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BEHENYLCARBAMOYLPROPYL POLYSILSESQUIOXANE.

Valuable CAS 1638330-84-3 / BULKING

A sophisticated, behenyl-modified silicone resin that creates a lightweight, breathable lattice over the skin's surface. This hybrid polymer provides a biomimetic shield that reinforces the lipid barrier while enhancing the structural integrity and application of anhydrous cosmetic formulations.

film-forming skin-protecting pigment-coating viscosity-controlling

Science

This three-dimensional polymer utilizes a C22 fatty chain and a carbamate linkage to mimic the skin's natural lipid architecture, allowing it to integrate seamlessly with the moisture barrier. It forms a flexible, non-occlusive film that acts as a physical 'shield' against environmental pollutants and particulate matter, while simultaneously serving as a high-performance surface treatment that ensures pigments adhere uniformly and remain color-true.


Research

Medium confidence
Effective range 0.1–5%
Optimal

1%

Key findings

  1. 01 Demonstrated efficacy as a biomimetic anti-pollution barrier and hydration-locking agent, significantly improving pigment adhesion and weightless protection in premium color-skincare hybrids.

Transparency

Not commonly dusted
Min. effective
0.1%
Red flag below
0.05%

Because it is highly effective at concentrations as low as 0.1% for pigment treatment and film-forming, 'dusting' is rare; however, levels below 0.1% are unlikely to provide the advertised anti-pollution or barrier-reinforcement benefits.


The Formula

Solubility
Oil
Optimal pH 4 – 8
0 7 14

Stability

Highly stable in waterless (anhydrous) systems. It is particularly effective in stick formats where it raises the melting point and increases structural hardness without compromising smooth application slip.

Synergies

  • Mineral pigments
  • Squalane
  • Ceramides

Conflicts

  • Highly polar water-based systems
  • Water-clear aqueous gels

Safety

CIR Status
Safe as used
Max tested
55.2%
Pregnancy
Safe
Sensitization risk Low

The Cosmetic Ingredient Review (CIR) confirmed this structural group is non-genotoxic and non-sensitizing even at high concentrations. While the category is safe up to 55.2%, this specific behenyl-modified version is typically utilized below 5%.


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Valuable

An elite film-former and barrier enhancer that provides a breathable, anti-pollution shield and superior pigment performance in precision skincare-makeup hybrids.


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