This lightweight hydrocarbon emollient functions as a high-purity solvent and texture enhancer. It provides a non-greasy, “dry” skin feel and is frequently utilized as a biodegradable alternative to volatile silicones.
- INCI Name:
- C15-23 Alkane
- Chemical/Scientific Name:
- Alkanes, C15-23; Saturated branched and linear hydrocarbons
- Common Aliases:
- Isoparaffin mixture, Hydrogenated polydecene (related class), Emogreen (trade name blend)
| Category: | Softeners |
| Source Origin: | Synthetic or Mineral-based (often derived from vegetable biomass in “green” versions) |
| Comedogenic Rating: | 0-1 |
| Primary Industries: | Skincare, Color Cosmetics, Hair Care |
| Solubility: | Oil-soluble |
At a Glance: Properties & Effects
| Texture Enhancement: | |
| Hydration/Moisture: | |
| Spreadability: | |
| Irritation Risk: |
Primary Benefits:
- Improves the “slip” and application feel of heavy creams.
- Provides a silky, matte finish without the residue typical of traditional oils.
- Acts as an efficient solvent for UV filters and pigments.
- Reduces the perceived tackiness of humectants like Glycerin.
Potential Risks:
- Minimal risk of irritation; generally considered inert.
- Over-reliance in a formula may result in a “hollow” feel if not balanced with occlusives.
Biological Action & Cosmetic Profile
Hydrocarbons such as C15-23 Alkane are chemically inert molecules consisting entirely of carbon and hydrogen atoms. On the skin’s surface, these molecules occupy the interstitial spaces between corneocytes in the stratum corneum. By filling these microscopic gaps, the ingredient smooths the skin’s physical topography, which results in an immediate softening effect and improved light reflection.
The specific chain length of C15 to C23 provides a unique balance between volatility and persistence. Unlike Isododecane, which evaporates rapidly, this mixture remains on the skin long enough to provide emolliency while remaining significantly lighter than Mineral Oil. It forms a breathable, hydrophobic film that helps to limit transepidermal water loss (TEWL) without the heavy, suffocating sensation associated with long-chain petrolatum products.
Formulators often select this ingredient for its high polarity and compatibility with various cosmetic esters. Its ability to disperse pigments evenly makes it an essential component in fluid foundations and sunscreens. Furthermore, because it is highly stable against oxidation, it does not turn rancid over time, ensuring a longer shelf life for anhydrous (water-free) products compared to natural plant oils.
Broader Applications & Origins
While historically derived from petroleum refining, modern cosmetic science has pivoted toward “green” alkanes. Many C15-23 mixtures are now produced through the fermentation of plant sugars or the hydroprocessing of vegetable oils. This transition allows the ingredient to meet ECOCERT or COSMOS standards while maintaining the technical performance of traditional paraffins. In hair care, these alkanes are frequently used to provide shine and heat protection, serving as a functional substitute for Cyclopentasiloxane.
Routine Integration
Synergies:
- Humectants: Works excellently alongside Sodium Hyaluronate or Glycerin to seal in moisture.
- Silicones: Often blended with Dimethicone to create a sophisticated sensory profile with varying evaporation rates.
- UV Filters: Enhances the solubility of organic sunscreens like Avobenzone, preventing crystallization.
- Natural Oils: Helps thin out viscous oils like Butyrospermum Parkii Butter for better spreadability.
Conflicts:
- No known chemical conflicts; it is highly compatible with active substances like Retinol and Ascorbic Acid.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel and the European Chemicals Agency (ECHA) classify C15-23 alkanes as safe for use in cosmetics. Clinical patch testing consistently demonstrates that these hydrocarbons are non-sensitizing and non-irritating, even at high concentrations. Because they are chemically non-reactive, they are frequently recommended for sensitive skin formulations where botanical extracts or essential oils might cause adverse reactions. Research published in dermatological journals highlights that high-purity alkanes do not penetrate the viable layers of the skin, remaining safely within the stratum corneum or on the surface.
Is C15-23 Alkane a silicone?
No, it is a hydrocarbon. While it shares the “dry-touch” and smoothing properties of many silicones, it has a different chemical backbone and is often preferred in silicone-free or biodegradable formulations.
Will this ingredient clog my pores?
C15-23 Alkane has a very low comedogenic potential. Because of its thin consistency and high purity, it is unlikely to cause breakouts, making it suitable for oily and acne-prone skin types.
Is it considered “natural”?
It depends on the manufacturing process. While it can be derived from mineral sources, many suppliers now produce it from 100% renewable plant-based feedstocks, allowing it to be marketed as a natural-origin ingredient.