Polyglyceryl-6 Polyricinoleate serves as a high-performance, non-ionic emulsifier specifically designed for water-in-oil (W/O) systems. It is particularly valued for its ability to stabilize formulations with high water content while maintaining a light, non-greasy skin feel.
- INCI Name:
- Polyglyceryl-6 Polyricinoleate
- Chemical/Scientific Name:
- 1,2,3-Propanetriol, homopolymer, (9Z,12R)-12-hydroxy-9-octadecenoate
- Common Aliases:
- Hexaglyceryl Polyricinoleate, PGPR
| Category: | Emulsifiers |
| Source Origin: | Vegetable-derived (Castor Oil and Glycerin) |
| Comedogenic Rating: | 0–1 |
| Primary Industries: | Cosmetics, Food, Pharmaceuticals |
| Solubility: | Oil-soluble |
At a Glance: Properties & Effects
| Formula Stability: | |
| Texture Enhancement: | |
| Barrier Support: | |
| Irritation Risk: |
- Primary Benefits:
- Ensures long-term stability of water-in-oil emulsions, preventing phase separation.
- Facilitates the even distribution of mineral pigments like Zinc Oxide.
- Provides a smooth, emollient finish without the typical heaviness of traditional oils.
- Enhances the water resistance of sunscreens and protective barrier creams.
- Potential Risks:
- Minimal risk of contact dermatitis in extremely sensitive individuals.
- Incompatibility with certain high-HLB surfactants in complex multi-phase systems.
Biological Action & Cosmetic Profile
The molecular architecture of this ingredient allows it to function as a powerful surfactant with a low Hydrophilic-Lipophilic Balance (HLB) value, typically ranging between 3 and 5. By situating itself at the interface of water droplets and a continuous oil phase, the polyglycerol moiety interacts with water while the polyricinoleic chains anchor firmly into the oil. This structural arrangement significantly lowers interfacial tension, allowing for the creation of very fine droplets that resist coalescence.
Formulators frequently utilize this polymeric emulsifier to create “High Internal Phase Emulsions” (HIPE). These specific structures can contain up to 80% water within an oil external phase, resulting in a product that provides the intense hydration of Glycerin and water but maintains the protective, occlusive properties of a lipid barrier. This dual functionality is essential for treating compromised skin barriers and chronic dryness.
Pigment dispersion is another critical area of performance. The long-chain fatty acids derived from Ricinus Communis Seed Oil help coat physical UV filters like Titanium Dioxide. By preventing these particles from clumping, the emulsifier ensures uniform sun protection and reduces the “white cast” often associated with mineral sunscreens.
Broader Applications & Origins
Derivation begins with the esterification of polyglycerol with condensed castor oil fatty acids. While its cosmetic utility is extensive, the ingredient is also widely used in the food industry under the designation E476. In food science, it is primarily employed to improve the flow characteristics of chocolate by reducing the friction between cocoa particles and sugar, a testament to its exceptional lubricating properties.
Sustainability profiles for this ingredient are generally favorable. Being plant-based and biodegradable, it serves as an effective alternative to silicone-based emulsifiers for brands seeking “clean” or “green” certifications. Its robust nature often allows chemists to reduce the total concentration of emulsifiers needed, further minimizing the potential for skin irritation.
Routine Integration
- Synergies:
- Magnesium Sulfate: Works as a co-stabilizer to reinforce the ionic strength of the water phase in W/O emulsions.
- Caprylic/capric Triglyceride: Provides a lightweight oil base that complements the emulsifier’s spreading capabilities.
- Mineral Filters: Optimizes the suspension of Zinc Oxide for superior SPF coverage.
- Conflicts:
- Highly hydrophilic (high HLB) surfactants like Polysorbate 80 may destabilize the specific water-in-oil structure if not carefully balanced.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated the safety of polyglyceryl fatty acid esters and concluded they are safe for use in cosmetics. Clinical studies indicate that the ingredient is non-sensitizing and non-irritating even at concentrations higher than those typically found in retail skincare. Because of its high molecular weight, it does not penetrate the viable layers of the epidermis, remaining on the surface to perform its functional role without interfering with cellular metabolism.
Is Polyglyceryl-6 Polyricinoleate the same as a silicone?
No, this is a vegetable-derived ester made from castor oil and glycerin. While it can mimic some of the smooth, spreadable properties of silicones, it is a completely different chemical class and is often used in silicone-free formulations.
Will this ingredient cause breakouts?
This ingredient has a very low comedogenic potential. Because it is used to stabilize water-in-oil emulsions, the overall formulation might feel “richer” than a standard lotion, but the ingredient itself is not known to clog pores or trigger acne.
Why is it used in “waterproof” products?
Since it creates a water-in-oil emulsion, the external layer of the product is oil-based. This naturally repels water and sweat, making it an ideal choice for long-wear foundations and high-performance sports sunscreens.