Polyglyceryl-2 Sesquioleate in Cosmetics: The Ultimate FAQ Guide for Formulators

2026-04-09

Polyglyceryl-2 Sesquioleate is a versatile, plant-derived ingredient gaining immense popularity in the clean beauty and personal care industry. Whether you are a cosmetic chemist or a brand owner, this FAQ provides essential technical insights into its applications and benefits.

1. What is Polyglyceryl-2 Sesquioleate?

Polyglyceryl-2 Sesquioleate (often abbreviated as PG2SO) is a partial ester of oleic acid and a glycerin polymer. It is a non-ionic, PEG-free surfactant and emulsifier typically derived from vegetable oils. Due to its excellent skin compatibility and mildness, it is a staple in natural cosmetic formulations.

2. What are the primary functions of Polyglyceryl-2 Sesquioleate in cosmetics?

Polyglyceryl-2 Sesquioleate is a multi-functional ingredient known for:

W/O Emulsifier: It acts as a powerful Water-in-Oil (W/O) emulsifier, creating stable, rich, and creamy textures.
Pigment Dispersant: It is widely used in color cosmetics (like foundations and lipsticks) to ensure even distribution of pigments and minerals.
Solubilizer: It helps integrate oil-soluble components into various systems.
Skin Conditioning: It provides a smooth, non-greasy emollient effect, improving the skin's moisture barrier.

3. Is Polyglyceryl-2 Sesquioleate PEG-free and Natural?

Yes. Polyglyceryl-2 Sesquioleate is 100% PEG-free (Polyethylene Glycol-free), making it an ideal choice for brands targeting the "Green Beauty" or "Clean Beauty" market. Most high-quality PG2SO is derived from renewable vegetable sources and is biodegradable.

4. What is the HLB value of Polyglyceryl-2 Sesquioleate?

Polyglyceryl-2 Sesquioleate typically has a low HLB (Hydrophilic-Lipophilic Balance) value, usually around 3.5 to 4.5. This low range makes it specifically effective for creating W/O emulsions and for dispersing hydrophobic pigments.

5. In which types of products is PG2SO most commonly used?

You will find Polyglyceryl-2 Sesquioleate in a wide array of products, including:

Sunscreens: To improve water resistance and mineral UV filter (Zinc Oxide/Titanium Dioxide) dispersion.
Make-up Foundations: For a smooth application and long-wear stability.
Cleansing Oils & Balms: It aids in the "emulsifying" step when rinsing with water.
Rich Night Creams: Providing intense hydration without a heavy feel.
Baby Care Products: Due to its gentle, non-irritating nature.

6. Is Polyglyceryl-2 Sesquioleate safe for sensitive skin?

Yes, it is considered non-irritating and non-sensitizing. Unlike some traditional surfactants, polyglyceryl esters maintain the skin's natural lipid balance, making them suitable for sensitive skin and baby care formulations.

7. How should Polyglyceryl-2 Sesquioleate be stored?

To maintain maximum stability and shelf life:

Store in a cool, dry place away from direct sunlight.
Keep the container tightly sealed when not in use.
Avoid exposure to extreme temperatures to prevent oxidation of the fatty acid chains.