoat for your makeup. However, it belongs to a family of chemicals called PFAS (per- and polyfluoroalkyl substances), which have raised environmental and health concerns because they break down very slowly in nature.
Quick decision guide
Useful, but context matters
Ammonium C6-16 Perfluoroalkylethyl 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Ammonium C6-16 Perfluoroalkylethyl Phosphate.
- 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 ammonium salt of a phosphate ester containing a perfluoroalkyl chain (6 to 16 carbons). It is part of the PFAS family, engineered to provide strong water and oil repellency.
How it works
When applied, the molecule arranges itself so the fluorinated tail points outward, creating a low-surface-energy barrier. This barrier prevents water and oil from wetting the skin or makeup, making the product more resistant to sweat, humidity, and sebum.
Pros
Strong water resistance
Keeps sunscreen and makeup effective during swimming, sweating, or high humidity, reducing the need for frequent reapplication.
Oil repellency
Helps control shine and prevents makeup from breaking down due to natural skin oils, which is especially helpful for oily skin types.
Cons and cautions
Environmental persistence
As a PFAS compound, it does not break down easily in the environment and can accumulate in water and soil, raising ecological concerns.
Potential bioaccumulation
Some PFAS chemicals can build up in the human body over time; while this specific ingredient is less studied, it shares structural similarities with more concerning PFAS.
Best for
- People who need long-lasting, water-resistant makeup or sunscreen
- Those with oily skin who want sebum-resistant formulas
Use caution if
- Individuals concerned about PFAS exposure or environmental impact
- Those with very sensitive or reactive skin (though irritation risk is low)
Usage tips
Safety summary
Generally considered safe for topical use at low concentrations, but long-term safety data is limited. The main concern is environmental persistence and potential for bioaccumulation, rather than acute skin irritation.
Research notes
Studies on this specific compound are sparse, but research on similar PFAS indicates low acute toxicity but potential for accumulation. More research is needed on chronic exposure through cosmetics.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics in the US and EU, but under increasing scrutiny. The EU is considering stricter limits on PFAS in cosmetics, and some US states have proposed bans.
- Common uses
- Waterproof sunscreens, Long-wear foundations, Water-resistant mascaras
- Environmental note
- Perfluoroalkyl compounds are highly persistent in the environment and can contaminate water sources. Their production and disposal raise significant ecological concerns.
Good to know
- This ingredient is often found in waterproof sunscreens and long-wear makeup, not in everyday moisturizers or serums.
- Regulatory bodies like the EU are increasingly restricting PFAS in cosmetics, so this ingredient may become less common in the future.
Common questions
What is Ammonium C6-16 Perfluoroalkylethyl Phosphate in beauty products?
This is a man-made chemical that helps cosmetics stay put even when you sweat or go swimming. It works by forming a thin, invisible film on your skin that repels both water and oil. Think of it like a raincoat for your makeup. However, it belongs to a family of chemicals called PFAS (per- and polyfluoroalkyl substances), which have raised environmental and health concerns because they break down very slowly in nature.
What does Ammonium C6-16 Perfluoroalkylethyl Phosphate do in a beauty product?
When applied, the molecule arranges itself so the fluorinated tail points outward, creating a low-surface-energy barrier. This barrier prevents water and oil from wetting the skin or makeup, making the product more resistant to sweat, humidity, and sebum.
Is Ammonium C6-16 Perfluoroalkylethyl Phosphate safe for most people?
Generally considered safe for topical use at low concentrations, but long-term safety data is limited. The main concern is environmental persistence and potential for bioaccumulation, rather than acute skin irritation.
Who should be careful with Ammonium C6-16 Perfluoroalkylethyl Phosphate?
Individuals concerned about PFAS exposure or environmental impact Those with very sensitive or reactive skin (though irritation risk is low)
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.