Polysilicone-11 is a high-performance crosslinked silicone elastomer that creates a luxurious, powdery finish and provides an instant blurring effect on fine lines and pores. It is prized for its ability to mattify the skin without causing dryness or clogging pores.
- INCI Name:
- Polysilicone-11
- Chemical/Scientific Name:
- Crosslinked dimethylsiloxane; reaction product of bis-vinyldimethicone and hydrogen dimethicone
- Common Aliases:
- Silicone Elastomer, Polysilicone-11 Elastomer Blend
| Category: | Texture Enhancers |
| Source Origin: | Synthetic |
| Comedogenic Rating: | 0 |
| Primary Industries: | Skincare, Color Cosmetics, Sun Protection |
| Solubility: | Oil-dispersible (Silicones and Hydrocarbons) |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Sebum Control: | |
| Irritation Risk: | |
| Barrier Repair: |
Primary Benefits:
- Provides an immediate soft-focus, blurring effect on skin texture and imperfections.
- Delivers a non-greasy, silky, and powdery skin feel.
- Absorbs excess surface oils to maintain a matte finish throughout the day.
- Improves the spreadability and application experience of heavy or oily formulations.
Potential Risks:
- May lead to product pilling if used in excessive amounts or over incompatible water-based serums.
- Requires oil-based or thorough double-cleansing to ensure complete removal from the skin.
Biological Action & Cosmetic Profile
The structural complexity of this ingredient stems from its crosslinked 3D matrix. Unlike linear silicones such as Dimethicone, which spread into thin, liquid films, Polysilicone-11 forms a flexible elastomer network. This mesh-like architecture allows it to trap liquid carriers—like Cyclopentasiloxane or Isododecane—within its pores, resulting in a “cushion” effect upon application. Because its molecular weight often exceeds one million Daltons, the polymer is physically incapable of penetrating the skin barrier, ensuring it remains entirely on the surface to perform its aesthetic functions.
Optical diffusion is a hallmark characteristic of this elastomer. As light hits the skin, the spherical and irregular surfaces of the polymer particles scatter the light in multiple directions. This light interference minimizes the visual contrast of shadows created by pores and wrinkles, effectively “erasing” their appearance temporarily. This mechanism is frequently enhanced when combined with mineral powders like Silica or polymers like Nylon 12.
Functional versatility allows this ingredient to act as a stabilizing agent within emulsions. By increasing the viscosity of the oil phase, it prevents the coalescence of droplets, leading to a more stable and shelf-resilient product. Furthermore, its inert nature makes it an ideal delivery vehicle for sensitive actives, as it creates a breathable film that can mitigate the initial irritation of potent ingredients while providing a smooth canvas for further product layers.
Broader Applications & Origins
Cosmetic chemists frequently utilize this polymer in high-end primers and “blurring” creams to bridge the gap between skincare and makeup. In sun protection products, it serves a critical role in mitigating the greasy residue often associated with high-SPF chemical filters. By absorbing surface sebum and providing a dry-touch finish, it improves consumer compliance for daily sunscreen use. While entirely synthetic in origin, the material is derived from silicon (sourced from sand) and undergoes organic synthesis to achieve its specific elastomeric properties.
Routine Integration
Synergies:
- Dimethicone: Often paired to create a “velvet” texture and improve long-term skin hydration.
- Cyclopentasiloxane: Acts as a volatile carrier that evaporates, leaving the elastomer behind for a matte, powdery finish.
- Polymethylsilsesquioxane: Enhances the light-scattering effect for superior blurring performance.
- Vinyl Dimethicone: Frequently used in conjunction to fine-tune the elasticity and “stretch” of the cosmetic film.
Clinical Consensus & Safety
Dermatological safety assessments by the Cosmetic Ingredient Review (CIR) Expert Panel have concluded that Polysilicone-11 is safe for use in cosmetic products at current practice levels, which can range from 0.05% to nearly 20%. Because of its massive molecular size and chemical inertness, it does not provoke immune responses or cause sensitization. Clinical patch tests consistently show no signs of irritation, and its non-comedogenic nature makes it suitable for acne-prone skin, provided the final formulation is well-balanced.
Does Polysilicone-11 clog pores or cause acne?
No. Despite common myths regarding silicones “suffocating” the skin, Polysilicone-11 forms a breathable, mesh-like film. Its molecules are too large to enter the pore, and it does not possess the chemical properties associated with comedogenicity.
Is Polysilicone-11 a microplastic?
Under current regulatory definitions in many jurisdictions, including the EU, silicone elastomers like Polysilicone-11 are distinct from the traditional “microplastics” targeted by bans. They are liquid or gel-like polymers rather than solid, non-degradable plastic beads.
Why does my product pill when it contains this ingredient?
Pilling usually occurs if the elastomer is applied over a heavy water-based serum that hasn’t fully absorbed. To prevent this, allow previous layers to dry completely, or pat the product onto the skin instead of rubbing vigorously.