Polyglyceryl-10 Diisostearate is a high-performance, non-ionic emulsifier and skin-conditioning agent derived from Glycerin and fatty acids. It excels at stabilizing complex oil-in-water and water-in-oil formulations while providing a luxurious, non-greasy skin feel. This versatile ingredient is particularly prized in cleansing oils and balms for its ability to rinse away impurities without disrupting the skin barrier.
- INCI Name:
- Polyglyceryl-10 Diisostearate
- Chemical/Scientific Name:
- 1,2,3-Propanetriol, homopolymer, diisooctadecanoate (average 10 units of Glycerin)
- Common Aliases:
- Decaglyceryl Diisostearate, PG-10 Diisostearate
| Category: | Emulsifiers |
| Source Origin: | Synthetic or Plant-derived (typically from vegetable oils) |
| Comedogenic Rating: | 1 |
| Primary Industries: | Cosmetics, Dermatology, Personal Care |
| Solubility: | Oil-soluble / Dispersible |
At a Glance: Properties & Effects
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- Primary Benefits: Stabilizes heterogeneous mixtures, improves product spreadability, provides gentle emolliency, and facilitates the emulsification of sebum and makeup.
- Potential Risks: Extremely low; generally considered non-sensitizing and non-irritating for most skin types.
Biological Action & Cosmetic Profile
The molecular architecture of this ester consists of a large hydrophilic head formed by ten polymerized Glycerin units and two lipophilic tails of Isostearic Acid. Because of this amphiphilic nature, the molecule sits at the interface of oil and water phases, reducing surface tension and preventing the droplets from coalescing. This stabilization is vital for maintaining the shelf-life and aesthetic consistency of high-lipid creams and lotions.Beyond its mechanical role as an emulsifier, the compound serves as an effective emollient. The Isostearic Acid chains integrate into the lipid matrix of the stratum corneum, smoothing the skin surface and reducing transepidermal water loss (TEWL). In rinse-off products like cleansing balms, it allows oils to transform into a milky emulsion upon contact with water, ensuring that heavy sunscreens and pigments are removed without leaving a heavy residue.
Broader Applications & Origins
Formulators frequently select this specific polyglyceryl ester when developing “PEG-free” or “natural” skincare lines. Its origin is often botanical, utilizing fatty acids derived from rapeseed or sunflower oils. Unlike traditional ethoxylated surfactants, polyglyceryl esters are biodegradable and generally perceived as milder alternatives for sensitive or reactive skin.
Routine Integration
- Synergies: Works exceptionally well with other lipid-replenishing agents like Caprylic Capric Triglyceride and Butyrospermum Parkii Butter to create rich barrier creams. It also stabilizes formulas containing Dimethicone or plant oils like Simmondsia Chinensis Seed Oil.
- Conflicts: There are no known biochemical conflicts; it is compatible with a wide range of actives, including Allantoin, Propanediol, and Trehalose.
Clinical Consensus & Safety
The Cosmetic Ingredient Review (CIR) Expert Panel has evaluated polyglyceryl fatty acid esters extensively, concluding that they are safe for use in cosmetics at concentrations typical of current practice. Clinical data indicates an absence of dermal sensitization or significant irritation, even in formulations where these esters are the primary surfactant. Dermatologists often recommend products containing this ingredient for patients with dry or compromised skin because it provides cleansing and stabilization without the harshness associated with anionic sulfates.
Is Polyglyceryl-10 Diisostearate safe for acne-prone skin?
With a comedogenic rating of 1, this ingredient is highly unlikely to clog pores. It is generally considered a safe choice for oily and acne-prone skin types, especially when used in rinse-off cleansing oils.
Is this ingredient considered “natural”?
Many manufacturers derive the Glycerin and Isostearic Acid from vegetable sources. While it undergoes a chemical process (esterification) to be created, it is widely accepted in “clean” and PEG-free beauty standards.
Why is it often found in cleansing balms?
Its unique structure allows it to “grip” oils on the skin while remaining easily dispersible in water. This ensures that the product spreads easily as a solid balm but rinses off cleanly as a liquid milk.