A lightweight, high-performance hydrocarbon emollient and solvent that provides a “dry-touch” finish and superior spreadability. Often utilized as a sustainable, biodegradable alternative to volatile silicones, it enhances product texture without leaving a greasy residue.
- INCI Name:
- C9-12 Alkane
- Chemical/Scientific Name:
- Alkanes, C9-12; Saturated aliphatic hydrocarbons
- Common Aliases:
- C9-12 Isoparaffin (related), Vegelight, Alkanes C9-C12
| Category: | Softeners |
| Source Origin: | Synthetic or Plant-derived (often Coconut or Palm) |
| Comedogenic Rating: | 0–1 |
| Primary Industries: | Skincare, Color Cosmetics, Haircare |
| Solubility: | Lipophilic (Oil-soluble) |
At a Glance: Properties & Effects
| Texture Enhancement | |
| Hydration/Moisture | |
| Soothing/Calming | |
| Irritation Risk |
Primary Benefits:
- Improves the “slip” and spreadability of thick or heavy formulations.
- Provides a silky, matte finish similar to cyclopentasiloxane.
- Acts as an efficient solvent for sun filters and pigments.
- Reduces the heavy feel of oils like coconut-oil in leave-on products.
Potential Risks:
- May cause mild dryness in rare cases if used in very high concentrations without humectants.
- Provides minimal biological “activity” compared to lipids like squalane.
Biological Action & Cosmetic Profile
C9-12 Alkane functions primarily as a volatile emollient, meaning it evaporates at skin temperature shortly after application. This physical property allows it to deliver active ingredients across the skin surface smoothly before disappearing, leaving behind a weightless, non-greasy film. Unlike traditional heavy oils, these saturated hydrocarbons fill the gaps between desquamating skin cells to provide immediate smoothing without the risk of occluding pores or inducing comedogenesis.Formulators frequently deploy this ingredient to modify the sensory profile of a product. When combined with heavier emollients like caprylic-capric-triglyceride, it thins the overall consistency, facilitating a faster absorption rate. In color cosmetics, it serves as a vehicle for pigments, ensuring even distribution and preventing the “streaking” often associated with high-viscosity foundations.Environmental considerations have increased its popularity as a 1-to-1 replacement for cyclic silicones. While silicones like cyclopentasiloxane face increasing regulatory scrutiny due to bioaccumulation concerns, plant-derived alkanes are readily biodegradable. These molecules mimic the refractive index and low surface tension of silicones, providing the same “luxury” feel while adhering to “clean” beauty standards.
Broader Applications & Origins
While often synthetic, modern manufacturing frequently derives C9-12 Alkane from vegetable fatty acids. This bio-based version is a staple in natural skincare lines that seek to avoid traditional petro-chemicals while maintaining professional-grade textures. In haircare, it acts as a lightweight conditioner that adds shine and reduces frizz without weighing down fine hair strands.
Routine Integration
Synergies:
- Works excellently with disteardimonium-hectorite to create stable, elegant gels.
- Enhances the skin-feel of heavy sunscreens containing zinc-oxide or titanium-dioxide.
- Pairs well with dimethicone to create a multi-stage evaporation profile for long-wear makeup.
Conflicts:
- No known biochemical conflicts; safe for use with all active ingredients.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated the safety of alkanes as used in cosmetics and determined them to be safe under current practices of use. Dermatological assessments confirm that C9-12 Alkane is non-sensitizing and non-irritating, making it suitable for sensitive skin types. Because these molecules are chemically inert, they do not react with the skin’s biological processes or disrupt the acid mantle.
Is C9-12 Alkane a silicone?
No, it is a hydrocarbon. While it mimics the sensory properties of volatile silicones like isododecane or cyclopentasiloxane, it belongs to a different chemical class and is often plant-derived.
Will this ingredient cause acne?
This ingredient is considered non-comedogenic. Its low viscosity and volatile nature prevent it from clogging pores, making it a safe choice for oily and acne-prone skin types.
Is C9-12 Alkane natural?
It can be. Many versions used in modern skincare are derived from coconut or palm oil via green chemistry processes, though purely synthetic versions also exist.