What Is Perfluorononylethyl Carboxydecyl Behenyl Dimethicone?
Perfluorononylethyl Carboxydecyl Behenyl Dimethicone is a specialty silicone that has been modified with a short chain of fluorinated carbon atoms. This tweak gives the ingredient a light silky feel and water-repelling properties that standard silicones do not have. It starts with a base of dimethicone, one of the most common cosmetic silicones, which is reacted with fluoroalkyl alcohols and fatty acid chains in carefully controlled steps. The result is a hybrid molecule that marries the glide of silicones with the durability of fluorocarbons.
Brands first explored these fluorinated silicones in the early 2000s when they were looking for ways to make makeup and skincare last longer without heavy waxes. Today formulators value Perfluorononylethyl Carboxydecyl Behenyl Dimethicone for its weightless feel and its ability to create a flexible film on the surface of skin.
You will most often see it in long-wear foundations, primers, setting sprays, high-performance sunscreens, anti-aging serums, sheet masks and hair-smoothing serums. It is added in low percentages so it never feels greasy yet still boosts the staying power of the rest of the formula.
Perfluorononylethyl Carboxydecyl Behenyl Dimethicone’s Cosmetic Benefits/Uses
This ingredient serves one key role in personal care products.
Skin conditioning: It forms a thin breathable layer that smooths rough patches, fills in fine lines and gives skin an instant soft touch finish. Because the layer resists water and oil, makeup applied on top stays put longer and moisturizers underneath are less likely to evaporate, which helps skin feel hydrated throughout the day.
Who Can Use Perfluorononylethyl Carboxydecyl Behenyl Dimethicone
Because it is light and non-greasy this fluorinated silicone works well for nearly all skin types. Oily and combination skin appreciate the weightless feel while the water-resistant film helps dry or mature skin hold on to moisture. Extremely acne-prone users who react poorly to any film-forming ingredient might want to monitor their skin closely but most people will not notice clogged pores.
The molecule is fully synthetic with no animal-derived raw materials so it is suitable for vegans and vegetarians.
Current safety assessments do not flag any concern for pregnant or breastfeeding women when the ingredient is used topically in standard cosmetic concentrations. That said this is not medical advice and anyone who is expecting or nursing should discuss all personal care products with a qualified physician to be safe.
Perfluorononylethyl Carboxydecyl Behenyl Dimethicone does not make skin more sensitive to sunlight and has no known interactions with common sunscreen filters or antioxidants.
Potential Side Effects/Adverse Reactions
Responses to any cosmetic ingredient differ from person to person. The issues listed below are possible yet uncommon when the product is formulated and used as directed.
- Mild transient redness or itching – very rare but can occur in individuals with a silicone sensitivity
- Temporary clogged pores or breakouts – more likely if the formula is heavy in oils or if skin is already congestion-prone
- Product buildup on the skin surface – can lead to a dull appearance if cleansing is insufficient
- Contact allergy – extremely rare but manifests as persistent rash or swelling that continues after repeated use
If any negative reaction develops stop using the product and consult a healthcare professional for personalized guidance.
Comedogenic Rating
Rating: 1 / 5
Perfluorononylethyl Carboxydecyl Behenyl Dimethicone is a large, inert silicone molecule that sits on the surface of skin and does not readily mix with sebum. Because it creates a breathable yet water resistant film instead of penetrating into pores, it is far less likely to trap oil or dead cells that spark breakouts. The addition of fluorinated and long chain fatty segments can raise the occlusive feel slightly, which is why it is not given a perfect zero, but clinical and anecdotal data show only a small percentage of acne prone users report congestion directly linked to this ingredient.
Most people who are prone to acne or breakouts can use products containing this silicone without issue.
Formulation matters: if the finished product also contains heavy waxes or comedogenic oils, the overall pore clogging potential can rise even if this specific ingredient remains low risk.
Summary
Perfluorononylethyl Carboxydecyl Behenyl Dimethicone is primarily a skin conditioning agent that smooths texture, blurs fine lines and helps lock in moisture by forming a lightweight protective film. Its fluorinated tail boosts water and oil resistance so makeup, sunscreen and active ingredients stay put longer while still feeling silky and flexible.
The ingredient enjoys modest popularity, showing up most in long wear foundations, high performance sunscreens and luxe serums rather than everyday lotions. Formulators value its performance benefits but its higher cost keeps it out of many mass market lines.
Current research finds it safe for topical use with very low irritation or sensitization reports. As with any new cosmetic we recommend patch testing to confirm personal compatibility before full face or body use.