Ingredient review

Behenylcarbamoylpropyl Polysilsesquioxane

INCI: BEHENYLCARBAMOYLPROPYL POLYSILSESQUIOXANE

A silicone polymer that creates a flexible, water-resistant film on skin for smoother texture and longer wear.

beautyskincarefilm-former

In plain English

This is a man-made silicone ingredient that forms a thin, breathable film on your skin. It helps makeup stay put longer, makes products feel silky, and can help sunscreen resist water. Think of it like a very lightweight, invisible shield that doesn't clog pores.

Quick decision guide

Useful, but context matters

Behenylcarbamoylpropyl Polysilsesquioxane 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Behenylcarbamoylpropyl Polysilsesquioxane.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A hybrid silicone polymer with a behenyl (long-chain fatty) group attached. It is a type of polysilsesquioxane, meaning it has a silica-like backbone with organic side chains, giving it both film-forming and water-repelling properties.

How it works

When applied, the ingredient's molecules link together as the solvent (water or oil) evaporates, forming a continuous, flexible film on the skin. This film physically blocks water and sweat, helps other ingredients stay in place, and gives a smooth, non-tacky feel.

Pros

Long-lasting wear

Forms a flexible film that helps makeup and sunscreen stay put for hours, even in humidity or water.

Smooth texture

Gives a silky, non-greasy feel that helps products glide on and reduces the need for talc or powders.

Cons and cautions

Removal difficulty

Because it's water-resistant, you may need an oil-based cleanser or micellar water to fully remove it, which can be an extra step.

Synthetic origin

It is a man-made silicone, which some people prefer to avoid for environmental or personal preference reasons.

Best for

  • Anyone wanting long-lasting makeup or water-resistant sunscreen
  • People with oily or combination skin who prefer a matte finish

Use caution if

  • Those who prefer silicone-free or minimalist skincare routines

Usage tips

Use a double-cleansing method (oil cleanser followed by water-based cleanser) to fully remove products containing this ingredient.
Apply a thin layer of primer or foundation containing this ingredient for best film formation and wear.
Avoid layering too many silicone-heavy products to prevent a heavy or tight feeling.

Safety summary

Behenylcarbamoylpropyl Polysilsesquioxane is considered safe for use in cosmetics at typical concentrations. It is not a skin irritant, sensitizer, or comedogen. The Cosmetic Ingredient Review (CIR) panel has reviewed similar silicone polymers and found them safe as used.

Research notes

Most evidence comes from formulation science and safety assessments rather than clinical efficacy studies. It is well-documented as a film former and water-resistance enhancer. No peer-reviewed studies specifically on this exact ingredient were found, but it is structurally similar to other safe polysilsesquioxanes.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics globally, including by the FDA (US) and EU CosIng database. No known restrictions.
Common uses
Foundations, Primers, Sunscreens, Long-wear makeup, Water-resistant formulas
Environmental note
As a silicone polymer, it may not be biodegradable. However, its large molecular size limits absorption into skin or the environment. Some brands are moving toward bio-based alternatives.

Good to know

  • This ingredient is often used in 'transfer-proof' or '24-hour wear' makeup claims.
  • It is considered non-comedogenic and safe for most skin types, including sensitive skin.
  • The behenyl group helps it blend well with oils and other silicones.

Common questions

What is Behenylcarbamoylpropyl Polysilsesquioxane in beauty products?

This is a man-made silicone ingredient that forms a thin, breathable film on your skin. It helps makeup stay put longer, makes products feel silky, and can help sunscreen resist water. Think of it like a very lightweight, invisible shield that doesn't clog pores.

What does Behenylcarbamoylpropyl Polysilsesquioxane do in a beauty product?

When applied, the ingredient's molecules link together as the solvent (water or oil) evaporates, forming a continuous, flexible film on the skin. This film physically blocks water and sweat, helps other ingredients stay in place, and gives a smooth, non-tacky feel.

Is Behenylcarbamoylpropyl Polysilsesquioxane safe for most people?

Behenylcarbamoylpropyl Polysilsesquioxane is considered safe for use in cosmetics at typical concentrations. It is not a skin irritant, sensitizer, or comedogen. The Cosmetic Ingredient Review (CIR) panel has reviewed similar silicone polymers and found them safe as used.

Who should be careful with Behenylcarbamoylpropyl Polysilsesquioxane?

Those who prefer silicone-free or minimalist skincare routines

Research sources

Cosmetic Ingredient Review (CIR) – Safety of Silicone PolymersOpenEU CosIng Database – Behenylcarbamoylpropyl PolysilsesquioxaneOpenPubMed – Silicone Polymers in CosmeticsOpen

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.