What Is Behenylcarbamoylpropyl Polysilsesquioxane?
Behenylcarbamoylpropyl Polysilsesquioxane is a silicone-based polymer created by linking silsesquioxane cages with a behenyl-derived carbamoylpropyl side chain. The behenyl part comes from behenic acid, a fatty acid typically sourced from rapeseed or peanut oil, while the silsesquioxane backbone is built from silica-rich raw materials. First developed in the early 2000s as chemists searched for lightweight texturizers that combine the silky feel of silicones with the cushion of long-chain lipids, it soon found a place in skin care and makeup formulas. Production involves hydrolyzing and condensing trialkoxysilanes to form the silsesquioxane core, then grafting the behenylcarbamoylpropyl group onto the ends, leaving hydroxyl “handles” that help the polymer disperse evenly in creams and powders. Today it appears in moisturizers, primers, foundations, solid balms, sunscreens and hair styling products where a soft, velvety finish is desired.
Behenylcarbamoylpropyl Polysilsesquioxane’s Cosmetic Benefits/Uses
This ingredient serves a single purpose in cosmetic formulas.
As a bulking agent it adds desirable body without heaviness, allowing creams to feel rich yet spread easily, powders to press firmly without crumbling and solid sticks to glide smoothly across skin or hair.
Who Can Use Behenylcarbamoylpropyl Polysilsesquioxane
This polymer is considered suitable for all skin types, including oily, dry, combination and sensitive skin, because it sits on the surface and does not draw or lock in water the way some heavier silicones do. It feels lightweight so it is unlikely to overwhelm oily or acne-prone complexions, yet the velvety finish can soften rough or flaky areas on dry skin. People with very sensitive or allergy-prone skin can generally tolerate it, though they should be mindful of the other ingredients blended with it.
The behenyl chain is normally sourced from plant oils such as rapeseed or peanut, making the finished ingredient vegan and vegetarian friendly. Brands that certify their supply chain can state this clearly on the label, so anyone avoiding animal-derived raw materials should double-check product claims to be certain.
No data shows that Behenylcarbamoylpropyl Polysilsesquioxane is absorbed through the skin in meaningful amounts, so it is viewed as low risk for pregnant or breastfeeding women. This is not medical advice and those who are expecting or nursing should run any skincare product past a qualified doctor before use.
The ingredient does not make skin more sensitive to sunlight and it has no known interactions with UV filters, self-tanners or exfoliating acids. It is also odorless and free of natural fragrance compounds, so it does not contribute to photosensitivity caused by scent allergens.
Potential Side Effects/Adverse Reactions
Responses to topical Behenylcarbamoylpropyl Polysilsesquioxane vary from person to person. The points below outline potential issues but they remain uncommon when the ingredient is formulated and used correctly.
- Mild skin irritation such as redness or itching in highly sensitive individuals
- Rare allergic contact dermatitis if someone is specifically sensitized to silicones or fatty alcohol derivatives
- Temporary clogged pores or breakouts in those who react to any film-forming agent
- Eye discomfort or watering if loose powder containing the polymer is inhaled or gets into the eyes
- Build-up on hair strands leading to dullness if used frequently without a clarifying shampoo
If you notice any unwanted reaction stop using the product immediately and seek advice from a healthcare professional or dermatologist.
Comedogenic Rating
Rating: 1/5
Behenylcarbamoylpropyl Polysilsesquioxane is a large, surface-sitting polymer that does not sink deeply into pores. Its silicone backbone makes it breathable while the long behenyl chain gives slip without leaving a greasy residue, so it has a very low tendency to clog pores. People who break out easily can generally use it without trouble, though overall formula and individual skin chemistry always matter.
Keep in mind that heavy use of any film-forming ingredient alongside rich oils or waxes may raise the clogging risk, so look at the full ingredient list if you are particularly acne-prone.
Summary
Behenylcarbamoylpropyl Polysilsesquioxane is mainly a bulking agent that builds cushion and body in creams, powders and sticks. Its silicone cage spreads smoothly while the fatty side chain adds a silky feel, helping products press well, glide easily and leave a soft finish.
It is not a headline ingredient like hyaluronic acid or niacinamide, but formulators appreciate its texture-boosting talent so you will spot it in a growing number of moisturizers, primers and solid balms.
Safety data show it stays on the skin surface, is rarely irritating and has a very low comedogenic rating, making it suitable for most users. As with any new product do a quick patch test to make sure your skin agrees.