Polyglyceryl-2 Diisostearate/Polyhydroxystearate/Sebacate is a high-performance, PEG-free emulsifier engineered for stable water-in-oil (W/O) systems. It enables the formulation of lightweight, aesthetically pleasing emulsions with high water content while reinforcing the skin’s moisture barrier.
- INCI Name:
- Polyglyceryl-2 Diisostearate/Polyhydroxystearate/Sebacate
- Chemical/Scientific Name:
- Ester of polyglycerin-2 with isostearic acid, polyhydroxystearic acid, and sebacic acid.
- Common Aliases:
- Isolan GPS, Polyglyceryl-2 complex ester.
| Category: | Emulsifiers |
| Source Origin: | Vegetable-derived (typically from palm, rapeseed, or castor oil) |
| Comedogenic Rating: | 0–1 |
| Primary Industries: | Cosmetics, Sun Care, Baby Care, Dermatological Ointments |
| Solubility: | Oil-soluble |
At a Glance: Properties & Effects
| Formula Stability | |
| Texture Enhancement | |
| Barrier Repair | |
| Irritation Risk |
Primary Benefits:
- Facilitates the creation of stable water-in-oil emulsions with a low-viscosity, non-greasy skin feel.
- Supports cold-process manufacturing, preserving the integrity of heat-sensitive active ingredients.
- Improves the distribution and skin-adhesion of mineral UV filters like Zinc Oxide.
- Provides long-lasting hydration by forming a breathable, protective film over the stratum corneum.
Potential Risks:
- Negligible risk of irritation; however, individuals with extremely reactive skin should patch test complex esters.
- May feel slightly heavy if used at excessively high concentrations in oily skin formulations.
Biological Action & Cosmetic Profile
Molecular architecture defines the functionality of this complex ester. By combining Glycerin polymers with various fatty acids, chemists created a molecule with a unique “cross-linked” structure. This geometry allows it to sit at the interface of oil and water droplets more effectively than traditional emulsifiers. Because it creates a robust interfacial film, it prevents the water droplets in an emulsion from coalescing, which is the primary cause of product separation.In cosmetic chemistry, the ingredient is prized for its ability to stabilize systems containing up to 80% water within an oil continuous phase. This is historically difficult to achieve without creating a thick, “draggy” cream. By utilizing this polyglyceryl ester, formulators can produce fluid lotions that offer the intensive protection of an oil-based product with the refreshing application of a water-based one.Stability remains the primary technological advantage. The molecule maintains its structural integrity across a wide temperature range and varying pH levels. This resilience makes it indispensable for products stored in fluctuating environments, such as sunscreens kept in hot vehicles or beach bags.
Broader Applications & Origins
Derived primarily from vegetable sources, this ingredient serves as a sustainable alternative to polyethylene glycol (PEG) based emulsifiers. Its plant-based origin appeals to the “clean beauty” sector, though its inclusion is driven more by technical merit than marketing trends. Beyond simple moisturizers, it is a staple in high-performance color cosmetics, where it helps suspend pigments like Iron Oxides evenly across the skin.Sunscreens utilize this ester to enhance water resistance. By ensuring that Titanium Dioxide remains evenly dispersed within the oil phase, the ingredient helps prevent the “clumping” of minerals that leads to uneven UV protection. It also contributes to the “soft-focus” effect often desired in primers and foundations.
Routine Integration
Synergies:
- Combines exceptionally well with electrolytes like Magnesium Sulfate to further stabilize the internal water phase of emulsions.
- Works harmoniously with emollients such as Squalane or Caprylic Capric Triglyceride to optimize spreadability.
- Enhances the efficacy of moisture-locking agents like Petrolatum by improving their cosmetic elegance.
Conflicts:
- No known chemical conflicts with common active ingredients like Retinol or Niacinamide.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel and the European Commission’s CosIng database classify polyglyceryl esters as safe for use in cosmetics. Because of the large molecular weight of this specific complex ester, it does not penetrate the skin barrier to enter the bloodstream, residing instead on the surface where it performs its barrier-support functions. Clinical patch testing consistently demonstrates a lack of sensitizing or photo-toxic potential, making it a preferred choice for baby care and eczema-prone skin formulations.
Is Polyglyceryl-2 Diisostearate/Polyhydroxystearate/Sebacate natural?
While the starting materials (glycerin and fatty acids) are typically derived from natural vegetable oils, the final ingredient is a result of laboratory synthesis to ensure purity and specific performance characteristics. It is widely accepted in many “natural” and “green” certification standards as a PEG-free alternative.
Will this ingredient clog my pores?
With a comedogenic rating of 0 to 1, this ingredient is considered non-comedogenic for the vast majority of users. Its ability to create lightweight emulsions means it is less likely to feel “suffocating” on the skin compared to older water-in-oil emulsifiers.
Why is it used in sunscreens?
It is used because it provides excellent “wetting” properties for mineral powders. This ensures that sun-blocking particles are distributed in a thin, uniform layer, which maximizes UV protection and minimizes the white cast often associated with physical blocks.